Water From Mouth To Urethra

Fabra Observatory (Barcelona)

Start with this post a series of reports about some of the astronomical observatories at one point or another in their history have been related to the study of double stars.

How could it be otherwise, I will start talking about Fabra Astronomical Observatory, which I've been very fortunate to have always been next to my house. Over the years, I also had the good fortune to be related to their staff because some time collaborated on a project that also works, one of the astronomers at the observatory.
"The Fabra, "as we affectionately call him in Barcelona, \u200b\u200bis located on the southeast side of the Collserola under the Tibidabo, dominating the plain of Barcelona, \u200b\u200bthe Delta del Llobregat and part of the Maresme.
Notably this semi-urban observatory, located at 415 meters coordinates 41.4184 ° N 2.1239 ° East, focuses astronomical research in the observation and measurement of double stars as well as international programs aimed at studying and monitoring asteroids.

The origin of the Fabra Observatory dates back to 1894 when the Royal Academy of Arts and Sciences of Barcelona delivered to the Barcelona project led by noted meteorologist Riba i Eduard Fontserè to build an astronomical observatory, meteorological and seismic Tibidabo. The council rejected the project, but the seed was planted.

In 1900, the Marquis de Alella, Camil Fabra i Fontanils, industrial and patron, made a significant financial contribution (about 80% of the budget) to refloat the situation and realize the project. A large plaque at the foot of the large telescope mount today reminds us of this fact.

work began in 1902 and Josep Comas Solà is responsible to amend the original project and direct the work. The building is designed by the architect Domènech Estapà and it was built in the period from 1902 to 1904. In 1904 Comas Sola was named the first director of the Observatory.

In 1912 the Academy of Sciences proposed shared management of the Observatory, with the Comas Solà i Eduard Fontserè astronomical section on the weather. Since its opening on April 7, 1904, in the presence of King Alfonso XIII and various authorities, the Observatory has been a reference to Barcelona and a scientific symbol for the city.

For any reason we must make a visist to the dome where is the refractor Mailhat, 38 cm. A long focal length refractor only in Spain and one of the largest of its features still in use. This is a double-diameter telescope, with visual and photographic lens (focal 6000mm and 409mm respectively) and is incredible ... with that special something that makes you transport to the past, imagining himself beside the Josep Comas i Sola in one night in 1908 in studying Titan , trying to prove the existence of its atmosphere.
also essential, to make an exit to the terrace of the dome, with stunning views over the city.

To give you a clearer idea of \u200b\u200bwhat I speak, here you have some photos of the last visit I could do Fabra with a group of friends and fellow fans ... Fotillo
This is a group at the entrance of the Observatory Fabra ...


Alfons Doors, a meteorologist at the observatory showing the instrument shelter Stevenson also called checkpoint.


Here an overview of the Observatory building.


With friends on the Monster Mailhat. "


Well, now comes the protagonist and his surroundings.
Some details of the "monturilla" equatorial.



And here the "light" refractor poised game.


And here a detail of the site where "you see."
To give you an idea of \u200b\u200bthe scale, black tube that looks like a search engine, is a "small" C14 ...


And here the "equipillo" to complete with the dome open. In the second picture you can even appreciate the support of astrograph photo boards attached in parallel to the main pipe.



Finally a photo "artistic" the crescent moon through the opening the dome.

you soon ...

Hemocrit Levels In Dogs

The assault of the Dragon ... (II)

I continue on this post with double measurements of the constellation Draco held on July 30, 2009 ...
Tonight was very helpful ... I got the footage to 15 sets plus two calibration stars in two hours. Which to my usual pace of work is a record time ... Data
As noted during the observation session:
A seeing of 4 / 5, the temperature between 25 º C-24, 5 º C and high relative humidity of 86%.
I roll up (because heat to a time ...) and I started to not let anyone sleep in 50-meter radius with the noise of the engines of LX200, although by 2:30 am as clouded as it was impossible to continue disturbing the rest my neighbors suffered.
Well, the first is FCS 1599, a fivefold. Introduce measures 3 of the 4 pairs.

-=-= STF 1599 AB =-=-
Date: 2009,577
164.8 (sigma theta: 0.27) Med: 164,815
9614 (sigma rho: 0.1) Med: 9.6215 = 5.17

Deltamed -=-= STF 1599 AD =-=-
Date: 2009,577
87.84 (sigma theta: 0.64) Med: 87.88
126,739 (sigma rho: 0663) Med: 126,649

Deltamed = 4.9 STF 1599 AE -=-= =-=-
Date: 2009,577
181.95 (sigma theta: 0.26 ) Med:
181,945 126,093 (sigma rho: 0695) Med: 126.1785
Deltamed = 4.85

Continuing with STFA 25, a triple system of magnitudes comfortable and spacious gaps between their components and according to the WDS was measured by last time 10 years ago.

-=-= STF A 25 AB =-=-
Date: 2009,577
296.27 (sigma theta: 0.07) Med:
179 774 296.27 (sigma rho: 0375) Med: 179,791
Deltamed = 0.48
-=-= STF A 25 AC =-=-
Date: 2009,577
224 (sigma theta: 0.09) Med:
223,985 105,044 (sigma rho: 0.189) Med: 105.0175

Deltamed = 2.93 -=- A 25 BC = STF =-=-
Date: 2009,577
150.38 (sigma theta: 0.09) Med:
150.39 178 538 (sigma rho: 0254) Med: 178.5805
Deltamed = 2.47

The following system is STT A 123.
Another triple system with a C component of magnitude 12.2 and a comfortable separation.
Here I leave it for you can enjoy the entire set.

-=-= STT A 123 AB =-=-
Date : 2009.577
146.92 (sigma theta: 0.12) Med: 69 267 146.93
(sigma rho: 0172) Med: 69,283
Deltamed = 0.01
-=-= STT A 123 AC =-=-
Date: 2009,577
128.97 ( sigma theta, 0.32) Med: 128.94
98,581 (sigma rho: 0.508) Med: 98.5955 = 4.42

Deltamed -=-= STT A 123 BC =-=-
Date: 2009,577
95.26 (sigma theta: 0.37) Med: 95.1
39,035 (sigma rho: 0.406) Med: 39,002
Deltamed = 4.23

We measure STF 2130, a couple hard to "portray".
A low magnitude of its components, which are almost equal in brightness (5.66 and 5.69), joins the lack of separation between them. So in order to unfold photographically need a good seeing and implement integration times of the order of hundredths of a second. Even so, I had to enlarge the images with QuadPix and make use of sophisticated measuring tool Surface. STF 2130

-=-= =-=-
Date: 2009,577
9.39 (sigma theta: 0.96) Med: 9
2.37 (sigma rho: 0.101) Med: 2,376
Deltamed = 0

Next the list is the trio as STF 1984 12.8 magniyud component C is in the boonies.

-=-= STF 1984 AB =-=-
Date: 2009,577
278.54 (sigma theta: 0.07) Med: 278.54
6438 (sigma rho: 0.057) Med: 6,466
Deltamed = 2.03

-=-= STF 1984 AC =-=-
Date: 2009,577
97.22 ( sigma theta, 0.24) Med:
97,245 172,436 (sigma rho: 0749) Med: 172,431
Deltamed = 5.56

I'm sure I do not imagine that the Dragon could have in their custody so many double and multiple systems ...

As I said, the Dragon is considered one of the "ugly ducklings" of the sky. And what a surprise he has given us ... The Dragon almost makes us given the amount Swan and beauty of the pairs that we offer.
The following list is STF 2146.
is a triple system confusing (or at least I think so ...)
me explain: According to the latest
WDS measurements for 1998 and 1999.
- The pair "AB" AP has a 225 and a separation of 2.7 "
- The pair" AC "presents an AP 233 and a separation of 89.2"
But seeing my shots, (which of course can show misidentified pairs) can see that having a partner, is what is considered the "C" and I would correspond to "B". Moreover, both the AP and the separation for this pair to give my measurements, coincide with what would be the steps to "AC" that gives us the WDS.
In short, if the problem is that I have not identified either the pair (although it would happen, that in a small area of \u200b\u200bthe sky so find another couple with similar actions) or actually what you are confused are points that determine the components of the system ...
there anyway I leave the photo, my proposed measures and identification of components.

-=-= STF 2146 AB? BC? =-=-
Date: 2009.577
221.93 (sigma theta: 0.6) Med: 222,065
2.654 (sigma rho: 0.038) Med: 2,647
Deltamed = 3.19
-=-= STF 2146 BC? AB? =-=-
Date: 2009.577
233.37 (sigma theta: 0.07) Med: 88 851 233.38
(sigma rho: 0.107) Med: 88.8605 = 0.04
Deltamed

Next victim, STF 2078 - STFA 30. Another system that gets it done! Indeed
are two systems that share components. Struve is seen that in reviewing the system expanded its catalog STF 2078, adding the components C and D "but keeping the measure to" A and B "to the original description of why the system has STFA 30 no measure for pair "AB". Another question comes to me with this system, namely with AP 18 ° which indicates the WDS for the pair "BC", as my shots and measures, there is a gap of about 180. "This difference may be because to the extent of" BC "is exchange the components? Or maybe I did not correctly identified?. We will have to check ...

-=-= STF 2078 AB =-=-
Date: 2009,577
105.39 (sigma theta: 0.18) Med: 105.37
2916 (sigma rho: 0.015) Med: 2,917
Deltamed = 0.98
STFA -=-= 30 BC =-=-
Date: 2009,577
193.96 (sigma theta: 0.03) Med: 90 638 193.95
(sigma rho: 0.036) Med: 90,639
Deltamed = 0.16 STFA -=-=
30 AC =-=-
Date: 2009,577
193.66 (sigma theta: 0.11) Med: 90 599 193.68
(sigma rho: 0.087) Med: 90,607
Deltamed = 0.14
-=-= 30 CD =-=- STFA
Date: 2009,577
122.94 (sigma theta: 0.23) Med:
122.94 124 779 (sigma rho: 0672) Med: 124.69
Deltamed = 5.98

The truth is that it complicadillo encouraged to get all family members in systems whose main components are together and are bright and the rest are of higher magnitudes. Trying not to overwhelm the first, we see the latter. The trick as you know, add many shots with little time for integration and the more daring, combined with other short shots long exposure. The following is

STTA 200 or 65 Drac 20h 02m 20.1sy AR Dec. +64 ° 38 '03 ". This is another system consisting of three components. The pair "Aa" to the 11.9 magnitude secondary has only been measured in 1905 and 1960. 27,025 current separation is more consistent with the 1905 (26.7 ") than with the most recent in 1960 (32.2 ").¿¿¿¿¿?????

-=-= STTA 200 Aa =-=-
Date: 2009,577
190.01 (sigma theta: 0.36) Med: 189.99
27,025 (sigma rho: 0.299) Med: 27.01
Deltamed = 3.71
-=-= STTA 200 AB =-=-
Date: 2009,577
333 (sigma theta: 0.03) Med: 333 99 149
(sigma rho: 0.067) Med: 99,165
Deltamed = 0.19

STF 2573. Normalito another pair.

-=-= STF 2573 =-=-
Date: 2009,577
6.27 (sigma theta: 0.17) Med: 27.61
18,257 (sigma rho: 0.095) Med: 18.2535 = 0.11
Deltamed

The next STF A 44.

-=-= STFA 44 =-=-
Date: 2009,577
286.63 (sigma theta: 0.07) Med: 286.62
75,342 (sigma rho: 0103) Med: 75,318
Deltamed = 0.01

few more of the same session ... STT 316

a couple of components rather weak ...

-=-= STT 316 =-=-
Date: 2009,577
348.45 (sigma theta: 0.14) Med: 348.45
47,281 (sigma rho: 0.125) Med: 47,254
Deltamed = 0.56

STTA 151, another triple system with components of high magnitude, so much so that for the pair "Bb", only measured on 2 occasions, has not yet reported the magnitude of the component "b". According to the images, I think that may be around the 13.5 -14.0. STTA -=-=

=-=-
AB 151 Date: 2009,577
171.12 (sigma theta: 0.05) Med: 171.11
87,318 (sigma rho: 0.084) Med: 87.32

Deltamed = 0.17 -=- STTA 151 Bb = =-=-
Date: 2009,577
356.08 (sigma theta: 0.51) Med: 356.24
21,976 (sigma rho: 0359) Med: 22,095
Deltamed = 2.7

And here friends, whether he gave this fantastic and productive session.

Whaat Does The Whit Dot

The assault of the Dragon ... (I)

This time I present measures STFA 35, 2225 with shots taken STF during night of May 18, 2009. That night I went a little to get the usual script of pairs of calibration steps and jumped into the pool getting some shots of a pair of doubles in the constellation Draco, which is one of those constellations that nobody pays attention to them and yet they are my favorite.
As always used the LX200R 10 "f/10 with QHY-5 mono primary focus equipped with a filter Baader IR-UV Block. Turbulence during the session was moderate, the temperature between the beginning and end of the session varied from 18 ° C to 17.3 º C at the end of it. The relative humidity has increased from 74% initially to 90% at the end of the night.
The method employed was to carry out series of 100 shots in each pair, to which they have been applied to their corresponding Darks (100 per pair). After filtering each series, I chose the 50 images I've seen better. Then have been aligned and stacked to later Autoreduc measure them. Once steps have been taken off the list that higher theta and rho dispersion present, is at the end between 40 and 50 images of each pair measurable.
As calibration torque was used twice STF 1603 with theta and rho values \u200b\u200bof 83.21 ° / 22.31 "and we can find in the nearby Ursa Major. STFA

35 also called BD +55 1945 or Nu Draconis, or Kuma, masterfully defined by Rafa in the thread "Two double easy: Arrakis and Kuma" , is a pair that has a position angle of 312 ° and a comfortable separation of 62.6 "for 2005 with components of magnitudes 4.87 and 4.90. Its spectral classes are A4m and A6v respectively.
My measurements for this pair are:

-=-= STF A 35 =-=-
Date: 2009.379
308.1 (sigma theta: 0.1) Med: 308.12
62,137 (sigma rho: 0.101) Med : 62.1135 = 0.01
Deltamed

At the same meeting also photographed observation their multiple STF 2225 to measure all the angles and separation of its components. In this case, perhaps we could speak of a "double double" because these are two pairs with magnitudes of 9.0 and 10.20 joint separated by the not inconsiderable distance of 230.4 "and a position angle of 245 ° as measured by 1991.
The first pair, STF 2225AB (BD +52 2097) presents a difference of 2.2 magnitudes between its components, being the main component of magnitude 8.7 and spectral type K2. The angle was measured for 2006 of 358 º and separation 5.5 ". The pair STF
2225CD (BD +51 2251) with magnitudes and spectral types 10.20-10.56 G5 and K8, presented in 2006 Theta value to 318 º and separation 8.8 ".
At least this is a strange system in which the pairs AB and CD are approaching each other, while components do between them, so that in future we might get to meet a dual display where there are now a multiple system .... Who knows?

These are my steps to this system.

-=-= STF 2225 AB =-=-
Date: 2009.379
339.52 (sigma theta: 0.45) Med: 5256
339.6 (sigma rho: 0.045) Med: 5,257
Deltamed = 3.28
-=-= STF 2225 AC =-=-
Date: 2009.379
242.08 (sigma theta : 0.01) Med:
229 436 242.08 (sigma rho: 0.04) Med: 229,447
Deltamed = 1.66
-=-= STF 2225 CD =-=-
Date: 2009.379
295.43 (sigma theta: 0.93) Med : 295.51
8681 (sigma rho: 0127) Med: 8,688
Deltamed = 0.48

And for the record that this is just the appetizer ...

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Forgotten Doubles Doubles in

Continuing my obsessively double measure of the Corona Borealis, I have the great pleasure to confirm you the identification of two pairs "neglected", measured in the evening session of July 11, 2009.
Once again I enjoyed a near perfect atmospheric stability. Temperature, more than pleasant, it has remained in the 24.5 º C from the beginning to the end of the session, the relative humidity fairly high as almost always happens in Barcelona because of its proximity to the sea, has fluctuated between 74% and 77 %...¡¡ dew shield Luck! ... and that is that I refuse to use trace heating, especially in summer.
has worked with SC LX200R 10 "f/10 with QHY-5 mono, equipped with a filter Baader IR-UV Block, a primary focus. Due to the convenient separation of the components and the quality of the images, for the reduction has been used Autoreduc function. Comment
that AB 1166 HU 190 BC and belong to FOX one triple system with an M-class red primary with secondary magnitude magnitudes 8.7 and 13.4 and 12.2. HU
AB 1166 was discovered in 1905 by WJ Hussey and has been measured on three occasions, the last in 1919. According to my measurements, since then the AP has changed nothing more and nothing less than 8.3 ° separating its components about 1 ". In 1916 P. Fox added to the system component C, measured only in detection and confirmed ... Nothing more and nothing less that 93 years later!. Since then according to my measures, has significantly reduced values \u200b\u200bof Theta and Rho.
No, if you get bored with the double, I doubt that we can bore ... It's so hard to close a topic ... always there is something to check. Well let me
and roll and I will put the data.

-=-= HU 1166 AB =-=-
Date: 2009,525
139.29 (sigma theta: 0.54) Med: 139,275
4866 (sigma rho: 0183) Med: 4.8585 = 6.3

Deltamed

-=-= FOX 190 BC =-=-
Date: 2009,525
271.62 (sigma theta: 0.42) Med: 271.6
59.66 (sigma rho: 0392) Med: 59,668
Deltamed = 6.6

Well, this is what you get for now, but do not hesitate to be more.

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CrB CrB ... (III) Doubles

Here you have a few more pairs, "Stolen" the Corona Borealis in the night of July 5, 2009.
On this night the atmospheric stability has hovered minimum, so even I dared to measure a double with a separation less than 3 ". ... And without the use of Barlowx2! .... The truth is that it is much more comfortable when taking the pictures, though it complicates the processing of the shots because even with a low turbulence, the resolution is not the same.
temperature between the beginning and end of the session has varied from 24.4 º C to 23.4 º C, relative humidity has ranged from 64% initially and 70% by the end of it. A very slight breeze accompanied me during all night, which despite the excellent seeing maybe some stability has reduced to images.
I have worked with the usual equipment, consisting of a SC LX200R 10 "f/10 QHY-5 but the monkey primary focus and equipped with a Baader IR-UV filter
Block
As a curiosity, note that on this occasion pairs "star" are:

- STT 305AB which, being almost twin STT 304AB, has half their separation. Which makes something more measurement, despite the difference in magnitudes between its components is almost identical.
- HU 1275 a couple whose last measure left dates from 1965 (not yet had born a few of us ...) and its separation of less than 3 "has been begging. Perhaps then try to refine its measures but, when they "target hand" to which I remain to be measured with separations less than 3 ". As I have used calibration pairs 1927/STF 2277/STF STF 2380.

I said, here are action shots and a few "victims" more.

-=-= STT 304 AB =-=-
Date: 2009.508
172.48 (sigma theta: 0.25) Med: 10.57 172.51
(sigma rho: 0.094) Med: 10,585
Deltamed = 3.55

-=-= AG 200 =-=-
Date: 2009.508
216.13 (sigma theta: 0.73) Med: 216.05
3037 (sigma rho: 0.025) Med: 3.0405 = 0.42
Deltamed

KU 53 =-=- -=-=
Date: 2009.508
48.7 (sigma theta: 0.86) Med: 48.72
5245 (sigma rho: 0.081) Med: 5.2535 = 0.89

Deltamed

-=-= STT 305 AB =-=-
Date: 2009.508
263.81 (sigma theta: 0.66) Med: 263.91
5394 (sigma rho: 0.076) Med: 5,383

- STT 305 AC =-= =-=-
Date: 2009.544
182.94 (sigma theta: 0.57) Med: 89 408 182.99
(sigma rho: 0.406) Med: 89,426
Deltamed = 4.5

-=-= =-=-
551 HO Date: 2009.508
79.01 (sigma theta: 1.17) Med: 78,755
7007 (sigma rho: 0.159) Med: 7.0055 = 5.5

Deltamed

-=-= =-=-
ALI 369 Date: 2009.508
338.34 (sigma theta: 0.43) Med: 338.35
8239 (sigma rho: 0123) Med: 8,272
Deltamed = 0.16

-=-= =-=-
HU 1275 Date: 2009.508
173.1 (sigma theta: 0.2) Med: 173.13
2944 (sigma rho: 0155) Med: 2,858
Deltamed = 2.79

I hope you are to your liking ...

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CrB ... (II)

Here I am again ready to warm you a little head with some peers more, (this time with separations below 2) of the small but beautiful constellation Corona Borealis.
I must confess that this occasion and had to "currármelo" a little more.
And is that however good the night, that working to 6700mm focal length with a super-reduced field, has a crumb. Luckily over the years I learned to do a well aligned accurate (at the expense of many sweat and tears ...) which in addition to the familiar pointing accuracy of the LX200, 99% of the time I find the stars near the center of the chip.

still using the same equipment (except a x2 Barlow, a quite malilla) the technique used differs substantially from that used at prime focus for pairs with separations greater than 2. " On the other hand achieve results with the precision required is far more complicated than working with smaller focal lengths.
On this occasion, and in order not to dazzle the secondary with a saturated primary and try to "freeze" the effects of turbulence. The integration times were very short, ranging between 0.1 and 0.5 sec. This complicates the issue, because if QHY-5 behaves perfectly (as long as the images are properly calibrated) for exposures between 0.5 and 3 sec. When we reduce the integration time below 0.5 sec. The signal to noise ratio is very weak so it makes it difficult to isolate the stars in the images.
I think for future actions were to raise the number of images, 200 or 300 for example. Surely this way I'll get better S / N ratio and hence the final resolution of the images.

Another issue that has puzzled me is the calculating the rotation angle of the camera. If I use the usual method of calculating the rotation angle of the camera by the reduction of the images of the calibration stars, the plot thickens and gains in imprecision. So clearly I have such long focal using the Delta method of calculating matrix more suitable, is through a series or motor traffic stopped ....
On this occasion we have worked with the LX200R 10 "af/26 adapting a x2Celestron Barlow and QHY-5 mono, equipped with a filter Baader IR-UV Block. The temperature between the beginning and end of the session has varied from 23.6 º C to 23.1 º C. The relative humidity has remained around to 64% throughout the session.
The fishing method employed was to carry out series of 100 shots in each pair, to which they have been applied to their corresponding Darks (100 per pair). After filtering each series, with Best / Off (S / N), I have chosen the best images. Then have been aligned and stacked to later Autoreduc measure them in the case of STF 2004 because the final image resolution and permitted or using QuadPX and Surface features in the other cases. Of course the final number of images is much smaller steps that used to peer farther apart.
As I have used calibration pairs STF 1927 STF 2277 STF 2380, resulting in a rotation angle of the camera of 10.15 ° and a pixel scale of 0.31924 "
So that, here yo measurements and photos of a few copies of double guilty of my efforts.

-=-= STF 1932 Aa-B =-=-
Date: 2009.487
264.67 (sigma theta: 1.46) Med: 264.54
1621 (sigma rho: 0.03) Med: 1,621
Deltamed = 0.18

-=-= STF 1941 =-=-
Date: 2009.487
213.93 (sigma theta: 0.59) Med: 213.93
1529 (sigma rho: 0103) Med:
Deltamed = 0.05 1.5145

-=-= STF 2004 =-=-
Date: 2009.487
282.04 (sigma theta: 0.28) Med: 282.14
1712 (sigma rho: 0.019) Med: 1.71 = 0.65

Deltamed

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Hello friends!
not want you to think that in previous entries I have not given more details keep it to myself ...

If not ... What purpose would the creation of this blog on double stars? ...

The fact is that as me about other things sometimes make the mistake of thinking that everyone who reads what I write, it is as clear as me, so I usually do not get into the details. But I can not forget that this blog is open to anyone and that not everyone have to have double experience and therefore know how to interpret what they mean all data that is displayed next to the measures. It is true that what the doubles player, that we already have on hand, we may seem basic. For which there is "bundled" with double everything that is exposed may seem meaningless gibberish.
Although subsequent entries will go out in more detail all aspects of the methodology followed for the study of double, in this I will explain in simple (and hopefully entertaining ...) which means each of the data that you will go see in the measurements for each pair ...
My usual working methods, perform 100 passes through light sockets of each system (c'mon, what would be 100 pictures of the lifetime) plus another 50 shots Darks (or dark shots while the integration of light) to calibrate the former. Thus subtracted from the light sockets, thermal noise CCD's unfortunately all introduced in the images. Once
made the shots, the next step is to reduce (measure them) which I do whenever I can with the NR software, which we must thank the great doubles player and friend, Florent Losse. Once reduced images, the program generates data files (log), which are those that will see the different entries on measurements and whose concepts, as I said earlier, I will describe below:

for clarity from the data obtained in the measurement of the images for the couple STF 2917 AB which I also left an instant.

-=-= STF 2917 AB =-=-
Date: 2009,786
Location: Barcelona OANL
Conditions: Seeing 4 / 5 - 99%
Luna Instrument: SC 0.25 m.
f/13 Camera: QHY-5 (pixels: 5.2 x 5.2) 1.0 sec.
"/ pixel: 0.71583
Delta Matrix:
-3.86 70.8 (sigma theta: 0.38) Med: 70,935
4694 (sigma rho: 0.042) Med: 4,682

Deltamed = 0.31 Nb: 28
calibration Pairs: STF 2687 STF 2691 STF 2922.

Well folks, because here I go ...
Date: 2009.786
Location: Barcelona OANL
Conditions: Seeing 4 / 5 - 99%
Luna Instrument: SC 0.25 m.
f/13 Camera: QHY-5 (pixels: 5.2 x 5.2) 1.0 sec.
This block of data points out general information on the date they were made shots in years and fraction of year, the place of observation, the conditions of the night, the team used the camera and the size of their pixels as well as the integration time of each of the images used astrometry for that particular double.
"/ pixel: 0.71583
This concept points to the pixel scale, or whatever it is, the piece of sky covered by each pixel in the image.
This value depends on two things:
- of the focal length provides the optical configuration used and in my case is a prime focus 3200mm.
- Y pixel size in my case (QHY-5) is 5.2 x 5, 2 microns.
A longer focal length and smaller pixel size, higher resolution (or less arc seconds per pixel resolution) ... and vice versa. This value multiplied by the number of pixels between the center (photocentric) of each of the components of the pair determines the distance you are from each other in arc seconds. Delta
Matrix: -3.86
This value indicates the "clumsy" we have been aligning the X axis (horizontal) camera with blue Ecuador. Come on, which points in ° (degrees) the correction that we apply the angle measured in our images for the software to accurately place the North in them.

The two concepts above are what we usually call "calibration constants" and calculated using calibration star to theta and rho parameters well known and stable, or using software such as Astrometrica, which measure very accurately the position of all stars of a photo using precision astrometric catalogs.

70.8 (sigma theta: 0.38) Med: 70,935
parameter theta indicates the position angle of the secondary to the primary (hence that is called astrometry relative) taking as 0 degrees North and increasing the value to the East. 70.8
Here is the sum value of each of the values \u200b\u200bof theta (angle position) obtained As each image, divided by the number of images.
Come on, what would be the average!
The value of Sigma Theta: 0.38 points the standard deviation value between the total of measures. A lower value of sigma, the more reliable the measure. Med
: 70,935 indicates the median of all measurements, ie the central value of the series of measures. The closer this value is the value of the average accuracy.
4694 (sigma rho: 0.042) Med: 4,682
rho parameter indicates the angular distance between the two components (arcsec). In this case 4.694 is the distance between the components "A and B "and ... if we consider that each pixel covers an area of \u200b\u200b0.71583", then the centers of the two stars are separated in the image by 6.5 pixels. Sigma parameters rho and Med have the same interpretation that theta data.
Deltamed = 0.31
Notes the difference of magnitudes between the two components. Keep in mind that reducing gives an approximation. But yes, pretty good. In this case that as the main WDS has a magnitude of 8.28 and 8.56 secondary, its magnitude difference is 0.28 so the approach to the value that gives us Reduc 0.31 is pretty good.
Nb: 28
this figure indicates the total number of images and individual measures were used to calculate the final bill. In this case, the ultimate measure of this pair is the average of 28 individual measures. Peer
calibration : STF 2687 STF 2691 STF 2922
Shown are pairs of calibration used for that particular session and that are responsible for the determination of the "famous" calibration constants.

information I hope you find it useful .....