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 ...