Littlest Pet Shop Advent Calendar 2009

My first steps ... (III)

On this occasion, in order of AR increasingly have been measured in double STF 1927 Dragon STF 2277 the couple located in the constellation of Hercules (one of my favorites ...), the Lyra 2380 STF and STF end 2893 which is within the limits of Cepheo.Lo truth is that by not watching days and this session I took a little out of practice and the team descolimado as you can see from the footage, so possibly the accuracy of the measures is not to throw rockets ...
I have also changed somewhat the method used. We
series of 100 shots of each pair, which were subtracted from the corresponding Darks (100 per pair). After filtering each set, 50 images were chosen that were considered best. They were then aligned and stacked for later Autoreduc go measure them. Once steps have been taken off the list that higher theta and rho dispersion present, is at the end between 30 and 50 images of each pair measurable.
These are the steps and handholds.

-=-= STF 1927 =-=-
Date: 2009,372
353.11 (sigma theta: 0.37) Med: 353.06
16,011 (sigma rho: 0.079) Med: 16.0015 = 1.09

Deltamed

-=-= STF 2277 =-=-
Date: 2009,372
127.87 (sigma theta: 0.38) Med:
127,875 26,831 (sigma rho: 0.133) Med: 26,826
Deltamed = 2.91

-=-= STF 2380 =-=-
Date: 2009,372
8.15 (sigma theta: 0.29) Med: 8.18
25,717 (sigma rho: 0.14) Med: 25.7185
Deltamed = 2.01

-=-= STF 2893 =-=-
Date: 2009,372
347.34 (sigma theta: 0.28) Med:
347,325 28,989 (sigma rho: 0.149) Med: 28.9855
Deltamed = 2.67

Two more ... STF 485 AE

which are immersed in the beautiful open cluster NGC 1502 the Giraffe and the couple located on the 2687 STF Cygnus.

-=-= STF 485 AE =-=-
Date: 2009,379
305.25 (sigma theta: 0.21) Med: 305.25
17,919 (sigma rho: 0.088) Med: 17,915
Deltamed = 0.05

-=-= STF 2687 =-=-
Date: 2009,379
117.78 (sigma theta: 0.37) Med: 117.75
26,236 (sigma rho: 0131) Med: 26,235
Deltamed = 2.37

Continuing my work slowly but surely, to measure calibration pairs SAF measures here I leave a pair of STF 1050 with magnitudes 8.1 and 9.0 we can find in the constellation Lynx.

-=-= STF 1050 =-=-
Date: 2009.408
20.44 (sigma theta: 0.99) Med:
20,425 19,349 (sigma rho: 0.252) Med: 19,357
Deltamed = 0.83

STF The ephemeris calculated for 1050 at the time of observation are the following:

Theta Rho .............. 20.05 º
........... ..... 19.35 "

As before, the value of Theta although very near departs somewhat from that calculated for the observation date which added to a dispersion Theta measures nearly a degree (0.99 ), I'm thinking that I need to improve the calibration method camera angle, perhaps by using the Synthetic Drift ... The value of Rho, almost identical.

After three sessions of observation, the conclusions I draw are:
- it's very important right collimating the telescope.
- it's very important to improve the focus.
- What if the optical configuration is varied between sessions, the pixel scale is almost a constant ...