David's Astronomy Pages
Images - Session 535 (2012-12-26)

Objects Session Notes
Bullet BL Lac - Active Extragalactic Object (Blazer)
 
Bullet Photometric Monitoring - Variables
- RX And, Z And, TT Ari, CI Cyg, S Cyg, SS Cyg, BL Lac, DY Per , GK Per, 

 - U And & RR Tau attempts failed (due to cloud)

   
Bullet Astrometric Monitoring - Nearby Stars
- None
- Late Evening session (3.3 hrs duration). 
- Session operated under semi-automated control, with remote monitoring from indoors computer.  
1 hour break in middle due to cloud cover.
- Ambient Temperature: Initially dropping from +2.0°C down to -2.5°C, before rapidly climbing  to 0°
- CCD operation -30°C (at 64% average cooling).  
- main objectives of the session were to acquire images of selected project stars for ongoing photometric and astrometric analysis. 

Attempts to image 3 comets where unsuccessful due to poor sky transparency.
-

BL Lac - Active Extragalactic Object (Blazer)

BL Lac (Lacerta)
BL Lac variable : red cross-hairs
comparison & check stars  : yellow cross-hairs

Image



BL Lac :  +14.83 (R)

Annotated CCD Image (cropped)
2 x 60 sec exposure (average combine), 
3x3 binning, R Filter
2012-12-26 20:04hUT (#535103-04)
12" LX200R  (at f/9.7) + ST-10XME

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