[Aavso-photometry] Bright star wide field CCD photometry

[Wolfgang Renz]

Hello

Has anybody ever tried to do photometry from images taken with
short FL camera lenses ?
Say 50 mm FL or even down to 8 mm (= real all-sky photometry ;-) ) ?

Has anybody ever dared to try high precesion photometry on bright
variables like gamma Cas, beta Lyr, alpha Ori, beta Per, alpha Sco,
delta Sco, alpha Tau, ... using a CCD ?

The brightest CCDV measure in the AAVSO DB I've found up to now
was by Doug West on the SRB star W ORI (5.6 mag).

The AAVSO PEP charts use comp and check stars that are often
several degrees away and several mags fainter than the variable.
To get such a wide field it would require a FL of ~ 100 mm or less
for the ST-8 or ST-10  or  ~ 50 mm or less for the ST-7.

The FOVs for the SBIG ST-10 are:
f/mm   hor/°    vert/°   diag/°  "/pix  available
   8  85.9224  64.0108  96.5576  175.00 *  photo lense
  14  56.0387  39.3076  65.3100  100.00    photo lense
  20  40.8607  28.0725  48.3235   70.00 *  photo lense
  28  29.7991  20.2493  35.5351   50.00 *  photo lense
  35  24.0330  16.2602  28.7565   40.00 *  photo lense
  50  16.9494  11.4212  20.3465   28.00 *  photo lense
  70  12.1501   8.1712  14.6082   20.00    photo lense
  85  10.0180   6.7329  12.0513   16.50    photo lense
 100   8.5213   5.7248  10.2541   14.00 *  photo lense
 105   8.1169   5.4526   9.7682   13.40    photo lense
 120   7.1051   4.7719   8.5520   11.70    photo lense
 135   6.3173   4.2422   7.6048   10.40 *  photo lense
 180   4.7401   3.1823   5.7072    7.80 *  photo lense
 200   4.2666   2.8642   5.1373    7.00    photo lense
 300   2.8451   1.9097   3.4262    4.70 *  mirror & photo lense
 400   2.1340   1.4323   2.5699    3.51 *  photo lense
 500   1.7073   1.1459   2.0561    2.81 *  mirror photo lense
1000   0.8537   0.5730   1.0281    1.40    8" f/10 SCT with f/0.50 reducer
1333   0.6404   0.4298   0.7713    1.05    8" f/10 SCT with f/0.67 reducer
2000   0.4269   0.2865   0.5141    0.70 *  8" f/10 SCT at prime focus
All data except pixel size calculated via:
http://www.mat.uc.pt/~rps/photos/angles.html
Pixel size (and plate scale) calculated via:
http://home.earthlink.net/~stanleymm/CCD_topics.html


Clear skies
  Wolfgang

-- 
Wolfgang Renz, Karlsruhe, Germany
Rz.BAV = WRe.vsnet = RWG.AAVSO