[Aavso-photometry] Re: CCD Views Special Edition: Exoplanet Transit Campaign

[Michael Koppelman]

A few notes on this star.

The coordinates on the chart seem a bit off to me. This may be an error  
propagated from the GCVS? I don't know. The actual coordinates,  
according to my astrometry, are:

22:53:17.1 -14:15:52.72

This is +/- about 0.5".

I always forget which one (RA or Dec) is supposed to have the extra  
digit. I'm sure Arne will correct me!

This was completely constant in my 4 hour run last night. A weighted  
average of all 4 hours of data gives:

V = 10.222 +/- 0.001

I used all 3 stars from the E chart in an ensemble solution and the  
zeropoint error was 0.01 or less. I guess this means it would be more  
accurate to say it was at V = 10.22 +/- 0.01. It appears that the  
magnitude for the 11.9 star includes the companion 17" away at position  
angle 329.2. If the sequence is from ASAS this makes sense.

I have submitted my data to the AAVSO.

Cheers,
Michael Koppelman
http://www.lolife.com/astronomy/



On Oct 7, 2004, at 11:09 AM, aavso at aavso.org wrote:

> ----------------------------------------------------------------------- 
> ---
>             THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
>                  25 Birch Street, Cambridge, MA 02138 USA
>                  Tel. 617-354-0484       Fax 617-354-0665
>                           http://www.aavso.org
> ----------------------------------------------------------------------- 
> ---
>
>                              C C D   V I E W S   #326
>                             --------------------------
>                                  October 7, 2004
>
>  !! THIS IS A SPECIAL EDITION OF CCD VIEWS !!
>
> Table of Contents
>  -----------------
>  1. Exoplanet Transit Campaign for IL Aqr/GJ 867
>
> ----------------------------------------------------------------------- 
> ---
>  1. EXOPLANET TRANSIT CAMPAIGN FOR IL AQR/GJ 867
>
>  The AAVSO has teamed up with transitsearch.org to coordinate an  
> observing
> campaign for IL Aqr, a.k.a GJ 867 in the transit search community. Dr.
> Greg Laughlin, University of California at Santa Cruz, is looking for
> observations during an upcoming transit opportunity.
>  IL Aqr is located at R.A.: 22:53:17  Decl.: -14:15:48
>