Re: GSC 748-1618

[Michael Koppelman <lolife@bitstream.net>]

On Monday, December 30, 2002, at 08:41 AM, Patrick Wils wrote:

> So the variations observed by TASS are probably genuine.
> The online database has observations of a fourth night (with less
> observations), showing GSC 748-1618 essentially constant ("inactive"
> ?)near V=11.55.
> Michael, how long is your stretch of data on this star ?

I got more data last night so I have two stretches of data both about 3 
hours long. In both cases I see no variation to speak of. The first 
night I have an average of 11.44 with a standard deviation of 0.03 
(comp star standard deviation is 0.02). The second night the average is 
11.45 with a standard deviation of 0.013 (comp star standard deviation 
is 0.008). The data for the second night is better because I used 120 
second integrations vs. 30 second integrations the first night.

Presuming the TASS variation is real, the period must be very near a 
day or perhaps much longer. More data is needed.

Cheers,
Michael Koppelman