Richard Knowles (see http://a188-l009.rit.edu/tass/mailarchive/2002-04/msg00037.html ):
For the past several weeks I've been working with getting Michael Richmond's pipeline up and running and doing some data reduction using disks from Tom Droege and Tom's collect_stars.pl. During this process I have came across an object which to me appears to be a variable star. I've looked at what materials I have access to via the web (Simbad and a couple other less comprehensive sources) but haven't been able to find any direct references to this object. Tom and I have discussed this and I've been waiting until I could get several data sets before saying anything. The object is at RA: 72.7925 DEC: +7.7155 degrees. I have three separate data sets which cover it and they all show Variable Star like behavior. (See attached GIF's) Please forgive the formatting. It looks like the star varies between V=10.3 to V=10.5 and back again. My guess at the period is that it is around 24hrs or so judging from the behavior I see. Is this anything new or am I just reporting wilted lettuce? Also, if anyone else has observations for this object, I'd appreciate it if they'd share.
Andrew Bennett:
It is a Tycho2 source ... I'm sorry but my code that is supposed to carry the Tycho number through to the final printout isn't working. Like much else. A plot of the data I had analysed up till that point is on my web site http://www3.ns.sympatico.ca/andrew.bennett/tass/set20/set20.html as I previously posted. I have since analysed the rest of the data so I have D2239, 2246, 2262 and 2309. At the point where I gave up work on Ensemble processing in order to prune vines, I had confirmed the variability but also had a large and mysterious shift in V - I between the first two day's data and the last two! V - I about 0.76 mags then only about 0.4 mags?!? This is clearly wrong!!! Obviously a problem in my programs. I have not had time to look into this.
John Greaves
GSC 00684-01316 is probably NSV 16176