See data from DS23 at http://stupendous.rit.edu/tass/data/ds23/gsc_00763-00572.dat
John Greaves:
Although the colour is _just_ a little red (around BT-VT 0.6 according to Tycho) and the period near the longish side of the range, Star 61620 in collected.big on TASS data CD 23 (GSC 0763 0572) appears to be either a field SX Pheonix variable or a delta Scutid variable of V 10.6 to 11.1 range in 0.173 days. The light curve is fairly symmetric and ever so slightly variable in amplitude, especially around minimum. It is not listed in either the latest online GCVS (includes all namelists to date), the NSV or the NSV supplement, nor in a plethora of unofficial to quasi-official amateur and/or professional survey lists. The period could do with some refinement, but plots as a phase diagram quite well with the four nights together providing half to two thirds of a full cycle. Should be confirmable in one nights run come winter's return. (NB Welch-Stetson Statistic was 56)
Doug Welch
Nice catch! It is definitely a short-period beast and you may have the correct period. Note however that 0.3511 days also phases it pretty nicely but it would have to be a close eclipsing binary for the longer period.
John Greaves
In the group of individual stars of interest, GSC 00763-00572 was reported as being of suspect variability by Bernhard in February 2002, being BhrV103 in his list. For this one he has one long run covering around half of one cycle just a couple of nights before Tom's _last_ night of measures for it.