169 V730 SAGITTARII (UGSS:) Range: 13.6-16.5p Position: 19 23 00.97 -28 29 37.4 (J2000, from .dat file) Magnitude: V=14.076 B-V=0.053 (from .dat file) ID RA (2000) DEC X Y N V ERR B-V ERR a) Comparison star sequence 1 19 23 03.6 -28 32 44 34 -187 2 11.384 0.012 0.340 0.012 2 19 23 09.6 -28 33 54 113 -257 1 12.035 0.001 0.604 0.001 3 19 22 42.0 -28 25 06 -250 271 1 12.823 0.001 0.745 0.001 4 19 23 01.9 -28 29 49 12 -12 1 13.348 0.001 0.669 0.001 5 19 23 26.6 -28 30 17 338 -40 1 13.507 0.001 0.658 0.002 6 19 23 19.6 -28 27 13 245 144 1 13.838 0.002 0.808 0.003 7 19 22 56.5 -28 29 53 -60 -16 1 14.178 0.002 0.602 0.003 8 19 23 16.7 -28 29 40 207 -3 1 14.464 0.002 0.586 0.003 9 19 22 59.6 -28 30 21 -18 -44 1 14.903 0.003 0.720 0.004 10 19 23 00.4 -28 29 52 -8 -15 1 15.064 0.003 0.489 0.005 11 19 23 08.9 -28 29 40 104 -3 1 15.480 0.004 0.730 0.006 12 19 23 04.4 -28 29 29 44 8 1 16.495 0.008 0.785 0.014 13 19 22 59.7 -28 29 41 -17 -4 1 17.572 0.024 1.228 0.066 b) Wide-colour extension for CCD calibration 19 23 24.8 -28 26 22 314 195 1 16.464 0.009 0.143 0.011 19 22 45.7 -28 29 20 -202 17 1 14.443 0.002 0.277 0.003 19 22 44.2 -28 27 20 -222 137 1 14.363 0.002 1.569 0.004 19 23 04.2 -28 34 29 42 -292 1 12.812 0.001 1.572 0.002 Notes: 1. Stars 1 and 2 are saturated and their magnitudes should be used for guidance only. Star 1 has a reliable Tycho-2 magnitude of V=10.71+/-0.08. There is another bright Tycho-2 star located on the west edge towards the south, with a magnitude of V=9.64+/-0.03 2. An examination of seven Schmidt images taken between 1954 and 1991 available at the USNO PMM archive site implies that this variable does not have a deep minimum. Most images show the variable about magnitude 15.0-15.5p, with only two images showing it as faint as magnitude 16.5p. A classification of UGSS is quite probable. Bruce Sumner 10 September 2000