257 CR BOOTIS (AM) Range: 13.0-<17.5V Position: 13 48 55.24 +07 57 36.2 (J2000, from .dat file) Magnitude: V=14.627 B-V=-0.148 (in .dat file) ID RA (2000) DEC X Y N V ERR B-V ERR a) Comparison star sequence 1 13 49 11.5 +07 57 52 243 16 3 11.539 0.068 1.433 0.075 2 13 49 20.7 +08 00 00 379 144 3 12.077 0.014 0.449 0.006 3 13 49 11.7 +08 01 45 245 249 3 12.239 0.008 0.971 0.008 4 13 49 07.3 +08 00 11 180 155 3 13.735 0.009 1.229 0.009 5 13 49 11.4 +08 01 25 240 229 3 14.075 0.011 1.228 0.008 6 13 48 47.4 +07 52 23 -115 -313 3 15.011 0.013 0.717 0.004 7 13 49 08.0 +07 58 35 190 59 3 15.548 0.013 0.801 0.002 8 13 49 00.3 +08 01 45 75 249 3 15.745 0.006 0.489 0.009 9 13 48 47.3 +07 54 03 -118 -213 3 16.580 0.024 1.042 0.019 10 13 49 09.7 +07 54 59 215 -157 3 17.162 0.016 0.928 0.064 11 13 48 53.5 +07 59 16 -25 100 3 17.749 0.029 1.442 0.152 b) Wide-colour extension for CCD calibration None required. Notes: 1. There is a bright Tycho-2 star in this field at 13h 48m 34.7s +07d 57' 36" with a reliable magnitude of 6.81+/-0.01. 2. AAVSO preliminary chart 1344+08(e) dated July 1997 has a CCD(V) sequence from Kyoto University (Kato et. al.). Henden Kyoto ID V V 1 11.539 11.4 3 12.239 12.2 4 13.737 13.8 5 14.075 14.1 7 15.548 15.4 8 15.745 15.7 10 17.162 17.0 17.639 17.3 11 17.749 17.7 3. Star #1 is saturated and its magnitude and colour are approximate. The magnitude from Kyoto, namely V=11.4, is likely to be more accurate and should be used for visual estimates. Bruce Sumner 14 February 2002