108 TU CRATERIS (UGSU) Range: 12.1-18.3V Position: 11 03 36.61 -21 37 45.7 (J2000, from .dat file) Magnitude: V=18.280 B-V=0.104 (Henden, single night) ID RA (2000) DEC X Y N V ERR B-V ERR a) Comparison star sequence 1 11 03 36.7 -21 34 20 1 206 1 9.463 0.001 1.007 0.001 2 11 03 26.6 -21 38 24 -139 -38 2 10.044 0.038 0.635 0.035 3 11 03 39.3 -21 44 01 37 -374 1 10.800 0.001 0.403 0.001 4 11 03 15.1 -21 39 20 -300 -94 4 11.444 0.014 0.656 0.012 5 11 02 57.8 -21 47 01 -540 -555 1 12.063 0.002 0.608 0.003 6 11 02 55.5 -21 43 44 -573 -358 1 12.533 0.002 0.634 0.003 7 11 02 49.1 -21 34 43 -663 183 1 12.936 0.003 1.018 0.005 8 11 03 22.4 -21 46 34 -198 -528 1 13.518 0.003 0.883 0.005 9 11 03 02.0 -21 37 58 -482 -12 2 13.649 0.006 0.598 0.006 10 11 03 50.1 -21 35 01 189 165 4 14.126 0.011 0.960 0.011 11 11 03 16.4 -21 34 32 -282 194 5 14.467 0.018 0.677 0.002 12 11 03 19.4 -21 39 48 -239 -122 6 14.794 0.019 0.551 0.011 13 11 03 42.0 -21 36 27 75 79 4 15.349 0.014 0.702 0.010 14 11 03 37.7 -21 35 44 16 122 4 15.647 0.014 0.631 0.008 15 11 03 42.2 -21 37 36 78 10 4 16.085 0.000 1.042 0.013 16 11 03 32.2 -21 37 25 -61 21 4 17.235 0.051 1.217 0.060 17 11 03 46.3 -21 39 27 136 -101 4 17.715 0.020 0.893 0.031 b) Wide-colour extension for CCD calibration 11 03 23.4 -21 43 17 -184 -331 1 14.619 0.007 0.582 0.010 11 03 50.0 -21 34 05 187 221 4 15.219 0.013 0.617 0.013 11 03 10.5 -21 41 37 -364 -230 1 14.504 0.006 1.349 0.013 11 03 17.5 -21 37 08 -266 38 4 16.266 0.000 1.459 0.034 Notes: 1. The first eight stars in this sequence, many of them measured on only a single night, were all measured from short exposure images and are expected to be accurate to +/-0.02 magnitude. 2. Stars #1 and #2 have reliable Tycho-2 magnitudes, with star #1 having V=9.10+/-0.03 and star #2 having V=10.02+/-0.06. Star #1 is possibly even still saturated on the short 15 second exposure used here, so it would be best to use the Tycho-2 magnitude for this star. 3. There is a VSS RASNZ chart available, No. 1131 dated 1995, with comparison star letters. Five RASNZ lettered star, 'd', 'f', 'g', 'o' and p are not used in this sequence, and 'k' was not measured. ID Henden RASNZ V B-V 1 9.756 0.997 a 2 10.348 0.578 b 3 10.800 0.403 c 10.976 0.424 d 11.250 1.150 f 4 11.474 0.639 e 12.157 1.129 g 6 12.533 0.634 h 8 13.518 0.883 m 9 13.649 0.598 l 10 14.126 0.960 n 14.884 0.685 o 15.126 0.956 p 13 15.349 0.702 q Bruce Sumner Revised 31 July 1999 Second revision 18 April 2001