152 CN ORIONIS (UGSS) Range: 11.0-15.8V Position: 05 52 07.78 -05 25 00.3 (J2000, from .dat file) Magnitude: V=14.300 B-V=0.159 (Henden, single night) ID RA (2000) DEC X Y N V ERR B-V ERR a) Comparison star sequence 1 05 52 10.5 -05 30 02 40 -302 1 9.849 0.001 0.474 0.001 2 05 51 58.1 -05 21 08 -145 232 3 10.773 0.154 1.150 0.141 3 05 52 31.3 -05 28 31 351 -211 1 11.310 0.002 0.509 0.003 4 05 52 38.9 -05 31 09 464 -369 1 11.898 0.002 1.537 0.004 5 05 52 10.7 -05 26 56 44 -116 1 12.509 0.003 0.445 0.004 6 05 51 57.0 -05 27 40 -162 -159 3 12.998 0.006 1.240 0.009 7 05 52 21.5 -05 26 20 204 -80 4 13.652 0.006 1.288 0.009 8 05 52 18.5 -05 24 10 160 50 4 13.905 0.006 0.989 0.004 9 05 52 12.1 -05 25 21 64 -21 4 14.204 0.009 1.260 0.010 10 05 52 04.0 -05 25 40 -56 -40 3 14.645 0.005 1.324 0.007 11 05 52 27.3 -05 26 38 291 -98 3 14.850 0.009 0.880 0.009 12 05 52 00.0 -05 26 42 -117 -102 3 15.143 0.009 1.047 0.005 13 05 52 13.1 -05 28 25 79 -205 3 15.586 0.014 0.940 0.011 14 05 51 52.9 -05 27 11 -223 -131 3 15.834 0.009 0.843 0.011 15 05 51 47.0 -05 26 56 -311 -116 2 15.997 0.015 0.918 0.012 16 05 52 13.2 -05 25 44 80 -44 3 16.331 0.009 0.848 0.009 17 05 52 07.9 -05 25 22 1 -22 3 17.192 0.067 0.977 0.040 b) Wide-colour extension for CCD calibration 05 52 00.4 -05 19 21 -110 339 3 16.016 0.006 1.522 0.018 05 52 22.6 -05 19 18 220 342 3 16.375 0.016 1.522 0.004 05 52 19.7 -05 32 37 178 -457 1 12.010 0.002 1.648 0.004 Notes: 1. Stars #1, #3, #4, #5, #6 and #7 are from a single night short exposure CCD image, and their errors are estimated to be +/-0.02 mag. 2. Star #2 is saturated, and its magnitude and color are approximate. It has a semi-accurate Tycho-2 magnitude of V=10.55+/-0.07. Using the fact that Bailey and Howarth magnitudes are about 0.11 too bright in V gives a better value of V=10.63. 3. There as an AAVSO 'e' chart dated 04/92 which contains a sequence. The following stars are common to both sequences. Note that the AAVSO sequence is about 1 magnitude too bright at the faint end of the sequence. ID AAVSO Henden Misselt Bailey & Howarth Tycho-2 V V B-V V B-V V B-V V 1 99 9.849 0.474 9.84 2 106 10.773 1.150 A 10.52 1.24 10.55 3 112 11.310 0.509 B 11.20 0.46 4 119 11.898 1.537 C 11.79 1.55 122 12.010 1.648 D 11.98 1.62 5 12.509 0.445 12.483 0.453 126 12.573 0.685 E 12.45 0.64 7 133 13.652 1.288 G 13.57 1.41 13.837 0.780 F 13.73 0.74 136 13.927 1.423 13.929 1.434 H 13.83 1.53 9 138 14.204 1.260 14.212 1.291 K 14.12 1.25 10 140 14.645 1.324 14.666 1.328 L 14.68 1.07 12 15.143 1.047 M 15.13 0.98 13 146 15.586 0.940 4. CN Ori has been measured as faint as V=15.77 at minimum (Bruch 1994, A&AS, 104, 79). Bruce Sumner 15 November 1999 Revised 15 April 2002