153 CZ ORIONIS (UGSS) Range: 11.2-16.9V Position: 06 16 43.23 +15 24 11.5 (J2000, from .dat file) Magnitude: V=16.912 B-V=0.446 (Henden, single night) ID RA (2000) DEC X Y N V ERR B-V ERR a) Comparison star sequence 1 06 16 29.0 +15 28 08 -205 236 1 10.632 0.001 0.606 0.001 2 06 17 10.0 +15 20 07 387 -245 1 11.484 0.002 1.498 0.004 3 06 16 43.8 +15 21 39 9 -153 1 11.735 0.002 1.268 0.004 4 06 17 08.8 +15 24 24 370 12 1 12.115 0.002 1.209 0.004 5 06 16 39.3 +15 20 21 -57 -231 3 12.665 0.043 1.148 0.019 6 06 16 50.3 +15 28 54 103 282 3 12.808 0.012 1.313 0.008 7 06 16 31.4 +15 25 59 -171 107 3 13.421 0.008 0.575 0.003 8 06 16 36.8 +15 22 50 -93 -82 3 13.465 0.010 1.036 0.004 9 06 16 38.6 +15 24 03 -66 -9 3 13.971 0.009 0.671 0.002 10 06 16 40.4 +15 24 36 -40 24 3 14.644 0.006 0.703 0.012 11 06 16 34.1 +15 23 19 -132 -53 3 15.052 0.011 0.800 0.009 12 06 16 48.2 +15 24 16 73 4 3 15.363 0.006 0.821 0.010 13 06 16 48.4 +15 25 27 75 75 3 15.670 0.006 0.943 0.010 14 06 16 51.5 +15 24 29 120 17 3 15.987 0.016 0.992 0.014 15 06 16 41.8 +15 24 26 -20 14 3 16.348 0.011 0.948 0.011 16 06 16 42.2 +15 23 45 -14 -27 3 17.161 0.011 1.047 0.102 b) Wide-colour extension for CCD calibration 06 16 34.6 +15 19 27 -124 -285 2 15.128 0.016 0.502 0.006 06 16 19.9 +15 23 48 -337 -24 2 14.716 0.011 0.548 0.001 06 17 00.0 +15 28 39 243 267 4 14.885 0.013 2.094 0.020 06 16 23.0 +15 23 47 -292 -25 3 14.027 0.013 2.214 0.019 Notes: 1. The four brightest stars in this sequence are from a single short exposure CCD image, with errors estimated to be +/-0.02 mag. 2. There is a bright Tycho-2 star at 06h 16m 13.0s +15d 29' 52" with a magnitude of 8.75+/-0.02. 3. There as an AAVSO 'e' chart dated 04/92 which contains a photoelectic sequence. The following stars are common to both sequences. ID AAVSO Henden Misselt Baily&Howarth Tycho-2 V V B-V V B-V V B-V V 1 106 10.632 0.606 A 10.59 0.66 10.69 B 10.76 0.30 112 C 11.10 1.58 2 117 11.484 1.498 3 11.735 1.268 11.775 1.255 D 11.72 1.25 4 122 12.115 1.209 E 12.11 1.22 5 126 12.665 1.148 F 12.62 1.10 129 12.716 1.615 G 12.69 1.62 6 128 12.808 1.313 133 13.363 0.762 7 134 13.421 0.575 8 133 13.465 1.036 13.516 1.025 H 13.47 1.00 9 139 13.971 0.671 14.026 0.653 K 14.02 0.58 14.189 0.679 L 14.12 0.67 10 144 14.644 0.703 14.688 0.697 M 14.62 0.80 11 147 15.052 0.800 N 14.85 0.98 150 15.160 0.742 12 15.363 0.821 15.439 0.803 5. CZ Ori varies at minimum between about V=16.3 and V=16.9. Bruce Sumner 15 November 1999 Revised 15 April 2002