244 SDSS1730 (UGSU) Range: 13.5v-~19.5p Position: 17 30 08.37 +62 47 54.8 (J2000, from .dat file) Magnitude: V=16.501 B-V=0.002 (in .dat file) ID RA (2000) DEC X Y N V ERR B-V ERR a) Comparison star sequence 1 17 29 42.4 +62 47 49 -179 -6 2 12.996 0.092 0.561 0.095 2 17 31 03.8 +62 47 06 380 -49 2 13.621 0.017 0.585 0.006 3 17 30 49.8 +62 52 07 283 252 2 14.344 0.011 0.676 0.005 4 17 30 23.1 +62 48 34 101 39 2 14.663 0.011 0.671 0.012 5 17 30 08.2 +62 48 54 -1 59 2 15.072 0.010 0.786 0.005 6 17 29 35.7 +62 49 41 -224 106 2 15.636 0.015 0.630 0.014 7 17 29 59.4 +62 49 09 -61 74 2 15.975 0.020 0.635 0.001 8 17 29 49.2 +62 46 24 -132 -91 2 16.715 0.008 0.691 0.013 9 17 30 03.5 +62 47 48 -34 -7 2 17.610 0.008 1.092 0.009 b) Wide-colour extension for CCD calibration 17 30 08.0 +62 53 02 -3 307 2 14.841 0.017 0.575 0.007 17 29 51.7 +62 45 12 -115 -163 2 15.666 0.011 1.456 0.002 Notes: 1. Star #1 is saturated and its magnitude and colour is approximate. It should be used with care. 2. There is a bright star 50 arcsec south of the variable, which will make visual detection of the variable very difficult. The bright star is at 17h 30m 09.0s +62d 47' 05" and has a reliable Tycho-2 magnitude of V=10.00+/-0.03. 3. A check of the 13 available DSS images shows the variable often in outburst, indicating a short outburst cycle. From the DSS images the magnitude range appears to be about 15.5p to 19.5p. However it has been seen visually as bright as 13.5v during super-outburst. 4. Two nights of photometry are available for SDSS1730, separated by four nights: V=15.428+/-0.003 B-V=-0.018+/-0.004 V=17.152+/-0.009 B-V= 0.023+/-0.011 4. The full name of this new cataclysmic variable is SDSS173008.38+624754.7. 6. Superhumps were observed on October 2001 by T. Vanmunster, vsnet- alert 6800. An approximate period of 0.0801 days was determined, showing this to be a new UGSU-type dwarf nova. Bruce Sumner 17 October 2001