149 V1454 CYGNI (UGSS) Range: 13.9-20.5V Position: 19 53 38.38 +35 21 45.3 (J2000, from .dat file) Magnitude: V=~20.5 B-V~0.3 (at minimum) ID RA (2000) DEC X Y N V ERR B-V ERR a) Comparison star sequence 1 19 53 26.8 +35 21 58 -142 13 4 11.238 0.084 1.256 0.012 2 19 53 48.3 +35 22 00 121 15 3 11.643 0.074 1.176 0.031 3 19 53 30.6 +35 23 20 -96 95 3 11.969 0.049 0.339 0.048 4 19 53 40.8 +35 21 38 29 -7 3 12.271 0.028 0.457 0.021 5 19 53 35.4 +35 20 09 -36 -96 3 12.595 0.005 1.142 0.004 6 19 53 37.6 +35 22 05 -9 20 3 13.113 0.005 0.704 0.011 7 19 53 51.5 +35 21 43 160 -2 3 13.684 0.009 0.439 0.007 8 19 53 37.1 +35 21 05 -16 -40 3 14.358 0.005 0.554 0.011 9 19 53 37.8 +35 20 50 -7 -55 3 14.594 0.000 0.808 0.005 10 19 53 29.2 +35 21 53 -112 8 3 15.169 0.006 0.821 0.014 11 19 53 39.2 +35 22 34 10 49 3 15.458 0.000 0.821 0.008 12 19 53 38.1 +35 22 23 -4 38 3 15.816 0.009 0.865 0.009 13 19 53 39.1 +35 21 19 9 -26 3 16.283 0.011 0.912 0.011 14 19 53 39.1 +35 21 35 9 -10 4 16.825 0.062 0.854 0.070 15 19 53 38.2 +35 21 45 -2 0 3 17.181 0.013 0.869 0.005 16 19 53 39.1 +35 21 45 8 0 3 17.574 0.017 0.952 0.026 17 19 53 37.4 +35 21 46 -12 1 3 18.417 0.033 1.012 0.123 18 19 53 38.4 +35 21 52 0 7 2 20.427 0.391 0.870 0.226 b) Wide-colour extension for CCD calibration 19 54 00.2 +35 18 16 267 -209 3 14.198 0.006 0.333 0.011 19 53 47.0 +35 25 06 105 201 3 12.081 0.033 0.356 0.037 19 53 52.5 +35 19 35 173 -130 3 14.870 0.011 2.081 0.011 19 54 03.5 +35 27 48 306 363 3 15.256 0.044 2.327 0.015 Notes: 1. The four brightest stars in this sequence are all saturated, and their magnitudes and colours are therefore only approximate. They should be used for guidance only until accurate magnitudes are determined. 2. At least three photographic outbursts of this variable are known (see Pinto and Romano, Padova Publication No.162, 1972 and Loser, IBVS 1661 1979). 3. V1454 Cyg was caught in outburst on POSS-II plate XJ399, exposed on 29 June 1987. Comparison of this image with an image obtained two weeks earlier when the variable is at minimum clearly shows that the variable is a close companion to star #16 in this sequence, but several magnitudes fainter. V1454 Cyg lies 3 arcsec east of this 17.2V star and is about magnitude 21B at minimum. 4. All previous identifications of this variable, including Pinto and Romano (object GR 221) and Downes, Webbink and Shara, PASP, 109, 345, 1997, have incorrectly identified the 17.2V star as the variable. 5. Star #19 at 20.4V is included only because it is very close to the variable and appears to be almost the same magnitude as V452 Cyg at minimum. Its errors are very large and its magnitude is only approximate. 6. It is noted that the range of over 6 magnitudes between maximum and minimum is very unusual for an UGSS type variable. Bruce Sumner Revised 18 September 2000 Second revision 16 February 2002