79 HP ANDROMEDAE (UG?) Range: 10.5-19p Position: 00 19 09.2 +41 27 42 (J2000, DWS) Magnitude: unknown ID RA (2000) DEC X Y N V ERR B-V ERR a) Comparison star sequence 1 00 18 42.9 +41 31 19 -295 217 4 11.489 0.012 0.571 0.013 2 00 19 06.4 +41 28 05 -31 23 4 11.749 0.012 1.035 0.009 3 00 18 57.5 +41 28 26 -131 44 4 11.951 0.011 0.668 0.013 4 00 19 00.5 +41 29 43 -98 121 4 12.336 0.013 0.605 0.012 5 00 19 08.0 +41 32 11 -14 269 4 12.625 0.017 0.587 0.017 6 00 18 43.0 +41 27 11 -295 -31 4 13.273 0.013 0.547 0.011 7 00 19 17.1 +41 26 27 89 -75 4 13.987 0.019 0.567 0.011 8 00 18 53.7 +41 26 57 -174 -45 4 14.469 0.014 0.927 0.012 9 00 19 31.3 +41 26 06 248 -96 4 14.834 0.016 0.777 0.018 10 00 19 33.5 +41 27 59 273 17 5 15.019 0.014 0.514 0.014 11 00 19 15.3 +41 30 49 68 187 5 15.352 0.027 1.091 0.029 12 00 18 56.6 +41 27 23 -142 -20 5 15.984 0.039 0.986 0.031 13 00 19 09.2 +41 26 49 0 -53 5 17.183 0.034 0.576 0.068 14 00 19 09.7 +41 27 01 6 -41 4 18.384 0.052 0.646 0.109 b) Wide-colour extension for CCD calibration 00 19 32.3 +41 22 37 260 -305 2 13.681 0.000 0.461 0.004 00 19 22.9 +41 32 04 153 261 4 14.535 0.019 0.471 0.018 00 19 22.5 +41 29 52 149 130 5 15.991 0.029 1.214 0.015 Notes: 1. HP And has been positively seen only once, at magnitude 10.5B, on the discovery plate taken by G.A. Tickow with the Pulkova Astrograph on the night of 29 October 1915. It was not visible on three other Pulkova plates taken in 1917, 1920 and 1925. 2. The position of HP And is from the chart in the discovery announcement of Seliwanow, AN, 227, 27, 1926, and is repeated in Downes, Webbink and Shara, PASP 109, 345, 1997. However this object is a faint galaxy, measured during the sequence determination at V=18.791 and B-V=1.028, and thus it cannot be the real HP And. 3. Seliwanow also gave the following position for HP And: 00 11 26.6 +40 38.2 (1855). This position precesses to 00h 19m 03.5s +41d 26' 32" (J2000) which is almost exactly coincident with the bright star HD 1469 at 00h 19m 03.2s +41d 26" 38" (J2000). It would appear that Seliwanow measured the wrong star, as HD 1469 is the only star in the immediate vicinity with a magnitude close to the reported discovery magnitude of 10.5B. 4. A check of minor planets and comets in the vicinity on the night of 29 October 1917 reveals that there were neither in the area during that time that could have been misidentified as a variable star. Thus the reality of HP And is extremely doubtful. 5. The bright nearby star HD 1469, mentioned above, was not measured by Henden. It lies about 70 arcsec southwest of the variable. Its magnitude was measured by Skiff (IBVS 4603, 1998) as V=9.230+/-0.012 and by Tycho-2 as V=9.25+/-0.02. 6. The AAVSO preliminary 'e' chart dated July 1995 contains Skiff's magnitudes. Misselt has four stars in common to both sequences and Skiff measured three stars in common. ID Henden Misselt Skiff V V V 1 11.489 11.480 2 11.749 11.776 11.739 3 11.951 11.987 4 12.336 12.407 7 13.987 14.025 14.00 Bruce Sumner Revised 30 August 1999 Revised 30 December 2000