R. W. Argyle, Royal Greenwich Observatory, telexes that a direct exposure with the 33-cm astrograph on Apr. 12.1 UT gave the position of this object as R.A. = 20h19m01s.09, Decl. = +21o24'43".2 (equinox 1950.0; standard error of unit weight 0".37); the unfiltered B magnitude was 9.5. A 10-min objective-prism (dispersion 125 A/mm at H-alpha) exposure with the 66-cm refractor showed hydrogen in absorption. W. Liller, G. Schwartz and C. A. Whitney, Center for Astrophysics, report that spectrograms (dispersion up to 230 A/mm) were obtained with the 30-cm refractor and 155-cm reflector at Harvard's Agassiz Station on Apr. 20.3 UT. Only narrow absorption lines of H-alpha through H-delta were present, typical of a nova near maximum. The exposures were inadequate to show if the H and K lines were present. Whitney also reports photometry with the 41-cm refractor: Apr. 21.33 UT, V = 8.86, B-V = +0.39, V-R = +0.43, V-I = +0.94; 22.33, V = 8.83, B-V = +0.44, V-R = +0.45, V-I = +1.02. A late report from Y. Kozai, Tokyo Astronomical Observatory, notes that the object was independently discovered by M. Honda, Kurashiki, on an exposure using Tri-X film obtained on 1978 Aug. 21.515 UT, at which time the magnitude was 10. Visual magnitude estimates by AAVSO members suggest that the object has remained essentially constant at magnitude 8.6-8.9 for the past week.
International Astronomical Union Circular
- Pub Date:
- April 1979