H. Kosai, Tokyo Astronomical Observatory, has informed us of the discovery in 1983 Oct. by M. Wakuda (Ryuyo, Shizuoka) of a possible nova of mag 10 on a Tri-X exposure on 1983 Feb. 19. Further exposures by Wakuda, as well as patrol films subsequently examined by M. Honda, Kurashiki, show the object fading from mag 9.5 on Feb. 13 to 11.5 on Apr. 13. The object was discovered independently in 1984 July by K. Ogura on an objective-prism plate taken on 1983 July 12 with the 0.51-m Schmidt at the Bosscha Observatory; plates on July 8 and 9 confirmed the presence of emissions of H-alpha, [O I] 636-nm and [O I]/[S III] 630-nm, as well as a weak continuum. The object was photographed in 1984 July-Aug. at mag 16 by S. Fujino and T. Tashiro, and an exposure with the Kiso Schmidt on 1984 Aug. 24 shows a faint emission-line object with H-alpha, H-beta and [O III] 501- 496-nm. It is doubtful whether the object can be seen on the Palomar Sky Survey, and it was not evident on a Bosscha exposure on 1982 July 27. Kosai has measured the position as R.A. = 18h04m43s2, Decl. = -28o49'53" (equinox 1950.0, uncertainty 5"). Further details are given in Tokyo Astron. Bull. (Second Ser.) No. 273.
International Astronomical Union Circular
- Pub Date:
- October 1985