1989 May 12 (meeting)
1989 May 12 meeting of the Royal Astronomical Society
1989 N 1
1989 N 1.
1989 N 1.
1989 NA
1989 NA
1989 NA
1989 November 10 (meeting)
1989 November 10 meeting of the Royal Astronomical Society
1989 OB
1989 OB
1989 OB
1989 OB
1989 OB
1989 October 13 (meeting)
1989 October 13 meeting of the Royal Astronomical Society
1989 outburst from A1744-361
1989 P/Brorsen-Metcalf, la cometa dell'estate.
1989 PB