New York: Kensington Books, 1998. 342p., very good first edition in boards and unclipped dj.
Second book in a series of gay mysteries with journalist detective Mark Manning. Gunn page 135. Author worked on the Chicago Tribune for unspecified length of time, hence the interesting insiderisms; and has a lifelong interest in astronomy, hence the plot: alleged discovery of a tenth planet by one Dr. Zarnick (the victim).