David W. Dunham, The Minor Planet Bulletin, Volume 6, p. 13 - 14 (December 1978) ADS archive copy However, careful examination in 1993, using the Hubble Space Telescope, failed to locate a secondary.
David W. Dunham published in The Minor Planet Bulletin, Volume 6, p. 13 - 14  on December 1978. After careful examination with the Hubble Space Telescope in 1993 a secondary was not found.