Original: 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.
Simplified: David W. Dunham, The Minor Planet Bulletin, Volume 6, p.13-14 (December 1978) ADS archive copy However, careful studying in 1993, using the Hubble Space Telescope, could not locate a moon.