Astrometric observations of comets and asteroids and subsequent orbital investigations
Subtitle: semiannual progress report no. 27 for the period 1 November 1986 through 30 April 1987
By: principal investigators, Richard E. McCrosky, Brian G. Marsden.
Contributors: Marsden, Brian G.; United States. National Aeronautics and Space Administration.
Series: NASA contractor report -- NASA CR-180606.
Publisher: National Aeronautics and Space Administration; National Technical Information Service, distributor
Published: 1987
Place of publication: Washington, D.C; [Springfield, Va
Language: eng
Format: Microform
Subjects: Asteroids.; Astronomical catalogs.; Comets.; Planets.
Notes: Distributed to depository libraries in microfiche.

Microfiche. [Washington, D.C. : National Aeronautics and Space Administration, 1987] 1 microfiche.