Hostname: page-component-cd9895bd7-lnqnp Total loading time: 0 Render date: 2024-12-25T17:11:54.894Z Has data issue: false hasContentIssue false
  • English
  • Français

Diameter Measurements of Asteroids

Published online by Cambridge University Press:  12 April 2016

Audouin Dollfus
Audouin Dollfus*
Affiliation:
Observatoire de Paris

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Direct optical measurements of asteroid diameters obtained by telescopic observations are scarce. Although several adequate instrumentations and techniques are available for the purpose, they have not been used. The importance of these determinations should be stressed for the attention of observers.

The filar micrometer was used only by one observer during the last century, and no additional measures have been made since. This was in 1894 and 1895 when E. Barnard (1902) used the 90 cm refractor of Lick Observatory, and the 100 cm refractor of Yerkes Observatory. The results are as follows:

Ceres: apparent diameter at 1 AU: l˝.060, or 770 km (28 nights)

Pallas: apparent diameter at 1 AU: 0˝.675, or 490 km (5 nights)

Juno: apparent diameter at 1 AU: 0˝.266, or 195 km (5 nights)

Vesta: apparent diameter at 1 AU: 0˝.531, or 390 km (21 nights)

Type
Part I-Observations
Information
International Astronomical Union Colloquium , Volume 12: Physical Studies of Minor Planets , 1971 , pp. 25 - 31
Copyright
Copyright © NASA 1971

References

Barnard, E. 1902, On the Dimensions of the Planets and Satellites. Astron. Nachr. 157, 260–268.Google Scholar
Camichel, H. 1953, Nouvelle Méthode de Mesure des Diamètres des Petits Astres et ses Résultats. Ann. Astrophys. 16, 41.Google Scholar
Camichel, H. 1958, Erreur Systématique sur la Mesure des Diamètres des Petits Astres Avec le Micromètre a Double Image. Ann. Astrophys. 21, 217–228.Google Scholar
Camichel, H., Hugon, M., and Rösch, J. 1964, Mesure du Diamètre de Mercure par la Méthode de Hertzsprung le 7 Novembre 1960. Icarus 3, 410–422.CrossRefGoogle Scholar
Dollfus, A. 1954, L’Observation à la Tour Eiffel du Passage de Mercure Devant le Soleil Pour la Mesure de son Diamètre. L’Astronomie 68, 337–345.Google Scholar
Dollfus, A. 1963, Mesure du Diamètre de Mercure lors de son Passage Devant le Soleil le 7 Novembre 1960. Icarus 2, 219–225.CrossRefGoogle Scholar
Hamy, M. 1899, Sur la Mesure Interférentielle des Petits Diamètres. Application aux Satellites de Jupiter et à Vesta. Bull. Astron. 16, 257–274.Google Scholar
Muller, P. 1949, Sur un Nouveau Micromètre à Double Image, ses Possibilités et Quelques Questions Connexes. Bull. Astron. 14, 177–313.Google Scholar