Speckle interferometry of asteroids. I. 433 eros

J. D. Drummond, W. J. Cocke, E. K. Hege, Peter A Strittmatter, J. V. Lambert

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Analytic expressions for the semimajor and semiminor axes and an orientation angle of the ellipse projected by a triaxial ellipsoid (an asteroid) and of the ellipse segment cast by a terminator across the ellipsoid as functions of the dimensions and pole of the body and the asterocenteric position of the Earth and Sun are derived. Applying these formulae to observations of the Earth-approaching asteroid 433 Eros obtained with the speckle interferometry system of Steward Observatory on December 17-18, 1981, and January 17-18, 1982, the following dimensions are derived: (40.5 ± 3.1 km) × (14.5 ± 2.3 km) × (14.1 ± 2.4 km) Eros' north pole is found to lie within 14° of RA = 0h16m Dec. = +43° (ecliptic longitude 23°, latitude +37°). Other than knowing the rotation period of Eros, these results are completely independent of any other data, and in the main confirm the results obtained in the 1974-1975 apparition by other methods. These dimensions, together with a lightcurve from December 18, 1981, lead to a geometric albedo of 0.156 ± 0.010. A series of two-dimensional power spectra and autocorrelation functions of the resolved asteroid clearly show it spinning in space.

Original languageEnglish (US)
Pages (from-to)132-151
Number of pages20
JournalIcarus
Volume61
Issue number1
DOIs
StatePublished - 1985

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speckle interferometry
speckle
asteroids
interferometry
asteroid
ellipse
ellipses
ellipsoids
poles
ecliptic
longitude
albedo
autocorrelation
metal spinning
power spectra
casts
observatories
sun
observatory

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Drummond, J. D., Cocke, W. J., Hege, E. K., Strittmatter, P. A., & Lambert, J. V. (1985). Speckle interferometry of asteroids. I. 433 eros. Icarus, 61(1), 132-151. https://doi.org/10.1016/0019-1035(85)90160-5

Speckle interferometry of asteroids. I. 433 eros. / Drummond, J. D.; Cocke, W. J.; Hege, E. K.; Strittmatter, Peter A; Lambert, J. V.

In: Icarus, Vol. 61, No. 1, 1985, p. 132-151.

Research output: Contribution to journalArticle

Drummond, JD, Cocke, WJ, Hege, EK, Strittmatter, PA & Lambert, JV 1985, 'Speckle interferometry of asteroids. I. 433 eros', Icarus, vol. 61, no. 1, pp. 132-151. https://doi.org/10.1016/0019-1035(85)90160-5
Drummond, J. D. ; Cocke, W. J. ; Hege, E. K. ; Strittmatter, Peter A ; Lambert, J. V. / Speckle interferometry of asteroids. I. 433 eros. In: Icarus. 1985 ; Vol. 61, No. 1. pp. 132-151.
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