4957 Brucemurray
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4957 Brucemurray, provisional designation Template:Mp, is a stony asteroid, classified as near-Earth object of the Amor group and as Mars-crosser, approximately 3 kilometers in diameter. It was discovered by American astronomer Eleanor Helin at the Palomar Observatory in California on 15 December 1990.[1] The asteroid was named after American planetary scientist Bruce C. Murray.[2]
Orbit and classification
Brucemurray orbits the Sun at a distance of 1.2–1.9 AU once every 1 years and 12 months (715 days). Its orbit has an eccentricity of 0.22 and an inclination of 35° with respect to the ecliptic.[3]
The body's observation arc begins with a precovery taken at the Australian Siding Spring Observatory in March 1976, or more than 14 years prior to its official discovery observation.[1]
Close approaches
This deep Mars-crosser makes close approaches both to Earth and Mars. It has an Earth minimum orbital intersection distance of Script error: No such module "convert". which corresponds to 165.9 lunar distances. On 18 May 2033, the asteroid will also pass Script error: No such module "convert". from Mars.[3]
Physical characteristics
In the SMASS classification, Brucemurray is a stony S-type asteroid.[3] BVRIZ photometry also found that the asteroid is an S-type NEO.[4]
Rotation period and axis
In the 1990s, two rotational lightcurves of Brucemurray were obtained from photometric observations by Czech astronomer Petr Pravec at Ondřejov Observatory. Lightcurve analysis gave a rotation period of 2.892 hours in both cases with a brightness variation of 0.28 and 0.36 magnitude, respectively (U=2/3Script error: No such module "Check for unknown parameters".).[5][6]
In 2004, an international study modeled a lightcurve with a concurring period of 2.8922 hours and found a spin axis of (358.0°, −50.0°) in ecliptic coordinates (λ, β) (Q=3-Script error: No such module "Check for unknown parameters".).[7]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of Wide-field Infrared Survey Explorer and the ExploreNEOs survey using the Spitzer Space Telescope, Brucemurray measures between 3.01 and 3.499 kilometers in diameter and its surface has an albedo between 0.132 and 0.18.[8][9][10][11]
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 3.11 kilometers based on an absolute magnitude of 14.9.[12]
Naming
This minor planet was named after American planetary scientist Bruce C. Murray (1931–2013), director of the Jet Propulsion Laboratory, co-founder of The Planetary Society and professor at California Institute of Technology. This asteroid which comes close both to Mars and Earth, is considered a particularly appropriate object for Murray, who had diligently championed a mission to Mars.[2]
The official naming citation was published by the Minor Planet Center on 29 November 1993 (M.P.C. 22829Script error: No such module "Check for unknown parameters".).[13]
References
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External links
- Asteroid Lightcurve Database (LCDB), query form (info Script error: No such module "webarchive".)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Template:NeoDys
- Template:ESA-SSA
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
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