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F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
4957 Brucemurray , provisional designation 1990 XJ , 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.[3] Bruce C. Murray .[2]
Orbit and classification
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Brucemurray orbits the Sun at a distance of 1.2–1.9 AU eccentricity of 0.22 and an inclination of 35° with respect to the ecliptic .[1]
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.[3]
Close approaches
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This deep Mars-crosser makes close approaches both to Earth and Mars. It has an Earth minimum orbital intersection distance of 0.4258 AU (63,700,000 km ) which corresponds to 165.9 lunar distances . On 18 May 2033, the asteroid will also pass 0.0684 AU km [1]
Physical characteristics
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In the SMASS classification , Brucemurray is a stony S-type asteroid .[1] [12]
Rotation period and axis
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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=2/3 [8] [9]
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- [10]
Diameter and albedo
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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.[4] [5] [7] [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.[6]
Naming
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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. 22829[13]
References
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^ a b c Schmadel, Lutz D. (2007). "(4957) Brucemurray". Dictionary of Minor Planet Names – (4957) Brucemurray . Springer Berlin Heidelberg . p. 427. doi :10.1007/978-3-540-29925-7_4836 . ISBN 978-3-540-00238-3
^ a b c "4957 Brucemurray (1990 XJ)" . Minor Planet Center . Retrieved 15 September 2017 .
^ a b c Harris, A. W.; Mommert, M.; Hora, J. L.; Mueller, M.; Trilling, D. E.; Bhattacharya, B.; et al. (March 2011). "ExploreNEOs. II. The Accuracy of the Warm Spitzer Near-Earth Object Survey" (PDF) . The Astronomical Journal . 141 (3 ): 10. Bibcode :2011AJ....141...75H . doi :10.1088/0004-6256/141/3/75 . S2CID 14208889 .
^ a b c d Trilling, D. E.; Mueller, M.; Hora, J. L.; Harris, A. W.; Bhattacharya, B.; Bottke, W. F.; et al. (September 2010). "ExploreNEOs. I. Description and First Results from the Warm Spitzer Near-Earth Object Survey" (PDF) . The Astronomical Journal . 140 (3 ): 770–784. Bibcode :2010AJ....140..770T . doi :10.1088/0004-6256/140/3/770 . S2CID 3006566 .
^ a b c d e "LCDB Data for (4957) Brucemurray" . Asteroid Lightcurve Database (LCDB). Retrieved 15 September 2017 .
^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Bauer, J.; Cutri, R. M.; McMillan, R. S.; et al. (November 2012). "Physical Parameters of Asteroids Estimated from the WISE 3-Band Data and NEOWISE Post-Cryogenic Survey". The Astrophysical Journal Letters . 760 (1 ): 6. arXiv :1210.0502 Bibcode :2012ApJ...760L..12M . doi :10.1088/2041-8205/760/1/L12 . S2CID 41459166 .
^ a b Pravec, Petr; Sarounová, Lenka; Wolf, Marek (December 1996). "Lightcurves of 7 Near-Earth Asteroids". Icarus . 124 (2 ): 471–482. Bibcode :1996Icar..124..471P . doi :10.1006/icar.1996.0223 .
^ a b Pravec, Petr; Wolf, Marek; Sarounová, Lenka (November 1998). "Lightcurves of 26 Near-Earth Asteroids". Icarus . 136 (1 ): 124–153. Bibcode :1998Icar..136..124P . doi :10.1006/icar.1998.5993 .
^ a b Kaasalainen, Mikko; Pravec, Petr; Krugly, Yurij N.; Sarounová, Lenka; Torppa, Johanna; Virtanen, Jenni; et al. (January 2004). "Photometry and models of eight near-Earth asteroids". Icarus . 167 (1 ): 178–196. Bibcode :2004Icar..167..178K . doi :10.1016/j.icarus.2003.09.012 .
^ a b Thomas, C. A.; Trilling, D. E.; Emery, J. P.; Mueller, M.; Hora, J. L.; Benner, L. A. M.; et al. (September 2011). "ExploreNEOs. V. Average Albedo by Taxonomic Complex in the Near-Earth Asteroid Population" . The Astronomical Journal . 142 (3 ): 12. Bibcode :2011AJ....142...85T . doi :10.1088/0004-6256/142/3/85
^ a b c d e Dandy, C. L.; Fitzsimmons, A.; Collander-Brown, S. J. (June 2003). "Optical colors of 56 near-Earth objects: trends with size and orbit". Icarus . 163 (2 ): 363–373. Bibcode :2003Icar..163..363D . doi :10.1016/S0019-1035(03 )00087-3 .
^ "MPC/MPO/MPS Archive" . Minor Planet Center . Retrieved 15 September 2017 .
External links
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R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=4957_Brucemurray&oldid=1190800855 " C a t e g o r i e s : ● M i n o r p l a n e t o b j e c t a r t i c l e s ( n u m b e r e d ) ● A m o r a s t e r o i d s ● D i s c o v e r i e s b y E l e a n o r F . H e l i n ● N a m e d m i n o r p l a n e t s ● S - t y p e a s t e r o i d s ( S M A S S ) ● A s t r o n o m i c a l o b j e c t s d i s c o v e r e d i n 1 9 9 0 H i d d e n c a t e g o r i e s : ● U s e d m y d a t e s f r o m O c t o b e r 2 0 1 9 ● W e b a r c h i v e t e m p l a t e w a y b a c k l i n k s ● A r t i c l e s w i t h J P L S B D B i d e n t i f i e r s ● A r t i c l e s w i t h M P C i d e n t i f i e r s
● T h i s p a g e w a s l a s t e d i t e d o n 1 9 D e c e m b e r 2 0 2 3 , a t 2 3 : 0 5 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
