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(5646) 1990 TR

From Wikipedia, the free encyclopedia
Probable rare-type binary asteroid

(5646) 1990 TR
Discovery[1]
Discovered byS. Ueda
H. Kaneda
Discovery siteKushiro Obs.
Discovery date11 October 1990
Designations
(5646) 1990 TR
1990 TR
Amor · NEO[1][2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc26.90 yr (9,825 days)
Aphelion3.0791AU
Perihelion1.2087 AU
2.1439 AU
Eccentricity0.4362
3.14yr (1,147 days)
218.56°
0° 18m 50.4s / day
Inclination7.9118°
14.141°
335.68°
Knownsatellites1[3][4]
Earth MOID0.2112 AU · 82.3LD
Physical characteristics
Dimensions2.03±0.52 km[5]
2.30 km(derived)[6]
2.50±0.05 km[7]
2.723±0.525 km[8]
4.3 km(dated)[1]
3.1999±0.0002 h[3]
3.204±0.002 h[9]
6.25h[10]
0.18(assumed)[6]
0.19±0.03[7]
0.454±0.194[8][11]
0.65±0.43[5]
0.66±0.42[12]
SMASS = U[1]
Q[13] · S[14] · U[6]
14.3[8] · 15.00[14] · 15.4[1] · 15.45[7] · 15.67[6][10]

(5646) 1990 TR is a probable rare-typebinary[4]asteroid classified asnear-Earth object of theAmor group, approximately 2.3 kilometers in diameter. It was discovered on 11 October 1990, by Japanese astronomersSeiji Ueda andHiroshi Kaneda atKushiro Observatory nearKushiro, in eastern Hokkaido, Japan.[2]

Orbit

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The asteroid orbits the Sun at a distance of 1.2–3.1 AU once every 3 years and 2 months (1,147 days). Its orbit has aneccentricity of 0.44 and aninclination of 8° with respect to theecliptic.[1] The body'sobservation arc begins with its first observation at theSiding Spring Observatory, five months prior to its official discovery observation at Kushiro.[2]

Lightcurve

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In December 2012, the so far best rated rotationallightcurve was obtained by American astronomerBrian Warner at his Palmer Divide Observatory in Colorado. Lightcurve analysis gave arotation period of 3.1999 hours with a brightness variation of 0.12magnitude (U=3). Photometric observations also gave a period of 19.47 hours for a probableasteroid moon, with a measured diameter-ratio of0.18±0.02, which translates into a diameter of 400 meters for its moon.[3]

Diameter and albedo

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According to the surveys carried out by theSpitzer Space Telescope and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, the asteroid measures 2.03 and 2.723 kilometers in diameter and its surface has analbedo of 0.19 and 0.66.[5][7][8][11] TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.18 and derives a diameter of 2.3 kilometers based on anabsolute magnitude of 15.67.[6]

References

[edit]
  1. ^abcdefg"JPL Small-Body Database Browser: 5646 (1990 TR)" (2017-03-27 last obs.).Jet Propulsion Laboratory. Retrieved26 May 2017.
  2. ^abc"5646 (1990 TR)".Minor Planet Center. Retrieved12 February 2017.
  3. ^abcWarner, Brian D. (April 2013)."Seeing Double Old and New: Observations and Lightcurve Analysis at the Palmer Divide Observatory of Six Binary Asteroids".The Minor Planet Bulletin.40 (2):94–98.Bibcode:2013MPBu...40...94W.ISSN 1052-8091.PMC 7120868.PMID 32259164.
  4. ^abDr. Lance A. M. Benner (18 November 2013)."Binary and Ternary near-Earth Asteroids detected by radar". NASA/JPL Asteroid Radar Research. Archived fromthe original on 8 June 2004. Retrieved1 March 2014.
  5. ^abcMueller, Michael; Delbo', M.; Hora, J. L.; Trilling, D. E.; Bhattacharya, B.; Bottke, W. F.; et al. (April 2011)."ExploreNEOs. III. Physical Characterization of 65 Potential Spacecraft Target Asteroids"(PDF).The Astronomical Journal.141 (4): 9.Bibcode:2011AJ....141..109M.doi:10.1088/0004-6256/141/4/109.S2CID 44827674.
  6. ^abcde"LCDB Data for (5646)". Asteroid Lightcurve Database (LCDB). Retrieved12 February 2017.
  7. ^abcdNugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016)."NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos".The Astronomical Journal.152 (3): 12.arXiv:1606.08923.Bibcode:2016AJ....152...63N.doi:10.3847/0004-6256/152/3/63.S2CID 119289027.
  8. ^abcdMainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results".The Astrophysical Journal.741 (2): 25.arXiv:1109.6407.Bibcode:2011ApJ...741...90M.doi:10.1088/0004-637X/741/2/90.S2CID 118700974.
  9. ^Warner, Brian D. (April 2016)."Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 October-December".The Minor Planet Bulletin.43 (2):143–154.Bibcode:2016MPBu...43..143W.ISSN 1052-8091.PMC 7243997.PMID 32455373.
  10. ^abWisniewski, Wieslaw Z. (December 1992). "The unusual lightcurve of 1990 TR".In Lunar and Planetary Inst.: 653.Bibcode:1992acm..proc..653W.
  11. ^abMainzer, A.; Grav, T.; Bauer, J.; Masiero, J.; McMillan, R. S.; Cutri, R. M.; et al. (December 2011). "NEOWISE Observations of Near-Earth Objects: Preliminary Results".The Astrophysical Journal.743 (2): 17.arXiv:1109.6400.Bibcode:2011ApJ...743..156M.doi:10.1088/0004-637X/743/2/156.S2CID 239991.
  12. ^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.
  13. ^Thomas, Cristina A.; Emery, Joshua P.; Trilling, David E.; Delbó, Marco; Hora, Joseph L.; Mueller, Michael (January 2014). "Physical characterization of Warm Spitzer-observed near-Earth objects".Icarus.228:217–246.arXiv:1310.2000.Bibcode:2014Icar..228..217T.doi:10.1016/j.icarus.2013.10.004.S2CID 119278697.
  14. ^abCarry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry".Icarus.268:340–354.arXiv:1601.02087.Bibcode:2016Icar..268..340C.doi:10.1016/j.icarus.2015.12.047.S2CID 119258489.

External links

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