(5646) 1990 TR

(5646) 1990 TR
Discovery
Discovered by	S. Ueda; H. Kaneda
Discovery site	Kushiro Obs.
Discovery date	11 October 1990
Designations
MPC designation	(5646) 1990 TR
Alternative designations	1990 TR
Minor planet category	Amor · NEO
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	26.90 yr (9,825 days)
Aphelion	3.0791 AU
Perihelion	1.2087 AU
Semi-major axis	2.1439 AU
Eccentricity	0.4362
Orbital period (sidereal)	3.14 yr (1,147 days)
Mean anomaly	218.56°
Mean motion	0° 18m 50.4s / day
Inclination	7.9118°
Longitude of ascending node	14.141°
Argument of perihelion	335.68°
Known satellites	1
Earth MOID	0.2112 AU · 82.3 LD
Physical characteristics
Dimensions	2.03±0.52 km; 2.30 km (derived); 2.50±0.05 km; 2.723±0.525 km; 4.3 km (dated)
Synodic rotation period	3.1999±0.0002 h; 3.204±0.002 h; 6.25 h
Geometric albedo	0.18 (assumed); 0.19±0.03; 0.454±0.194; 0.65±0.43; 0.66±0.42
Spectral type	SMASS = U; Q · S · U
Absolute magnitude (H)	14.3 · 15.00 · 15.4 · 15.45 · 15.67

(5646) 1990 TR is a probable rare-type binary^[4] asteroid classified as near-Earth object of the Amor group, approximately 2.3 kilometers in diameter. It was discovered on 11 October 1990, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at Kushiro Observatory near Kushiro, in eastern Hokkaido, Japan.^[2]

Orbit

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 an eccentricity of 0.44 and an inclination of 8° with respect to the ecliptic.^[1] The body's observation arc begins with its first observation at the Siding Spring Observatory, five months prior to its official discovery observation at Kushiro.^[2]

Lightcurve

In December 2012, the so far best rated rotational lightcurve was obtained by American astronomer Brian Warner at his Palmer Divide Observatory in Colorado. Lightcurve analysis gave a rotation period of 3.1999 hours with a brightness variation of 0.12 magnitude (U=3). Photometric observations also gave a period of 19.47 hours for a probable asteroid moon, with a measured diameter-ratio of 0.18±0.02, which translates into a diameter of 400 meters for its moon.^[3]

Diameter and albedo

According to the surveys carried out by the Spitzer Space Telescope and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 2.03 and 2.723 kilometers in diameter and its surface has an albedo of 0.19 and 0.66.^[5]^[7]^[8]^[11] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.18 and derives a diameter of 2.3 kilometers based on an absolute magnitude of 15.67.^[6]

References

^ ^a ^b ^c ^d ^e ^f ^g "JPL Small-Body Database Browser: 5646 (1990 TR)" (2017-03-27 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017.
^ ^a ^b ^c "5646 (1990 TR)". Minor Planet Center. Retrieved 12 February 2017.
^ ^a ^b ^c Warner, 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.
^ ^a ^b Dr. Lance A. M. Benner (18 November 2013). "Binary and Ternary near-Earth Asteroids detected by radar". NASA/JPL Asteroid Radar Research. Archived from the original on 8 June 2004. Retrieved 1 March 2014.
^ ^a ^b ^c Mueller, 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.
^ ^a ^b ^c ^d ^e "LCDB Data for (5646)". Asteroid Lightcurve Database (LCDB). Retrieved 12 February 2017.
^ ^a ^b ^c ^d Nugent, 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.
^ ^a ^b ^c ^d Mainzer, 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.
^ 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.
^ ^a ^b Wisniewski, Wieslaw Z. (December 1992). "The unusual lightcurve of 1990 TR". In Lunar and Planetary Inst.: 653. Bibcode:1992acm..proc..653W.
^ ^a ^b Mainzer, 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.
^ 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.
^ 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.
^ ^a ^b Carry, 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

Lightcurve plot of (5646) 1990 TR, Palmer Divide Observatory, B. D. Warner (2012)
Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
Dictionary of Minor Planet Names, Google books
Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
(5646) 1990 TR at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
(5646) 1990 TR at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical properties · Summary
(5646) 1990 TR at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

[jpldata-1] ^ ^a ^b ^c ^d ^e ^f ^g "JPL Small-Body Database Browser: 5646 (1990 TR)" (2017-03-27 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017.

[MPC-5646-2] "5646 (1990 TR)". Minor Planet Center. Retrieved 12 February 2017.

[Warner-2013e-3] Warner, 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.

[Binary-4] Dr. Lance A. M. Benner (18 November 2013). "Binary and Ternary near-Earth Asteroids detected by radar". NASA/JPL Asteroid Radar Research. Archived from the original on 8 June 2004. Retrieved 1 March 2014.

[Mueller-2011a-5] Mueller, 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.

[lcdb-6] "LCDB Data for (5646)". Asteroid Lightcurve Database (LCDB). Retrieved 12 February 2017.

[Nugent-2016-7] Nugent, 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.

[WISE-8] Mainzer, 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.

[Warner-2016e-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.

[Wisniewski-1992-10] Wisniewski, Wieslaw Z. (December 1992). "The unusual lightcurve of 1990 TR". In Lunar and Planetary Inst.: 653. Bibcode:1992acm..proc..653W.

[Mainzer-2011-11] Mainzer, 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.

[Thomas-2011b-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.

[Thomas-2014-13] 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.

[Carry-2016-14] Carry, 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.

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