(164121) 2003 YT1

(164121) 2003 YT1
Discovery [1]
Discovered by Catalina Sky Srvy.
Discovery site Catalina Stn.
Discovery date 18 December 2003
Designations
MPC designation (164121) 2003 YT1
2003 YT1
Apollo · NEO · PHA [1][2]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 35.41 yr (12,934 d)
Aphelion 1.4335 AU
Perihelion 0.7857 AU
1.1096 AU
Eccentricity 0.2919
1.17 yr (427 d)
11.417°
0° 50m 35.88s / day
Inclination 44.064°
38.335°
91.042°
Known satellites 1 (D: 210 m; P: 30 h)[3][4]
Earth MOID 0.0027 AU (1.0519 LD)
Physical characteristics
Mean diameter
 1.0 km[3]
1.100±0.088 km[5]
1.561±0.202 km[6]
1.717±0.550 km[7]
2.34 h[8]
2.343 h[3]
2.343 h[9]
3.0025±0.0001 h[10]
0.198±0.153[7]
0.240±0.067[6]
0.36±0.20[11]
0.486±0.040[11]
0.4861±0.0395[5]
0.5848 (derived)[12]
V [12][13][14]
16.2[2][5][12]
16.20±0.3[7]

    (164121) 2003 YT1, provisional designation 2003 YT1, is a bright asteroid and synchronous binary system on a highly eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 2 kilometers (1.2 miles) in diameter. It was discovered on 18 December 2003, by astronomers with the Catalina Sky Survey at the Catalina Station near Tucson, Arizona, in the United States.[1] The V-type asteroid has a short rotation period of 2.3 hours.[12] Its 210-meter sized minor-planet moon was discovered at Arecibo Observatory in May 2004.[3][4]

    Orbit and classification

    2003 YT1 is a member of the Earth-crossing group of Apollo asteroids, the largest group of near-Earth objects with approximately 10 thousand known members.[1][2]

    It orbits the Sun at a distance of 0.8–1.4 AU once every 1 years and 2 months (427 days; semi-major axis of 1.11 AU). Its orbit has an eccentricity of 0.29 and an inclination of 44° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at the Siding Spring Observatory in November 1989, more than 14 years prior to its official discovery observation at Catalina.[1]

    Close approaches and Torino rating

    The asteroid has an Earth minimum orbital intersection distance of 0.0027 AU (404,000 km; 251,000 mi), which corresponds to 1.05 lunar distances and makes it a potentially hazardous asteroid due to its sufficiently large size.[2] On the Torino Scale, this object was rated level 1 on 27 December 2003 with an observation arc of 8.7 days.[15] It was removed from the risk table on 29 December 2003.[16]

    On 30 April 2004 it made a close approach at a nominal distance of 0.073 AU (28 LD), and on 31 October 2016, it passed Earth at 0.034 AU (13 LD). The asteroid's closest encounter with Earth will be on 29 April 2073, when it is projected to pass at 0.0113 AU (4.4 LD) only (see table).[2]

    Physical characteristics

    This object has been characterized as a bright Vestian-like V-type asteroid.[12][14][13]

    Rotation period

    Several rotational lightcurve of this asteroid have been obtained from photometric observations (U=2/n.a./3/3).[8][3][9][10] Analysis of the best-rated lightcurve gave a short rotation period of 2.343 hours with a brightness amplitude between 0.16 and 0.27 magnitude.[12]

    Diameter and albedo

    According to radar observations with the Arecibo Observatory and the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, this asteroid measures between 1.0 and 1.717 kilometers in diameter and its surface has an albedo between 0.198 and 0.4861.[3][5][6][7][11][11]

    The Collaborative Asteroid Lightcurve Link derives an albedo of 0.5848 and adopts a diameter of 1.0 kilometer based on an absolute magnitude of 16.2.[12]

    Satellite

    The Arecibo radar observations in May 2004 revealed that 2003 YT1 is a synchronous binary asteroid.[3] Follow-up observations confirmed a 210-meter sized minor-planet moon orbiting its primary every 30 hours.[4][9]

    Numbering and naming

    This minor planet was numbered by the Minor Planet Center on 26 September 2007 (M.P.C. 60686).[17] As of 2018, it has not been named.[1]

    References

    1. 1 2 3 4 5 6 "164121 (2003 YT1)". Minor Planet Center. Retrieved 20 April 2018.
    2. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 164121 (2003 YT1)" (2018-04-18 last obs.). Jet Propulsion Laboratory. Retrieved 20 April 2018.
    3. 1 2 3 4 5 6 7 Nolan, M. C.; Howell, E. S.; Hine, A. A. (May 2004). "2003 YT_1". IAU Circ. (8336). Bibcode:2004IAUC.8336....3N. Retrieved 20 April 2018.
    4. 1 2 3 Johnston, Wm. Robert (20 September 2014). "Asteroids with Satellites Database – (164121) 2003 YT1". Johnston's Archive. Retrieved 20 April 2018.
    5. 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 20 April 2018.
    6. 1 2 3 Delbo, Marco; Walsh, Kevin; Mueller, Michael; Harris, Alan W.; Howell, Ellen S. (March 2011). "The cool surfaces of binary near-Earth asteroids". Icarus. 212 (1): 138–148. Bibcode:2011Icar..212..138D. doi:10.1016/j.icarus.2010.12.011. Retrieved 20 April 2018.
    7. 1 2 3 4 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" (PDF). The Astrophysical Journal Letters. 760 (1): 6. arXiv:1210.0502. Bibcode:2012ApJ...760L..12M. doi:10.1088/2041-8205/760/1/L12. Retrieved 20 April 2018.
    8. 1 2 Larson, S. M.; Grauer, A. D.; Beshore, E.; Christensen, E.; Pravec, P.; Kaasalainen, M.; et al. (November 2004). "Physical Characteristics of the Binary PHA 2003 YT1". American Astronomical Society. 36: 1139. Bibcode:2004DPS....36.3207L. Retrieved 20 April 2018.
    9. 1 2 3 Pravec, P.; Scheirich, P.; Kusnirák, P.; Sarounová, L.; Mottola, S.; Hahn, G.; et al. (March 2006). "Photometric survey of binary near-Earth asteroids". Icarus. 181 (1): 63–93. Bibcode:2006Icar..181...63P. doi:10.1016/j.icarus.2005.10.014. Retrieved 20 April 2018.
    10. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (164121)". Geneva Observatory. Retrieved 21 April 2018.
    11. 1 2 3 4 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" (PDF). The Astrophysical Journal. 743 (2): 17. arXiv:1109.6400. Bibcode:2011ApJ...743..156M. doi:10.1088/0004-637X/743/2/156. Retrieved 20 April 2018.
    12. 1 2 3 4 5 6 7 "LCDB Data for (164121)". Asteroid Lightcurve Database (LCDB). Retrieved 20 April 2018.
    13. 1 2 Sanchez, Juan A.; Michelsen, René; Reddy, Vishnu; Nathues, Andreas (July 2013). "Surface composition and taxonomic classification of a group of near-Earth and Mars-crossing asteroids" (PDF). Icarus. 225 (1): 131–140. arXiv:1302.4449. Bibcode:2013Icar..225..131S. doi:10.1016/j.icarus.2013.02.036. Retrieved 21 April 2018.
    14. 1 2 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" (PDF). Icarus. 228: 217–246. arXiv:1310.2000. Bibcode:2014Icar..228..217T. doi:10.1016/j.icarus.2013.10.004. Retrieved 20 April 2018.
    15. ↑ "Major News about Minor Objects (2003 YT1)". hohmanntransfer. 2003-12-27. Retrieved 20 April 2018.
    16. ↑ "NEOs Removed from Impact Risks Tables". Near Earth Object Program. NASA. Retrieved 20 April 2018.
    17. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 20 April 2018.

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