(155140) 2005 UD

(155140) 2005 UD (provisional designation 2005 UD) is an asteroid on an eccentric orbit, classified as a near-Earth object of the Apollo group. It was discovered on 22 October 2005, by the Catalina Sky Survey at the Catalina Station in Arizona, United States. 2005 UD is thought to be a possible fragment of 3200 Phaethon due to its similar orbit,[8][9] although it is not dynamically associated with the Geminid meteor stream produced by Phaethon.[10][11]

(155140) 2005 UD
Discovery[1][2]
Discovered byCatalina Sky Srvy.
Discovery siteCatalina Stn.
Discovery date22 October 2005
Designations
2005 UD
NEO · Apollo[3]
Orbital characteristics[3]
Epoch 1 July 2020 (JD 2459396.5)
Uncertainty parameter 0
Observation arc38.76 yr (14,157 days)
Earliest precovery date11 November 1982[4]
Aphelion2.387 AU
Perihelion0.1629 AU
1.275 AU
Eccentricity0.8722
1.44 yr (525.8 days)
1.976°
0° 41m 5.026s / day
Inclination28.660°
19.714°
207.603°
Earth MOID0.07759 AU (11,607,000 km)
Mercury MOID0.09496 AU (14,206,000 km)
Venus MOID0.07997 AU (11,963,000 km)
Mars MOID0.04058 AU (6,071,000 km)[1]
Physical characteristics
Mean diameter
1.28±0.02 km[5]
5.23400+0.00004
−0.00001 h[5]
−25.8°+5.3°
−12.5°[5]
285.8°+1.1°
−5.3°[5]
0.14±0.02[5]
C[6]
17.0 (discovery)[2]
17.22±0.03[5]
17.51±0.02[7]
17.42[3][1]

    Due to 2005 UD's highly eccentric orbit, it experiences extreme temperature variations up to 975 K (702 °C; 1,295 °F) at perihelion, leading to thermal fracturing of its surface regolith and ejection of dust particles.[12] However, no activity from 2005 UD has been observed as of yet, though it has been suspected that it could be the inactive parent body of the Daytime Sextantids meteor shower.[7][13] 2005 UD and Phaethon share a bluish surface color at visible wavelengths, but differ at near-infrared wavelengths where 2005 UD appears redder than Phaethon.[13]

    2005 UD will pass 0.0558 AU (8.35 million km) from Mars on 20 July 2024.[3]

    Potential Family Members[14]
    Object Size Earth
    MOID
    (AU)    		 Perihelion
    (AU)    		 Mars
    MOID
    (AU)
    3200 Phaethon6 km0.02 AU (3.0 million km)0.14 AU (21 million km)0.14 AU (21 million km)
    (155140) 2005 UD[3]1.3 km0.08 AU (12 million km)0.16 AU (24 million km)0.04 AU (6.0 million km)[1]
    (225416) 1999 YC[15]1.7 km0.25 AU (37 million km)0.24 AU (36 million km)0.10 AU (15 million km)

    See also

    References
    1. "(155140) = 2005 UD". Minor Planet Center. International Astronomical Union. Retrieved 5 September 2021.
    2. "MPEC 2005-U22 : 2005 UD". Minor Planet Electronic Circular. Minor Planet Center. 23 October 2005. Retrieved 5 September 2021.
    3. "JPL Small-Body Database Browser: 155140 (2005 UD)" (2022-10-31 last obs.). Jet Propulsion Laboratory. Retrieved 5 September 2021.
    4. "MPEC 2005-X10 : 2005 UD". Minor Planet Electronic Circular. Minor Planet Center. 2 December 2005. Retrieved 5 September 2021.
    5. Huang, J.-N.; Muinonen, K.; Chen, T.; Wang, X.-B. (June 2020). "Photometric study for near-Earth asteroid (155140) 2005 UD". Planetary and Space Science. 195: 105120. arXiv:2008.11442. Bibcode:2021P&SS..19505120H. doi:10.1016/j.pss.2020.105120. S2CID 221319706.
    6. Kinoshita, D.; Ohtsuka, K.; Sekiguchi, T.; Watanabe, J.; Ito, H.; Arakida, T.; et al. (May 2007). "Surface heterogeneity of 2005 UD from photometric observations" (PDF). Astronomy & Astrophysics. 466 (3): 1153–1158. Bibcode:2007A&A...466.1153K. doi:10.1051/0004-6361:20066276. S2CID 55255286.
    7. Devogèle, Maxime; MacLennan, Eric; Gustafsson, Annika; Moskovitz, Nicholas; Chatelain, Joey; Borisov, Galin; et al. (June 2020). "New Evidence for a Physical Link between Asteroids (155140) 2005 UD and (3200) Phaethon". The Planetary Science Journal. 1 (1): 15. Bibcode:2020PSJ.....1...15D. doi:10.3847/PSJ/ab8e45. S2CID 219521769.
    8. Ohtsuka, K.; Sekiguchi, T.; Kinoshita, D.; Watanabe, J.-I.; Ito, T.; Arakida, H.; Kasuga, T. (May 2006). "Apollo asteroid 2005 UD: split nucleus of (3200) Phaethon?" (PDF). Astronomy & Astrophysics. 450 (3): L25–L28. Bibcode:2006A&A...450L..25O. doi:10.1051/0004-6361:200600022. S2CID 120802314.
    9. Jewitt, David; Hsieh, Henry (October 2006). "Physical Observations of 2005 UD: A Mini-Phaethon". The Astronomical Journal. 132 (4): 1624–1629. Bibcode:2006AJ....132.1624J. doi:10.1086/507483. S2CID 121479835.
    10. Hanuš, J.; Vokrouhlický, D.; Delbo', M.; Farnocchia, D.; Polishook, D.; Pravec, P.; et al. (December 2018). "(3200) Phaethon: Bulk density from Yarkovsky drift detection" (PDF). Astronomy & Astrophysics. 620: L8. arXiv:1811.10953. Bibcode:2018A&A...620L...8H. doi:10.1051/0004-6361/201834228. S2CID 119378304.
    11. Ryabova, G. O.; Avdyushev, V. A.; Williams, I. P. (May 2019). "Asteroid (3200) Phaethon and the Geminid meteoroid stream complex". Monthly Notices of the Royal Astronomical Society. 485 (3): 3378–3385. Bibcode:2019MNRAS.485.3378R. doi:10.1093/mnras/stz658. S2CID 126849510.
    12. MacLennan, Eric; Toliou, Athanasia; Granvik, Mikael (September 2020). "Dynamical evolution and thermal history of asteroids (3200) Phaethon and (155140) 2005 UD". Icarus. 366: 114535. arXiv:2010.10633. Bibcode:2021Icar..36614535M. doi:10.1016/j.icarus.2021.114535. S2CID 224814434.
    13. Kareta, Theodore; Reddy, Vishnu; Pearson, Neil; Sanchez, Juan A.; Harris, Walter M. (September 2021). "Investigating the Relationship between (3200) Phaethon and (155140) 2005 UD through Telescopic and Laboratory Studies". The Planetary Science Journal. 2 (5): 190. arXiv:2109.01020. Bibcode:2021PSJ.....2..190K. doi:10.3847/PSJ/ac1bad.
    14. Cukier, W. Z.; Szalay, J. R. (June 1, 2023). "Formation, Structure, and Detectability of the Geminids Meteoroid Stream". The Planetary Science Journal. 4 (6): 109. arXiv:2306.11151. doi:10.3847/psj/acd538. ISSN 2632-3338. Retrieved June 29, 2023.
    15. "JPL Small-Body Database Browser: 225416 (1999 YC)". Jet Propulsion Laboratory.
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