(155140) 2005 UD

(155140) 2005 UD

Discovery[1][2]
Discovered by	Catalina Sky Srvy.
Discovery site	Catalina Stn.
Discovery date	22 October 2005
Designations
MPC designation	2005 UD
Minor planet category	NEO · Apollo[3]
Orbital characteristics[3]
Epoch 1 July 2020 (JD 2459396.5)
Uncertainty parameter 0
Observation arc	38.76 yr (14,157 days)
Earliest precovery date	11 November 1982[4]
Aphelion	2.387 AU
Perihelion	0.1629 AU
Semi-major axis	1.275 AU
Eccentricity	0.8722
Orbital period (sidereal)	1.44 yr (525.8 days)
Mean anomaly	1.976°
Mean motion	0° 41^m 5.026^s / day
Inclination	28.660°
Longitude of ascending node	19.714°
Argument of perihelion	207.603°
Earth MOID	0.07759 AU (11,607,000 km)
Mercury MOID	0.09496 AU (14,206,000 km)
Venus MOID	0.07997 AU (11,963,000 km)
Mars MOID	0.04058 AU (6,071,000 km)[1]
Physical characteristics
Mean diameter	1.28±0.02 km[5]
Synodic rotation period	5.23400+0.00004 −0.00001 h[5]
Pole ecliptic latitude	−25.8°+5.3° −12.5°[5]
Pole ecliptic longitude	285.8°+1.1° −5.3°[5]
Geometric albedo	0.14±0.02[5]
Spectral type	C[6]
Apparent magnitude	17.0 (discovery)[2]
Absolute magnitude (H)	17.22±0.03[5] 17.51±0.02[7] 17.42[3][1]

(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]

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 Phaethon	6 km	0.02 AU (3.0 million km)	0.14 AU (21 million km)	0.14 AU (21 million km)
(155140) 2005 UD[3]	1.3 km	0.08 AU (12 million km)	0.16 AU (24 million km)	0.04 AU (6.0 million km)[1]
(225416) 1999 YC[15]	1.7 km	0.25 AU (37 million km)	0.24 AU (36 million km)	0.10 AU (15 million km)

See also

• Active asteroid
• (196256) 2003 EH1, a suspected extinct comet and proposed parent body of the Quadrantids meteor shower^[13]

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. Bibcode:2023PSJ.....4..109C. doi:10.3847/psj/acd538. ISSN 2632-3338.
15. "JPL Small-Body Database Browser: 225416 (1999 YC)". Jet Propulsion Laboratory.

External links

• Exploring Links Between Nearby Asteroids, Susanna Kohler, AAS Nova, 19 June 2020
• (155140) 2005 UD at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
• (155140) 2005 UD at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters