(155140) 2005 UD

(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
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]

(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)
  1. ^ a b c d Cite error: The named reference MPC-object was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference MPEC-2005-U22 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference jpldata was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference MPEC-2005-X10 was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference Huang2021 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Kinoshita2007 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Devogele2020 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Ohtsuka2006 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Jewitt2006 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Hanus2018 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Ryabova2019 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference MacLennan2021 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference Kareta2021 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Cukier2023 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference jpl-99YC was invoked but never defined (see the help page).