(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, although it is not dynamically associated with the Geminid meteor stream produced by Phaethon.

(155140) 2005 UD
Discovery
Discovered byCatalina Sky Srvy.
Discovery siteCatalina Stn.
Discovery date22 October 2005
Designations
MPC designation
2005 UD
Minor planet category
NEO · Apollo
Orbital characteristics
Epoch 1 July 2020 (JD 2459396.5)
Uncertainty parameter 0
Observation arc38.76 yr (14,157 days)
Earliest precovery date11 November 1982
Aphelion2.387 AU
Perihelion0.1629 AU
Semi-major axis
1.275 AU
Eccentricity0.8722
Orbital period (sidereal)
1.44 yr (525.8 days)
Mean anomaly
1.976°
Mean motion
0° 41m 5.026s / day
Inclination28.660°
Longitude of ascending node
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)
Physical characteristics
Mean diameter
1.28±0.02 km
Synodic rotation period
5.23400+0.00004
−0.00001 h
−25.8°+5.3°
−12.5°
285.8°+1.1°
−5.3°
0.14±0.02
C
17.0 (discovery)
17.22±0.03
17.51±0.02
17.42

    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. 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. 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.

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

    Potential Family Members
    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 UD1.3 km0.08 AU (12 million km)0.16 AU (24 million km)0.04 AU (6.0 million km)
    (225416) 1999 YC1.7 km0.25 AU (37 million km)0.24 AU (36 million km)0.10 AU (15 million km)
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