(219774) 2001 YY145

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(219774) 2001 YY145
Discovery [1]
Discovered by LONEOS
Discovery site Anderson Mesa Stn.
Discovery date 18 December 2001
MPC designation (219774) 2001 YY145
2001 YY145 · 2005 TA170
main-belt · (central)[2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 14.50 yr (5,297 days)
Aphelion 2.9209 AU
Perihelion 2.2404 AU
2.5807 AU
Eccentricity 0.1318
4.15 yr (1,514 days)
0° 14m 15.72s / day
Inclination 9.6007°
Physical characteristics
Dimensions 1.54 km (calculated)[2]
1007.6706±86.3718 h[3]
0.20 (assumed)[2]
15.9[1] · 15.977±0.011 (R)[3] · 16.43[2]

(219774) 2001 YY145 is a stony asteroid and exceptionally slow rotator from the middle region of the asteroid belt, approximately 1.5 kilometers in diameter. It was discovered on 18 December 2001, by the U.S. Lowell Observatory Near-Earth-Object Search (LONEOS) at Anderson Mesa Station near Flagstaff, Arizona.[4]

Orbit and classification[edit]

This asteroid orbits the Sun in the central main-belt at a distance of 2.2–2.9 AU once every 4 years and 2 months (1,514 days). Its orbit has an eccentricity of 0.13 and an inclination of 10° with respect to the ecliptic.[1] A first precovery was taken at Lincoln Lab's ETS in October 2001, extending the asteroid's observation arc by 2 months prior to its official discovery observation.[4]

Physical characteristics[edit]

2001 YY145 is an assumed common stony asteroid.[2]

Slow rotator[edit]

A rotational lightcurve was obtained of this asteroid from photometric observations taken at the Californian Palomar Transient Factory in October 2013. It gave a rotation period of 1007.7 hours with an estimated error margin of ±86 hours. According to the Light Curve Data Base, it is the 11th slowest rotating minor planet known to exist. Due to its high brightness variation of 0.86 magnitude, the body is likely to have a non-spheroidal shape (U=2).[3]

Diameter and albedo[edit]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 1.54 kilometers, based on an absolute magnitude of 16.43.[2]

Numbering and naming[edit]

This minor planet was numbered by the Minor Planet Center on 4 October 2009.[5] As of 2018, it has not been named.[4]


  1. ^ a b c d "JPL Small-Body Database Browser: 219774 (2001 YY145)" (2016-04-26 last obs.). Jet Propulsion Laboratory. Retrieved 1 June 2017. 
  2. ^ a b c d e f g "LCDB Data for (219774)". Asteroid Lightcurve Database (LCDB). Retrieved 13 September 2016. 
  3. ^ a b c Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 13 September 2016. 
  4. ^ a b c "219774 (2001 YY145)". Minor Planet Center. Retrieved 13 September 2016. 
  5. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018. 

External links[edit]