990 Yerkes

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990 Yerkes
Discovery
Discovered byG. Van Biesbroeck
Discovery siteWilliams Bay
Discovery date23 November 1922
Designations
MPC designation(990) Yerkes
1922 MZ
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc102.46 yr (37425 days)
Aphelion3.2477 AU (485.85 Gm)
Perihelion2.0916 AU (312.90 Gm)
2.6696 AU (399.37 Gm)
Eccentricity0.21652
4.36 yr (1593.2 d)
216.84°
0° 13m 33.456s / day
Inclination8.7872°
353.971°
9.4832°
Physical characteristics
Mean radius
9.23±0.6 km
24.56 h (1.023 d)
24.45 ± 0.05[2] h
0.1303±0.018
11.7

990 Yerkes is a main belt asteroid discovered by Belgian-American astronomer George Van Biesbroeck in 1922, and named after the Yerkes Observatory.

Photometric observations of this asteroid collected during 2009 show a rotation period of 24.45 ± 0.05 hours with a brightness variation of 0.35 ± 0.05 magnitude.[2]

References[edit]

  1. ^ "990 Yerkes (1922 MZ)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 2 May 2016.
  2. ^ a b Ruthroff, John C. (April 2010), "Lightcurve Analysis of Asteroid 990 Yerkes", The Minor Planet Bulletin, 37 (2): 74, Bibcode:2010MPBu...37...74R.

External links[edit]