Astronomy:990 Yerkes

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990 Yerkes
Discovery
Discovered byG. Van Biesbroeck
Discovery siteWilliams Bay
Discovery date23 November 1922
Designations
(990) Yerkes
Pronunciation/ˈjɜːrkz/
1922 MZ
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc102.46 yr (37425 days)
|{{{apsis}}}|helion}}3.2477 astronomical unit|AU (485.85 Gm)
|{{{apsis}}}|helion}}2.0916 AU (312.90 Gm)
2.6696 AU (399.37 Gm)
Eccentricity0.21652
Orbital period4.36 yr (1593.2 d)
Mean anomaly216.84°
Mean motion0° 13m 33.456s / day
Inclination8.7872°
Longitude of ascending node353.971°
9.4832°
Physical characteristics
Mean radius9.23±0.6 km
Rotation period24.56 h (1.023 d)
Sidereal rotation period24.45 ± 0.05[2] h
Geometric albedo0.1303±0.018
Absolute magnitude (H)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

  1. "990 Yerkes (1922 MZ)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=990;cad=1. 
  2. 2.0 2.1 Ruthroff, John C. (April 2010), "Lightcurve Analysis of Asteroid 990 Yerkes", The Minor Planet Bulletin 37 (2): 74, Bibcode2010MPBu...37...74R. 

External links