astro.wikisort.org - Asteroid

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

990 Yerkes

Discovery
Discovered by	G. Van Biesbroeck
Discovery site	Williams Bay
Discovery date	23 November 1922
Designations
MPC designation	(990) Yerkes
Pronunciation	/ˈjɜːrkiːz/
Alternative designations	1922 MZ
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	102.46 yr (37425 days)
Aphelion	3.2477 AU (485.85 Gm)
Perihelion	2.0916 AU (312.90 Gm)
Semi-major axis	2.6696 AU (399.37 Gm)
Eccentricity	0.21652
Orbital period (sidereal)	4.36 yr (1593.2 d)
Mean anomaly	216.84°
Mean motion	0° 13m 33.456s / day
Inclination	8.7872°
Longitude of ascending node	353.971°
Argument of perihelion	9.4832°
Physical characteristics
Mean radius	9.23±0.6 km
Synodic rotation period	24.56 h (1.023 d)
Sidereal rotation period	24.45 ± 0.05[2] h
Geometric albedo	0.1303±0.018
Absolute magnitude (H)	11.7

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

External links

• 990 Yerkes at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 990 Yerkes at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (990) Yerkes

(990) Yerkes ist ein Asteroid des Hauptgürtels, der am 23. November 1922 vom belgischen Astronomen George Van Biesbroeck am Yerkes-Observatorium in Williams Bay, Wisconsin entdeckt wurde.

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- [en] 990 Yerkes

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