A three-dimensional model of 2100 Ra-Shalom based on its light curve.
|Discovered by||EF Helin|
|Minor planet category||Aten NEO|
|Aphelion||1.195 AU (Q)|
|Perihelion||0.4688 AU (q)|
|Semi-major axis||0.8320 AU (a)|
|Orbital period||277.2 days|
|Dimensions||2.3 ± 0.2 km|
|Rotation period||19.797 hr|
|Absolute magnitude (H)||16.05|
The asteroid 2100 Ra-Shalom was discovered in 1978 by Eleanor F. Helin. It was the second asteroid in the Aten class, after the discovery of 2062 Aten in 1976, also by Helin. The Atens have a semi-major axis of less than 1 AU; of the Atens, Ra-Shalom is one of the asteroids with the smallest semi-major axes: just 0.832 AU. It comes within 30 Gm of Mars, Earth, Venus, and Mercury. The closest approaches are to Mercury, to about 0.0784 AU (11.7 Gm). In 1981, this object was detected using radar, revealing a relatively smooth surface at decimeter scales.
- "JPL Small-Body Database Browser: 2100 Ra-Shalom (1978 RA)". Jet Propulsion Laboratory. 2013-10-25 last obs (arc=38 yr). Retrieved 2014-02-23.
- "JPL Close-Approach Data: 2100 Ra-Shalom (1978 RA)". 2013-10-25 last obs. Retrieved 2009-05-05.
- Ostro, S. J.; Harris, A. W.; Campbell, D. B.; Shapiro, I. I.; Young, J. W. (November 1984), "Radar and photoelectric observations of asteroid 2100 Ra-Shalom", Icarus 60: 391–403, Bibcode:1984Icar...60..391O, doi:10.1016/0019-1035(84)90198-2
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