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2100 Ra-Shalom

Asteroid and near-Earth object

Field	Value
minorplanet	yes
name	2100 Ra-Shalom
background	#FFC2E0
image	002100-asteroid shape model (2100) Ra-Shalom.png
caption	Shape model of Ra-Shalom from its lightcurve
discovery_ref
discovered	10 September 1978
discoverer	E. F. Helin
discovery_site	Palomar Obs.
mpc_name	(2100) Ra-Shalom
pronounced
alt_names	1978 RA1975 TB
named_after	Ra and Shalom
(composed name)
mp_category	NEOAten
orbit_ref
epoch	7 November 2005 (JD 2453681.5)
uncertainty	0
observation_arc	41.07 yr (14,999 days)
aphelion	1.1952 AU
perihelion	0.4688 AU
semimajor	0.8320 AU
eccentricity	0.4365
period	0.76 yr (277 days)
mean_anomaly	104.56°
inclination	15.756°
asc_node	170.88°
arg_peri	355.98°
moid	0.1496 AU58.3 LD
mean_diameter	km
km
km
km
km
km
km
km
rotation	h
h
19.797 h
h
h

albedo

spectral_type	C (Tholen)Xc (SMASS)
C (CALL)K
B–V = 0.712
U–B = 0.310
abs_magnitude	(R)15.9016.0516.0616.0716.116.11

(composed name) km km km km km km km h 19.797 h h h

C (CALL)K B–V = 0.712 U–B = 0.310

2100 Ra-Shalom (prov. designation: ) is an asteroid and near-Earth object of the Aten group on an eccentric orbit in the inner Solar System. It was discovered on 10 September 1978, by American astronomer Eleanor Helin at the Palomar Observatory, California, who named it in commemoration of the Camp David Peace Accords. The C-type asteroid (Xc, K) has a rotation period of 19.8 hours and measures approximately 2.7 km in diameter.

Orbit and classification

Ra-Shalom orbits the Sun at a distance of 0.5 - once every 9 months (277 days). Its orbit has an eccentricity of 0.44 and an inclination of 16° with respect to the ecliptic.

It was the second Aten asteroid to be discovered after 2062 Aten, the family's namesake, also discovered by Helin in 1976. The group of Aten asteroids feature a semi-major axis of less than 1 au. Of this group, Ra-Shalom has one of the smallest semi-major axes, just 0.832 au.

The asteroid has an Earth minimum orbital intersection distance of 0.1496 au which corresponds to 58.3 lunar distances, far too large to make it a potentially hazardous object. It also comes within 30 e6km of Mars, Venus and Mercury. The closest approaches are to Mercury, to about 0.0784 au.

Naming

The minor planet's composed named was chosen by the discoverer to commemorate the Camp David Peace Accords between Egypt and Israel in September 1978, and as a symbol for the universal hope for peace. Ra is the Egyptian Sun-god, who symbolizes enlightenment and life, while Shalom is the traditional Hebrew greeting meaning peace. The official was published by the Minor Planet Center on 1 November 1978 (M.P.C. 4548).

Physical characteristics

Ra-Shalom has been characterized as a C-type and X-type asteroid on the Tholen and SMASS taxonomic scheme, respectively. It has also been characterized as a K-type asteroid. In 1981, the asteroid was detected using radar, revealing a relatively smooth surface at decimeter scales.

Rotation period

In August 2016, a rotational lightcurve of Ra-Shalom was obtained from photometric observations by American astronomer Brian Warner. Lightcurve analysis gave a well-defined rotation period of 19.89 hours with a brightness amplitude of 0.55 magnitude ().

A large number of previous photometric observations gave a period between 19.79 and 19.8201 hours with a brightness amplitude between 0.3 and 0.41 magnitude.

Diameter and albedo

According to Spitzer Space Telescope's ExploreNEOs survey, the Japanese Akari satellite, and NASA's Keck Observatory, Ra-Shalom measures between 1.98 and 2.79 kilometers in diameter and its surface has an albedo between 0.080 and 0.177. The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.082 and a diameter of 2.78 kilometers with an absolute magnitude of 16.054.

Notes

References

{{dict.com. shalom

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

aten-asteroids discoveries-by-eleanor-f.-helin named-minor-planets radar-imaged-asteroids c-type-asteroids-(tholen) xc-type-asteroids-(smass) astronomical-objects-discovered-in-1978

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