2143 Jimarnold

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2143 Jimarnold
Discovery [1]
Discovered byE. F. Helin
Discovery sitePalomar Obs.
Discovery date26 September 1973
MPC designation(2143) Jimarnold
Named after
James R. Arnold[2]
(American chemist)
1973 SA · 1980 VZ1
main-belt · (inner)
background [3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc62.13 yr (22,693 d)
Aphelion2.8147 AU
Perihelion1.7468 AU
2.2807 AU
3.44 yr (1,258 days)
0° 17m 9.96s / day
Physical characteristics
Dimensions4.934±0.145 km[4]

2143 Jimarnold, provisional designation 1973 SA, is a background asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 26 September 1973, by astronomer Eleanor Helin at the Palomar Observatory in California, United States.[5] The asteroid was named after American cosmochemist, James R. Arnold.[2]

Orbit and classification[edit]

Jimarnold is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the inner asteroid belt at a distance of 1.7–2.8 AU once every 3 years and 5 months (1,258 days; semi-major axis of 2.28 AU). Its orbit has an eccentricity of 0.23 and an inclination of 8° with respect to the ecliptic.[1]

The body's observation arc begins with a precovery taken at Palomar in April 1954, almost two decades prior to its official discovery observation.[5]

Physical characteristics[edit]

Diameter and albedo[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Jimarnold measures 4.934 kilometers in diameter and its surface has an albedo of 0.138.[4]

Rotation period[edit]

As of 2017, no rotational lightcurve of Jimarnold has been obtained from photometric observations. The body's rotation period, poles and shape remain unknown.[1][6]


This minor planet was named after James R. Arnold (1923–2012), professor of chemistry and director of California Space Science Institute at the University of California, San Diego. Arnold's cosmochemical research included the study of cosmic radiation, the origin of meteorites, for which he developed a computer model, the lunar soil and mapping of the Moon's composition.[2]

The official naming citation was proposed by the discoverer and Eugene Shoemaker, and published by the Minor Planet Center before November 1977 (M.P.C. 4788).[7]


  1. ^ a b c d e "JPL Small-Body Database Browser: 2143 Jimarnold (1973 SA)" (2017-06-02 last obs.). Jet Propulsion Laboratory. Retrieved 6 December 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(2143) Jimarnold". Dictionary of Minor Planet Names – (2143) Jimarnold. Springer Berlin Heidelberg. p. 174. doi:10.1007/978-3-540-29925-7_2144. ISBN 978-3-540-00238-3.
  3. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 6 December 2017.
  4. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 6 December 2017.
  5. ^ a b "2143 Jimarnold (1973 SA)". Minor Planet Center. Retrieved 6 December 2017.
  6. ^ "LCDB Data for (2143) Jimarnold". Asteroid Lightcurve Database (LCDB). Retrieved 6 December 2017.
  7. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 6 December 2017.

External links[edit]