Misplaced Pages

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. The asteroid was named after American cosmochemist, James R. Arnold.

Orbit and classification

Jimarnold is a non-family asteroid from the main belt's background population. 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.

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

Physical characteristics

Diameter and albedo

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.

Rotation period

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

Naming

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. The official naming citation was proposed by the discoverer and Eugene Shoemaker, and published by the Minor Planet Center on 1 July 1979 (M.P.C. 4788).

In 2013, Arnold's son proposed that the interrobang ‽ be used as a symbol for the asteroid, reflecting his father's curiosity and his "insistence upon working with the resulting reality."

References

1. ^ "JPL Small-Body Database Browser: 2143 Jimarnold (1973 SA)" (2017-06-02 last obs.). Jet Propulsion Laboratory. Retrieved 6 December 2017.
2. ^ 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. ^ "Asteroid 2143 Jimarnold – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
4. ^ 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. ^ "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. Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.
8. Ken Arnold, "Symbol for an asteroid?", Eclectifying, 25 February 2013.

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 2143 Jimarnold at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 2143 Jimarnold at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Background asteroids
• Discoveries by Eleanor F. Helin
• Named minor planets
• Astronomical objects discovered in 1973