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9165 Raup, provisional designation 1987 SJ₃, is a stony Hungaria asteroid and exceptionally slow rotator from the inner regions of the asteroid belt, approximately 4.7 kilometers in diameter.

It was discovered on 27 September 1987, by American astronomer couple Carolyn and Eugene Shoemaker at the U.S. Palomar Observatory in California. The asteroid was later named after American paleontologist David M. Raup.

Classification and orbit

Raup is a bright S-type asteroid is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun in the innermost main-belt at a distance of 1.8–2.2 AU once every 2 years and 10 months (1,022 days). Its orbit has an eccentricity of 0.10 and an inclination of 25° with respect to the ecliptic.

It was first identified as 1955 BF₁ at the discovering observatory in 1955, extending the body's observation arc by 32 years prior to its official discovery observation.

Physical characteristics

Slow rotator

In September 2015, a rotational lightcurve of Raup was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Station in Colorado. It gave a well-defined rotation period of 1320±10 hours with a brightness variation of 1.34 magnitude (U=3-).

As of 2016, it is the 3rd slowest rotating minor planet in the Light Curve Data Base (LCDB). Also, the lightcurve's high amplitude indicates that the body has a non-spheroidal shape. Brian Warner's 2015-observation supersedes a previously obtained lightcurve that gave a significantly shorter period of 560±25 hours with an amplitude of 1.05 magnitude (U=2).

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Raup measures 4.8 kilometers in diameter and its surface has a high albedo of 0.329, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for Hungaria asteroids of 0.30, and calculates a diameter of 4.6 kilometers, based on an absolute magnitude of 13.6.

Naming

This minor planet was named in honor of American David M. Raup (1933–2015), paleontologist and expert of the fossil record at UChicago. Raup's theories contributed to the knowledge of extinction events and suggested, that the extinction of dinosaurs was part of a cycle of mass extinctions. the official naming citation was published on 23 November 1999 (M.P.C. 36947).

References

1. ^ "JPL Small-Body Database Browser: 9165 Raup (1987 SJ3)" (2017-05-02 last obs.). Jet Propulsion Laboratory. Retrieved 5 July 2017.
2. ^ Schmadel, Lutz D. (2007). "(9165) Raup". Dictionary of Minor Planet Names – (9165) Raup. Springer Berlin Heidelberg. p. 681. doi:10.1007/978-3-540-29925-7_7397. ISBN 978-3-540-00238-3.
3. ^ "9165 Raup (1987 SJ3)". Minor Planet Center. Retrieved 13 September 2016.
4. ^ "LCDB Data for (9165) Raup". Asteroid Lightcurve Database (LCDB). Retrieved 13 September 2016.
5. ^ Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 13 September 2016.
6. ^ Warner, Brian D. (July 2014). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 January-March". The Minor Planet Bulletin. 41 (3): 144–155. Bibcode:2014MPBu...41..144W. ISSN 1052-8091. Retrieved 13 September 2016.
7. ^ Warner, Brian D. (April 2016). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 October-December". The Minor Planet Bulletin. 43 (2): 137–140. Bibcode:2016MPBu...43..137W. ISSN 1052-8091. Retrieved 13 September 2016.
8. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 13 September 2016.

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 (5001)-(10000) – Minor Planet Center
• 9165 Raup at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 9165 Raup at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Hungaria asteroids
• Discoveries by Carolyn S. Shoemaker
• Discoveries by Eugene Merle Shoemaker
• Named minor planets
• Slow rotating minor planets
• Astronomical objects discovered in 1987