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4805 Asteropaios /ˌæstərəˈpeɪəs/ is a Jupiter trojan from the Trojan camp, approximately 53 kilometers (33 miles) in diameter. It was discovered on 13 November 1990, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. The dark Jovian asteroid is one of the 80 largest Jupiter trojans and has a rotation period of 12.4 hours. It was named after the spear-throwing hero Asteropaios, from Greek mythology.

Orbit and classification

Asteropaios is a dark Jovian asteroid orbiting in the trailering Trojan camp at Jupiter's L₅ Lagrangian point, 60° behind on the Gas Giant's orbit in a 1:1 resonance (see Trojans in astronomy). It is also a non-family asteroid of the Jovian background population.

It orbits the Sun at a distance of 4.7–5.7 AU once every 11 years and 11 months (4,343 days; semi-major axis of 5.21 AU). Its orbit has an eccentricity of 0.09 and an inclination of 12° with respect to the ecliptic. The body's observation arc begins with a precovery taken at Palomar in December 1953, almost 37 years prior to its official discovery observation.

Physical characteristics

Asteropaios is an assumed, carbonaceous C-type asteroid.

Rotation period

In February 1994, a rotational lightcurve of Asteropaios was obtained from photometric observations by Stefano Mottola and Anders Erikson using the former ESO 1-metre telescope at La Silla Observatory in Chile. Lightcurve analysis gave a well-defined rotation period of 12.372±0.010 hours with a brightness amplitude of 0.26 magnitude (U=3).

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Asteropaios measures 43.44 and 57.65 kilometers in diameter and its surface has an albedo of 0.085 and 0.058, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 53.16 kilometers based on an absolute magnitude of 10.1.

Naming

This minor planet was named from Greek mythology after Asteropaios, commander of the Trojan-allied Paeonians during the Trojan War. The ambidextrous, spear-throwing warrior was able to draw blood from Achilles but was slain in the combat. The official naming citation was published by the Minor Planet Center on 27 June 1991 (M.P.C. 18466).

References

1. ^ "4805 Asteropaios (1990 VH7)". Minor Planet Center. Retrieved 16 June 2018.
2. 'Asteropæus' in Noah Webster (1884) A Practical Dictionary of the English Language, modified for the spelling -ai-
3. ^ "JPL Small-Body Database Browser: 4805 Asteropaios (1990 VH7)" (2018-05-24 last obs.). Jet Propulsion Laboratory. Retrieved 16 June 2018.
4. "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 16 June 2018.
5. ^ "Asteroid (4805) Asteropaios – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 16 June 2018.
6. ^ Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
7. ^ Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. S2CID 119101711. (online catalog)
8. ^ Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170.
9. ^ "LCDB Data for (4805) Asteropaios". Asteroid Lightcurve Database (LCDB). Retrieved 16 June 2018.
10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 16 June 2018.

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• Asteroid 4805 Asteropaios at the Small Bodies Data Ferret
• 4805 Asteropaios at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 4805 Asteropaios at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Jupiter trojans (Trojan camp)
• Discoveries by Carolyn S. Shoemaker
• Named minor planets
• Astronomical objects discovered in 1990