1867 Deiphobus

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1867 Deiphobus Template:IPAc-en is a dark Jupiter trojan from the Trojan camp, approximately Script error: No such module "convert". in diameter. It was discovered on 3 March 1971, by Argentine astronomers Carlos Cesco and A. G. Samuel at the Leoncito Astronomical Complex in Argentina,[1] and later named after the Trojan prince Deiphobus from Greek mythology.[2] The dark D-type asteroid is one of the largest Jupiter trojans. It is a member of the Ennomos family and has a long rotation period of 58.66 hours.[3]

Orbit and classification

Deiphobus is a dark Jovian asteroid orbiting in the trailing Trojan camp at Jupiter's Template:L5 Lagrangian point, 60° behind its orbit in a 1:1 resonance Template:Crossreference. It is a member of the Ennomos family (009),[4] a small Jovian asteroid family with 30 known members, named after 4709 Ennomos.[5]Template:Rp There only a few Jovian families known to date. The Ennomos family was first identified by Jakub Rozehnal and Miroslav Brož in 2011.[6] However, a different HCM-based analysis assigns Deiphobus to the Jovian background population.[7]

It orbits the Sun at a distance of 4.9–5.4 AU once every 11 years and 7 months (4,241 days; semi-major axis of 5.13 AU). Its orbit has an eccentricity of 0.04 and an inclination of 27° with respect to the ecliptic.[8] The body's observation arc begins with its official discovery observation at Leoncito in March 1971.[1]

Physical characteristics

Template:JPL SBDB Jupiter Trojans

Deiphobus is characterized as a dark D-type asteroid in the Tholen, Barucci, Tedesco, as well as in the SDSS-based taxonomy.[4][9]

Lightcurves

Several rotational lightcurve have been obtained since 1987, when the first photometric observations of Deiphobus by Linda French at CTIO indicated that the body has longer-than average rotation period of at least 24 hours.(U=2Script error: No such module "Check for unknown parameters".).[3][10] In February 1994, observations by Stefano Mottola and Anders Erikson, using the ESO 1-metre telescope at La Silla Observatory in Chile, gave a slow rotation period of Script error: No such module "val". hours with a brightness variation of Script error: No such module "val". magnitude (U=3-Script error: No such module "Check for unknown parameters".).[3][11]

Since 2015, follow-up observations by Robert Stephens at the Center for Solar System Studies measured 58.62 and 58.699, confirming Mottola's long period (U=3-/3-Script error: No such module "Check for unknown parameters".),[12][13]Template:Efn and superseding other reported periods from fragmentary lightcurves (U=2/1Script error: No such module "Check for unknown parameters".).[14]Template:Efn

While not being a slow rotator, Deiphobus has a much longer rotation period than the vast majority of asteroids, which typically rotate between 2 and 20 hours once around their axis. Among all large Jovian asteroids, only 617 Patroclus has a longer period than Deiphobus.

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Deiphobus measures between 118.22 and 131.31 kilometers in diameter, and its surface has an albedo between 0.037 and 0.060.[15][16][17] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0396 and a diameter of 122.65 kilometers based on an absolute magnitude of 8.68.[3]

Template:Largest Jupiter trojans

Naming

This minor planet was named after the Trojan warrior, Deiphobus, son of King Priam (also see 108 Hecuba and 884 Priamus).[2] The official Template:MoMP was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3935Script error: No such module "Check for unknown parameters".).[18]

Notes

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References

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  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "Citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1". (PDS data set)
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1". (online catalog)
  16. ↑ Script error: No such module "Citation/CS1".
  17. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
  18. ↑ Script error: No such module "citation/CS1".

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External links

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