Top Qs
Timeline
Chat
Perspective
1867 Deiphobus
Jupiter trojan asteroid From Wikipedia, the free encyclopedia
Remove ads
1867 Deiphobus /diːˈɪfəbəs/ is a dark Jupiter trojan from the Trojan camp, approximately 123 kilometers (76 mi) 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.[3] 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.[5]
Remove ads
Orbit and classification
Deiphobus is a dark Jovian asteroid orbiting in the trailing Trojan camp at Jupiter's L5 Lagrangian point, 60° behind its orbit in a 1:1 resonance . It is a member of the Ennomos family (009),[8] a small Jovian asteroid family with 30 known members, named after 4709 Ennomos.[19]: 23 There only a few Jovian families known to date. The Ennomos family was first identified by Jakub Rozehnal and Miroslav Brož in 2011.[20] 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.[4] The body's observation arc begins with its official discovery observation at Leoncito in March 1971.[1]
Remove ads
Physical characteristics
Summarize
Perspective
Deiphobus is characterized as a dark D-type asteroid in the Tholen, Barucci, Tedesco, as well as in the SDSS-based taxonomy.[8][15]
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=2).[5][18] 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 58.66±0.18 hours with a brightness variation of 0.27±0.03 magnitude (U=3-).[5][13]
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-),[12][14][a] and superseding other reported periods from fragmentary lightcurves (U=2/1).[21][b]
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.[9][10][11] 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.[5]
100+ largest Jupiter trojans
Remove ads
Naming
This minor planet was named after the Trojan warrior, Deiphobus, son of King Priam (also see 108 Hecuba and 884 Priamus).[3] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3935).[22]
Notes
References
External links
Wikiwand - on
Seamless Wikipedia browsing. On steroids.
Remove ads