|
2456 Palamedes
2456 Palamedes /pæləˈmiːdiːz/ is a large Jupiter trojan from the Greek camp, approximately 90 kilometers (56 miles) in diameter. It was discovered on 30 January 1966, by astronomers at the Purple Mountain Observatory in Nanking, China.[1] The assumed C-type asteroid has a rotation period of 7.24 hours and belongs to the 50 largest Jupiter trojans.[5] It was named after Palamedes from Greek mythology.[3] Orbit and classificationPalamedes is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance (see Trojans in astronomy).[6] It is also a non-family asteroid in the Jovian background population.[7][12] It orbits the Sun at a distance of 4.7–5.5 AU once every 11 years and 7 months (4,244 days; semi-major axis of 5.13 AU). Its orbit has an eccentricity of 0.07 and an inclination of 14° with respect to the ecliptic.[4] The body's observation arc begins with a precovery taken at Palomar Observatory in February 1953, nearly 13 years prior to its official discovery observation at Nanking.[1] NamingThis minor planet was named from Greek mythology after Palamedes, the most intelligent of all the Greek commanders of the Trojan War.[3] The official naming citation was published by the Minor Planet Center on 28 January 1983 (M.P.C. 7618).[13] Physical characteristicsPalamedes is an assumed carbonaceous C-type asteroid.[5] It has an average V–I color index of 0.920±0.024, typically associated with D-type asteroid (also see table below).[5] Rotation periodIn August 1995, a rotational lightcurve of Palamedes was obtained from photometric observations by Stefano Mottola and Hans-Josef Schober using the now decommissioned Bochum 0.61-metre Telescope at ESO's La Silla Observatory in Chile. Lightcurve analysis gave a rotation period of 7.258±0.004 hours and a brightness variation of 0.05 magnitude (U=2-).[5][14] A more refined period of 7.24±0.01 hours with an amplitude of 0.27 magnitude was obtained by Robert Stephens at the Goat Mountain Astronomical Research Station (G79) in October 2009 (U=3).[5][11] Diameter and albedoAccording to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Palamedes measures between 65.92 and 99.60 kilometers in diameter and its surface has an albedo between 0.026 and 0.071.[8][9][10] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0399 and a diameter of 91.83 kilometers based on an absolute magnitude of 9.3.[5]
100+ largest Jupiter trojans
References
External links
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Index:
pl ar de en es fr it arz nl ja pt ceb sv uk vi war zh ru af ast az bg zh-min-nan bn be ca cs cy da et el eo eu fa gl ko hi hr id he ka la lv lt hu mk ms min no nn ce uz kk ro simple sk sl sr sh fi ta tt th tg azb tr ur zh-yue hy my ace als am an hyw ban bjn map-bms ba be-tarask bcl bpy bar bs br cv nv eml hif fo fy ga gd gu hak ha hsb io ig ilo ia ie os is jv kn ht ku ckb ky mrj lb lij li lmo mai mg ml zh-classical mr xmf mzn cdo mn nap new ne frr oc mhr or as pa pnb ps pms nds crh qu sa sah sco sq scn si sd szl su sw tl shn te bug vec vo wa wuu yi yo diq bat-smg zu lad kbd ang smn ab roa-rup frp arc gn av ay bh bi bo bxr cbk-zam co za dag ary se pdc dv dsb myv ext fur gv gag inh ki glk gan guw xal haw rw kbp pam csb kw km kv koi kg gom ks gcr lo lbe ltg lez nia ln jbo lg mt mi tw mwl mdf mnw nqo fj nah na nds-nl nrm nov om pi pag pap pfl pcd krc kaa ksh rm rue sm sat sc trv stq nso sn cu so srn kab roa-tara tet tpi to chr tum tk tyv udm ug vep fiu-vro vls wo xh zea ty ak bm ch ny ee ff got iu ik kl mad cr pih ami pwn pnt dz rmy rn sg st tn ss ti din chy ts kcg ve
