astro.wikisort.org - Asteroid

Hilda (minor planet designation: 153 Hilda) is a large asteroid in the outer main belt, with a diameter of 170 km.[1] Because it is composed of primitive carbonaceous materials, it has a very dark surface. It was discovered by Johann Palisa on 2 November 1875, from the Austrian Naval Observatory at Pula, now Croatia.[1] The name was chosen by the astronomer Theodor von Oppolzer, who named it after one of his daughters.[4]

153 Hilda

Star field showing Hilda (apmag 14.2)
Discovery[1]
Discovered by	J. Palisa
Discovery site	Austrian Naval Obs.
Discovery date	2 November 1875
Designations
MPC designation	(153) Hilda
Pronunciation	/ˈhɪldə/[2]
Alternative designations	A875 VC; 1935 GD
Minor planet category	Main belt (Hilda)
Adjectives	Hildian /ˈhɪldiən/[3]
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	121.05 yr (44215 d)
Aphelion	4.5341 AU (678.29 Gm)
Perihelion	3.4225 AU (512.00 Gm)
Semi-major axis	3.9783 AU (595.15 Gm)
Eccentricity	0.13971
Orbital period (sidereal)	7.94 yr (2898.3 d)
Mean anomaly	51.690°
Mean motion	0° 7m 27.156s / day
Inclination	7.8249°
Longitude of ascending node	228.16°
Argument of perihelion	38.617°
Jupiter MOID	0.569657 AU (85.2195 Gm)
TJupiter	3.023
Physical characteristics
Dimensions	170.63±3.3 km[1]
Mass	~5.2×1018 kg
Equatorial escape velocity	~ 6 m/s
Synodic rotation period	5.9587 h (0.24828 d)[1]
Geometric albedo	0.0618±0.002[1]
Spectral type	C
Absolute magnitude (H)	7.48[1]

Orbit and family

Hilda gives its name to an asteroid group called the Hilda group (or Hildas for short). It is not a true asteroid family, since the members are not physically related, but rather share similar orbital elements. The Hildas are locked in a 2:3 orbital resonance with Jupiter;[5] since Jupiter takes 11.9 years to orbit the Sun while Hilda takes 7.9 years,[1] Jupiter orbits the Sun twice for every 3 orbits that Hilda completes. There are over 1,100 other objects known to be in a 2:3 resonance with Jupiter.[5]

Notes

References

External links

• The triangle formed by the Hilda asteroids EasySky
• 153 Hilda at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 153 Hilda at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (153) Hilda

(153) Hilda ist ein Asteroid des äußeren Asteroiden-Hauptgürtels, der am 2. November 1875 von Johann Palisa entdeckt wurde. Benannt wurde der Himmelskörper zum Gedenken an die älteste Tochter des Astronomen Theodor von Oppolzer[1], die ein Jahr zuvor verstorben war.

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- [en] 153 Hilda

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[es] (153) Hilda

(153) Hilda es un asteroide perteneciente al cinturón exterior de asteroides descubierto el 2 de noviembre de 1875 por Johann Palisa desde el observatorio de Pula, Croacia.[2] Está nombrado en honor de una hija del astrónomo austriaco Theodor von Oppolzer (1841-1886).[3]

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[fr] (153) Hilda

(153) Hilda est un grand astéroïde de la ceinture principale extérieure, d'un diamètre de 170 km. Il se compose de chondrites carbonées primitives qui donnent à sa surface un aspect très sombre. Il a été découvert par Johann Palisa le 2 novembre 1875 à l'observatoire naval autrichien à Pula. Son nom fut choisi par l'astronome Theodor von Oppolzer en l'honneur d'une de ses filles[2].

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[ru] (153) Хильда

(153) Хильда (нем. Hilda) — является одним из крупнейших астероидов внешней части главного пояса, с диаметром около 170 км. Это тёмный астероид довольно редкого спектрального класса P, поверхность которого богата простейшими углеродсодержащими соединениями  (англ.) (рус.. Хильда имеет очень малую амплитуду кривой блеска, что указывает на сферическую форму астероида. Его открыл 2 ноября 1875 года австрийский астроном Иоганн Пализа и назвал в честь дочери другого австрийского астронома Теодора Оппольцера[1].

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