astro.wikisort.org - Asteroid

39382 Opportunity, also designated 2696 P-L, is a dark Hilidan asteroid from the outermost region of the asteroid belt, approximately 7.5 kilometers in diameter. Discovered during the Palomar–Leiden survey at Palomar Observatory in 1960, it was named for NASA's Opportunity Mars rover.[2]

39382 Opportunity

Discovery [1]
Discovered by	C. J. van Houten I. van Houten-G. T. Gehrels
Discovery site	Palomar Obs.
Discovery date	24 September 1960
Designations
MPC designation	(39382) Opportunity
Named after	Opportunity (rover) (Mars Exploration Rover)[2]
Alternative designations	2696 P-L
Minor planet category	main-belt · (outer)[1] · Hildian [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	56.34 yr (20,579 days)
Aphelion	4.7586 AU
Perihelion	3.1642 AU
Semi-major axis	3.9614 AU
Eccentricity	0.2012
Orbital period (sidereal)	7.88 yr (2,880 days)
Mean anomaly	56.818°
Mean motion	0° 7m 30s / day
Inclination	2.9017°
Longitude of ascending node	129.01°
Argument of perihelion	297.44°
Jupiter MOID	0.5914 AU
TJupiter	3.0210
Physical characteristics
Dimensions	7 km (generic at 0.05)[4] 7.453±2.290 km[5]
Geometric albedo	0.061±0.016[5]
Absolute magnitude (H)	14.5[1]

Discovery

Opportunity was discovered on 24 September 1960, by Dutch astronomer couple Ingrid and Cornelis van Houten, as well as Dutch–American astronomer Tom Gehrels from photographic plates taken at the Palomar Observatory, California, United States.[3]

Survey designation

The survey designation "P-L" stands for "Palomar–Leiden", named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of several thousand minor planets.[6]

Orbit and classification

Located in the outermost part of the main-belt, Opportunity is a member of the Hilda family, a large group of asteroids that are thought to have originated from the Kuiper belt. They orbit in a 3:2 orbital resonance with the gas giant Jupiter, meaning that for every 2 orbits Jupiter completes around the Sun, a Hildian asteroid will complete 3 orbits.[1]

Opportunity orbits the Sun at a distance of 3.2–4.8 AU once every 7 years and 11 months (2,880 days). Its orbit has an eccentricity of 0.20 and an inclination of 3° with respect to the ecliptic.[1] The asteroid's orbit does not cross the path of any of the planets and therefore it will not be pulled out of orbit by Jupiter's gravitational field. As a result of this, it is likely that the asteroid will remain in a stable orbit for thousands of years.

The body's observation arc begins with its official discovery observation, as no precoveries were taken and no prior identifications were made.[3]

Physical characteristics

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Opportunity measures 7.45 kilometers in diameter and its surface has an albedo of 0.061,[5] which is typical for carbonaceous asteroids. A generic magnitude-to-diameter conversion, gives a diameter of 7 kilometers, for an absolute magnitude of 14.5 and an assumed albedo of 0.05.[4]

Lightcurves

As of 2017, the asteroid's composition, shape and rotation period remain unknown.[1][7]

Naming

This minor planet was named after a Mars Exploration Rover, Opportunity, following a proposal by the discoverer Ingrid van Houten-Groeneveld.[2] The approved naming citation was published by the Minor Planet Center on 28 September 2004 (M.P.C. 52770).[8] The minor planet 37452 Spirit was named for Opportunity's twin rover, Spirit.

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 39382 Opportunity at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 39382 Opportunity at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (39382) Opportunity

(39382) Opportunity ist ein Asteroid des äußeren Hauptgürtels, der am 24. September 1960 von dem niederländischen Astronomenehepaar Cornelis Johannes van Houten und Ingrid van Houten-Groeneveld entdeckt wurde. Die Entdeckung geschah im Rahmen des Palomar-Leiden-Surveys, bei dem von Tom Gehrels mit dem 120-cm-Oschin-Schmidt-Teleskop des Palomar-Observatoriums aufgenommene Feldplatten an der Universität Leiden durchmustert wurden.

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- [en] 39382 Opportunity

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[ru] (39382) Оппортьюнити

(39382) Оппортьюнити (англ. Opportunity; первоначально — 2696 PL) — небольшой тёмный астероид внешней части главного пояса, входящий в семейство Хильды. Имеет диаметр около 7,5 км. Открыт в рамках Паломар-лейденской программы в Паломарской обсерватории 24 сентября 1960 года. Первоначально астероид получил обозначение 2696 PL, однако затем его переименовали в (39382) Оппортьюнити — в честь марсохода программы Mars Exploration Rover космического агентства NASA — «Оппортьюнити»[4].

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