astro.wikisort.org - Asteroid

4760 Jia-xiang, provisional designation 1981 GN₁, is a background asteroid from the inner regions of the asteroid belt, approximately 5 kilometers (3 miles) in diameter. It was discovered on 1 April 1981, by astronomers at Harvard University's Oak Ridge Observatory in Massachusetts, United States.[1] The presumed stony S-type asteroid was named after Chinese astronomer Zhang Jiaxiang. It has a rotation period of 14.96 hours.[lower-alpha 1][lower-alpha 2]

4760 Jia-xiang

Discovery [1]
Discovered by	Harvard College Obs.
Discovery site	Oak Ridge Obs.
Discovery date	1 April 1981
Designations
MPC designation	(4760) Jia-xiang
Named after	Zhang Jiaxiang [1] (Chinese astronomer)
Alternative designations	1981 GN1 · 1981 GP1 1982 SE5
Minor planet category	main-belt [1][2] · (inner)[3] background [4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	62.47 yr (22,817 d)
Aphelion	2.6236 AU
Perihelion	2.0279 AU
Semi-major axis	2.3258 AU
Eccentricity	0.1281
Orbital period (sidereal)	3.55 yr (1,296 d)
Mean anomaly	37.063°
Mean motion	0° 16m 40.44s / day
Inclination	9.8513°
Longitude of ascending node	177.82°
Argument of perihelion	130.44°
Physical characteristics
Mean diameter	4.71 km (calculated)[3] 4.79±1.41 km[5] 5.137±0.036 km[6][7] 5.16±1.28 km[8]
Synodic rotation period	14.96±0.0006 h[lower-alpha 1][lower-alpha 2] 14.9601 h[lower-alpha 1][lower-alpha 2]
Geometric albedo	0.13±0.06[8] 0.20 (assumed)[3] 0.21±0.15[5] 0.227±0.042[6] 0.2275±0.0418[7]
Spectral type	S (assumed)[3]
Absolute magnitude (H)	13.56±0.40[9] · 13.7[7] · 13.90[5] · 14.0[2][3] · 14.29[8]

Orbit and classification

Jia-xiang is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the inner main-belt at a distance of 2.0–2.6 AU once every 3 years and 7 months (1,296 days; semi-major axis of 2.33 AU). Its orbit has an eccentricity of 0.13 and an inclination of 10° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar Observatory in January 1955, or 26 years prior to its official discovery observation at Oak Ridge.[1]

Physical characteristics

Rotation period

In 2017, two rotational lightcurves of Jia-xiang were obtained from photometric observations by Czech astronomer Petr Pravec at Ondřejov Observatory. Lightcurve analysis gave a rotation period of 14.96 and 14.9601 hours with a brightness amplitude of 0.55 and 0.63 magnitude, respectively (U=3/3).[lower-alpha 1][lower-alpha 2]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Jia-xiang measures between 4.79 and 5.16 kilometers in diameter and its surface has an albedo between 0.13 and 0.2275.[5][6][7][8]

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.20 and calculates a diameter of 4.71 kilometers based on an absolute magnitude of 14.0.[3]

Naming

This minor planet was named after Chinese astronomer Zhang Jiaxiang (born 1932).[1] The official naming citation was published by the Minor Planet Center on 21 November 1991 (M.P.C. 19339).[10]

Notes

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
• 4760 Jia-xiang at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 4760 Jia-xiang at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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