astro.wikisort.org - Asteroid

2571 Geisei, provisional designation 1981 UC, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered by Japanese astronomer Tsutomu Seki at Geisei Observatory on 23 October 1981, and named for the Japanese village of Geisei.[2][10]

2571 Geisei

Discovery [1]
Discovered by	T. Seki
Discovery site	Geisei Obs.
Discovery date	23 October 1981
Designations
MPC designation	(2571) Geisei
Named after	Geisei (Japanese village)[2]
Alternative designations	1981 UC · 1931 TA4 1934 NV · 1944 OD 1961 XG · 1981 WR6 A911 UC
Minor planet category	main-belt · Flora [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	85.64 yr (31,280 days)
Aphelion	2.6607 AU
Perihelion	1.7953 AU
Semi-major axis	2.2280 AU
Eccentricity	0.1942
Orbital period (sidereal)	3.33 yr (1,215 days)
Mean anomaly	317.69°
Mean motion	0° 17m 47.04s / day
Inclination	2.8722°
Longitude of ascending node	66.915°
Argument of perihelion	284.78°
Physical characteristics
Dimensions	5.21±0.95 km[4] 5.23±1.07 km[5] 6.582±0.035 km[6][7] 6.81 km (calculated)[3]
Synodic rotation period	7.823±0.005 h[8]
Geometric albedo	0.24 (assumed)[3] 0.2573±0.0688[6] 0.275±0.059[7] 0.34±0.14[4] 0.38±0.24[5]
Spectral type	S [3]
Absolute magnitude (H)	12.9[5] · 13.0[1][3][6] · 13.32±0.26[9] · 13.38[4]

Classification and Orbit

Geisei is a member of the Flora family, one of the largest families of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,215 days). Its orbit has an eccentricity of 0.19 and an inclination of 3° with respect to the ecliptic.[1]

In October 1911, Geisei was first identified as A911 UC at Heidelberg Observatory. The asteroid's observation arc begins 50 years prior to its discovery, with a precovery taken at Lowell Observatory in 1931.[10]

Physical characteristics

Lightcurves

A rotational lightcurve for this asteroid was obtained from photometric observations made at the Australian Oakley Southern Sky Observatory (E09) in September 2014. The lightcurve gave a rotation period of 7.823±0.005 hours with a brightness variation of 0.50 in magnitude (U=3-).[8]

Diameter and albedo

According to the 2015/16 NEOWISE mission results of NASA's space-based Wide-field Infrared Survey Explorer, Geisei measures 5.21 and 5.23 kilometers in diameter and its surface has an albedo of 0.34 and 0.38, respectively.[4][5] Preliminary WISE results gave a diameter of 6.582 kilometers and an albedo of 0.275.[6][7]

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 6.81 kilometers using an absolute magnitude of 13.0.[3]

Naming

This minor planet is named after the small Japanese village of Geisei, where the discovering observatory is located. Geisei is situated near the city of Kōchi, after which Tsutomu Seki's first discovery, the asteroid 2396 Kochi, is named.[2] The approved naming citation was published by the Minor Planet Center on 6 June 1982 (M.P.C. 6956).[11]

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
• 2571 Geisei at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 2571 Geisei at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (2571) Geisei

(2571) Geisei ist ein Asteroid des Hauptgürtels, der am 23. Oktober 1981 vom japanischen Astronomen Tsutomu Seki am Geisei-Observatorium entdeckt wurde.

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- [en] 2571 Geisei

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