astro.wikisort.org - Asteroid

3181 Ahnert, provisional designation 1964 EC, is a stony Flora asteroid from the inner regions of the asteroid belt, about 8 kilometers in diameter. It was discovered by German astronomer Freimut Börngen at the Karl Schwarzschild Observatory in Tautenburg, eastern Germany, on 8 March 1964.[8]

3181 Ahnert

Discovery [1]
Discovered by	F. Börngen
Discovery site	Karl Schwarzschild Obs.
Discovery date	8 March 1964
Designations
MPC designation	(3181) Ahnert
Named after	Paul Ahnert (astronomer)[2]
Alternative designations	1964 EC · 1932 RK 1936 XJ · 1951 GC1 1964 DE · 1975 NH1 1975 RD · 1979 SC12 1979 UO4 · 1979 WD8 1979 WU1 · 1982 RE1
Minor planet category	main-belt · Flora [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	86.12 yr (31,454 days)
Aphelion	2.3743 AU
Perihelion	2.0840 AU
Semi-major axis	2.2292 AU
Eccentricity	0.0651
Orbital period (sidereal)	3.33 yr (1,216 days)
Mean anomaly	9.5372°
Mean motion	0° 17m 45.96s / day
Inclination	3.9579°
Longitude of ascending node	221.14°
Argument of perihelion	304.92°
Physical characteristics
Dimensions	7.961±0.097[4] 8.19 km (calculated)[3] 8.511±0.031 km[5] 8.57±0.24 km[6]
Geometric albedo	0.1856±0.0266[5] 0.216±0.019[4] 0.24 (assumed)[3] 0.264±0.029[6]
Spectral type	SMASS = S [1] · S [3][7]
Absolute magnitude (H)	12.40[6] · 12.6[1][3] · 12.8[5] · 12.98±0.06[7]

Orbit and classification

The S-type asteroid is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 2.1–2.4 AU once every 3 years and 4 months (1,216 days). Its orbit has an eccentricity of 0.07 and an inclination of 4° with respect to the ecliptic.[1] The first precovery was obtained at Lowell Observatory in 1931, extending the asteroid's observation arc by 33 years prior to its discovery.[8]

Physical characteristics

According to the surveys carried out by NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 8.0 and 8.6 kilometers and its surface has an albedo between 0.19 and 0.26.[4][6][5] The Collaborative Asteroid Lightcurve Link assumes an intermediate albedo of 0.24 – derived from 8 Flora, the largest member and namesake of this orbital family – and calculates a diameter of 8.2 kilometers.[3] As of 2016, the asteroid's rotation period and shape still remain unknown.

Naming

This minor planet was named after German astronomer Paul Ahnert (1897–1989), author of the annual calendar of astronomical events (German: Kalender für Sternfreunde) and a renowned astronomer among professionals and amateurs. His fields of research included the physics of the Solar System and periods of variable stars at the Sonneberg Observatory. (The minor planet 1039 Sonneberga is named after this observatory.) Publisher of several books on performing astronomical observations, he also popularized the subject of astronomy to the general public.[2] The official naming citation was published by the Minor Planet Center on 2 July 1985 (M.P.C. 9771).[9]

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
• 3181 Ahnert at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 3181 Ahnert at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (3181) Ahnert

(3181) Ahnert ist ein Asteroid des inneren Hauptgürtels, der am 8. März 1964 vom deutschen Astronomen Freimut Börngen an der Thüringer Landessternwarte in Tautenburg bei einer Helligkeit von etwa 16 mag entdeckt wurde. Nachträglich konnte der Asteroid bereits auf Aufnahmen nachgewiesen werden, die im März 1931 am Lowell-Observatorium, sowie in den Jahren 1932, 1936, 1942, 1951 und 1964 an verschiedenen anderen Sternwarten gemacht wurden.

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- [en] 3181 Ahnert

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[es] (3181) Ahnert

(3181) Ahnert es un asteroide perteneciente al cinturón de asteroides descubierto por Freimut Börngen el 8 de marzo de 1964 desde el Observatorio Karl Schwarzschild, en Tautenburg, Alemania.

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