astro.wikisort.org - Asteroid

866 Fatme (prov. designation: A917 DG or 1917 BQ) is a large background asteroid, approximately 86 kilometers (53 miles) in diameter, located in the outer region of the asteroid belt. It was discovered by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory on 25 February 1917.[1] The X-type asteroid has a short rotation period of 5.8 hours. It was named after "Fatme", a character in the opera Abu Hassan by Carl Maria von Weber (1786–1826).[2]

866 Fatme

Discovery [1]
Discovered by	M. F. Wolf
Discovery site	Heidelberg Obs.
Discovery date	25 February 1917
Designations
MPC designation	(866) Fatme
Named after	Fatme, a character in the opera Abu Hassan (Carl Maria von Weber)[2]
Alternative designations	A917 DG · 1950 DF1 1917 BQ
Minor planet category	main-belt [1][3] · (outer) background [4][5]
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc	102.93 yr (37,596 d)
Aphelion	3.2871 AU
Perihelion	2.9606 AU
Semi-major axis	3.1238 AU
Eccentricity	0.0523
Orbital period (sidereal)	5.52 yr (2,017 d)
Mean anomaly	34.544°
Mean motion	0° 10m 42.6s / day
Inclination	8.6616°
Longitude of ascending node	91.060°
Argument of perihelion	263.20°
Physical characteristics
Mean diameter	78.061±0.360 km[6][7] 86.49±1.16 km[8] 88.31±2.0 km[9]
Synodic rotation period	5.800±0.002 h[10]
Geometric albedo	0.038±0.001[8] 0.046±0.007[6][7] 0.0473±0.002[9]
Spectral type	SMASS = X [3]
Absolute magnitude (H)	9.50[1][3]

Orbit and classification

Fatme is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5] It orbits the Sun in the outer asteroid belt at a distance of 3.0–3.3 AU once every 5 years and 6 months (2,017 days; semi-major axis of 3.12 AU). Its orbit has an eccentricity of 0.05 and an inclination of 9° with respect to the ecliptic.[3] The body's observation arc begins at Heidelberg Observatory on 16 March 1917, or three weeks after its official discovery observation.[1]

Naming

This minor planet was named after Fatme, a character in the opera Abu Hassan by German composer Carl Maria von Weber (1786–1826). The official naming was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 85).[2] Another asteroid 865 Zubaida, was also named after a character of this opera. The composer himself was honored with the naming of 4152 Weber.

Physical characteristics

In the Bus–Binzel SMASS classification, Fatme is an X-type asteroid.[3]

Rotation period

In June 2018, a rotational lightcurve of Fatme was obtained from 5 nights of photometric observations by Tom Polakis at the Command Module Observatory (V02) in Arizona. Lightcurve analysis gave a rotation period of 5.800±0.002 hours with a brightness variation of 0.21±0.02 magnitude (U=2).[10] The result supersedes previously reported period determinations of 20.03±0.01 hours with an amplitude of 0.21±0.05 magnitude by Robert Stephens at the Santana Observatory (646), California, in May 2001 (U=2),[11] 9.4±0.2 hours with an amplitude of 0.06±0.01 magnitude (tentative) by French amateur astronomer Laurent Bernasconi in December 2004 (U=1),[12] 9.36±0.05 hours with an amplitude of 0.06±0.01 magnitude (tentative) by French amateur astronomer René Roy in May 2012 (U=2−),[12] and 20.7±0.1 hours with an amplitude of 0.12±0.02 magnitude by the Spanish group of asteroid observers, OBAS, in January 2016 (U=2−).[13]

Diameter and albedo

According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Japanese Akari satellite, and the Infrared Astronomical Satellite IRAS, Fatme measures (78.061±0.360), (86.49±1.16) and (88.31±2.0) kilometers in diameter and its surface has an albedo of (0.046±0.007), (0.038±0.001) and (0.0473±0.002), respectively.[6][7][9][8] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0361 and a diameter of 88.11 kilometers based on an absolute magnitude of 9.5.[14] Alternative mean-diameter measurements published by the WISE team include (82.388±1.055 km), (88.25±26.33 km) and (95.83±37.32 km) with corresponding albedos of (0.0412±0.0096), (0.04±0.03) and (0.03±0.02).[5][14]

References

External links

• Lightcurve Database Query (LCDB), at www.minorplanet.info
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 866 Fatme at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 866 Fatme at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (866) Fatme

(866) Fatme ist ein Asteroid des Hauptgürtels, der am 25. Februar 1917 vom deutschen Astronomen Max Wolf in Heidelberg entdeckt wurde.

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- [en] 866 Fatme

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[ru] (866) Фатме

(866) Фатме (лат. Fatme) — астероид главного пояса, принадлежащий к спектральному классу X. Астероид был открыт 25 февраля 1917 года немецким астрономом Максом Вольфом в обсерватории Гейдельберг.

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