astro.wikisort.org - Asteroid

1157 Arabia, provisional designation 1929 QC, is an asteroid from the outer regions of the asteroid belt, approximately 29 kilometers in diameter. It was discovered by astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany on 31 August 1929.[8] The asteroid was named for the Arabian Peninsula.

1157 Arabia

Discovery[1]
Discovered by	K. Reinmuth
Discovery site	Heidelberg Obs.
Discovery date	31 August 1929
Designations
MPC designation	(1157) Arabia
Named after	Arabian Peninsula[2]
Alternative designations	1929 QC · 1955 EC
Minor planet category	main-belt · (outer)[3] background[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	87.58 yr (31,987 days)
Aphelion	3.6412 AU
Perihelion	2.7221 AU
Semi-major axis	3.1816 AU
Eccentricity	0.1444
Orbital period (sidereal)	5.68 yr (2,073 days)
Mean anomaly	195.98°
Mean motion	0° 10m 25.32s / day
Inclination	9.5447°
Longitude of ascending node	336.19°
Argument of perihelion	313.37°
Physical characteristics
Dimensions	29.01±0.84 km[5] 29.113±4.433 km[6] 55.67 km (calculated)[3]
Synodic rotation period	15.225±0.005 h[lower-alpha 1]
Geometric albedo	0.057 (assumed)[3] 0.211±0.013[5] 0.247±0.242[6]
Spectral type	C (assumed)[3]
Absolute magnitude (H)	9.82[6] · 9.89±0.22[7] · 10.00[1][3][5]

Orbit and classification

Arabia is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.6 AU once every 5 years and 8 months (2,073 days). Its orbit has an eccentricity of 0.14 and an inclination of 10° with respect to the ecliptic.[1]

The body's observation arc begins at Heidelberg in December 1930, more than a year after its official discovery observation.[8]

Physical characteristics

Arabia is an assumed carbonaceous C-type asteroid,[3] while the measured albedos are rather typical for a stony composition (see below).[5][6]

Rotation period

In June 2008, a rotational lightcurve of Arabia was obtained from photometric observations by Peter Caspari at the BDI Observatory (E18) near Sydney, Australia. Lightcurve analysis gave a rotation period of 15.225 hours with a brightness amplitude of 0.37 magnitude (U=3-).[lower-alpha 1]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Arabia measures 29.01 and 29.113 kilometers in diameter and its surface has an albedo of 0.211 and 0.247, respectively.[5][6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a much larger diameter of 55.67 kilometers based on an absolute magnitude of 10.0.[3]

Naming

This minor planet was named after the Arabian Peninsula, also known as "Arabia", in Western Asia. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 108).[2]

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
• 1157 Arabia at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1157 Arabia at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (1157) Arabia

(1157) Arabia ist ein Asteroid des Hauptgürtels, der am 31. August 1929 vom deutschen Astronomen Karl Wilhelm Reinmuth in Heidelberg entdeckt wurde.

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- [en] 1157 Arabia

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[es] (1157) Arabia

(1157) Arabia es un asteroide que forma parte del cinturón de asteroides y fue descubierto por Karl Wilhelm Reinmuth el 31 de agosto de 1929 desde el observatorio de Heidelberg-Königstuhl, Alemania.

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