1157 Arabia

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1157 Arabia
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 31 August 1929
MPC designation (1157) Arabia
Named after
Arabian Peninsula[2]
1929 QC · 1955 EC
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
3.1816 AU
Eccentricity 0.1444
5.68 yr (2,073 days)
0° 10m 25.32s / day
Inclination 9.5447°
Physical characteristics
Dimensions 29.01±0.84 km[5]
29.113±4.433 km[6]
55.67 km (calculated)[3]
15.225±0.005 h[a]
0.057 (assumed)[3]
C (assumed)[3]
9.82[6] · 9.89±0.22[7] · 10.00[1][3][5]

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.

Orbit and classification[edit]

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[edit]

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[edit]

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-).[a]

Diameter and albedo[edit]

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]


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]


  1. ^ a b Peter Caspari (2008) Minor Planet Lightcurve Analysis of 1157 Arabia and 1836 Komarov. Summary figures for (1157) Arabia at the LCDB


  1. ^ a b c d "JPL Small-Body Database Browser: 1157 Arabia (1929 QC)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 27 September 2017. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1157) Arabia. Springer Berlin Heidelberg. p. 98. ISBN 978-3-540-00238-3. Retrieved 27 September 2017. 
  3. ^ a b c d e f g "LCDB Data for (1157) Arabia". Asteroid Lightcurve Database (LCDB). Retrieved 27 September 2017. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 27 September 2017. 
  5. ^ a b c d e Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 27 September 2017. 
  6. ^ a b c d e Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 27 September 2017. 
  7. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 27 September 2017. 
  8. ^ a b "1157 Arabia (1929 QC)". Minor Planet Center. Retrieved 27 September 2017. 

External links[edit]