1157 Arabia

1157 ArabiaDiscovery[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)
|{{{apsis}}}|helion}}| 3.6412 AU
|{{{apsis}}}|helion}}| 2.7221 AU

Semi-major axis

| 3.1816 AU
Eccentricity| 0.1444
Orbital period| 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°

|{{{apsis}}}|helion}}

| 313.37°
Physical characteristics
Dimensions| 29.01±0.84 km[5]
29.113±4.433 km[6]
55.67 km (calculated)[3]
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]

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

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 2.1 Rotation period
* 2.2 Diameter and albedo
* 3 Naming
* 4 Notes
* 5 References
* 6 External links

## 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, Peter Caspari obtained a rotational lightcurve of Arabia from photometric observations 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 ({{{1}}}).[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

1. ↑ 1.0 1.1 Peter Caspari (2008) Minor Planet Lightcurve Analysis of 1157 Arabia and 1836 Komarov. Summary figures for (1157) Arabia at the LCDB

## References

1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1157 Arabia (1929 QC)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001157. Retrieved 27 September 2017.
2. ↑ 2.0 2.1 Schmadel, Lutz D. (2007). "(1157) Arabia". Dictionary of Minor Planet Names – (1157) Arabia. Springer Berlin Heidelberg. p. 98. doi:10.1007/978-3-540-29925-7_1158. ISBN 978-3-540-00238-3.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (1157) Arabia". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1157|Arabia. Retrieved 27 September 2017.
4. ↑ 4.0 4.1 "Asteroid 1157 Arabia – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1157.
5. ↑ 5.0 5.1 5.2 5.3 5.4 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U. (online, AcuA catalog p. 153)
6. ↑ 6.0 6.1 6.2 6.3 6.4 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 27 September 2017.
8. ↑ 8.0 8.1 "1157 Arabia (1929 QC)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1157. Retrieved 27 September 2017.

## External links

* Asteroid Lightcurve Database (LCDB), query form (info )
* 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

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