1430 Somalia

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1430 Somalia
Discovery [1]
Discovered by C. Jackson
Discovery site Johannesburg Obs.
Discovery date 5 July 1937
Designations
MPC designation (1430) Somalia
Named after
Somalia[2](African country)
1937 NK · 1929 RQ
1954 UR1 · 1957 HT
1962 VF
main-belt · (middle)
background [3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 79.73 yr (29,122 days)
Aphelion 3.0674 AU
Perihelion 2.0508 AU
2.5591 AU
Eccentricity 0.1986
4.09 yr (1,495 days)
184.53°
0° 14m 26.88s / day
Inclination 3.2883°
327.25°
351.42°
Physical characteristics
Dimensions 8.77±1.58 km[4]
9.352±0.133 km[5]
9.44±0.36 km[6]
9.674±0.089 km[7]
10.79 km (calculated)[8]
6.90907±0.00005 h[9]
6.910±0.001 h[10]
6.913±0.001 h[11]
0.1436±0.0287[7]
0.153±0.032[5]
0.162±0.014[6]
0.20 (assumed)[8]
0.31±0.14[4]
S (assumed)[8]
12.1[1] · 12.2[8] · 12.35±0.35[12] · 12.41[4] · 12.80[6][7]

1430 Somalia, provisional designation 1937 NK, is a stony background asteroid from the central regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 5 July 1937, by astronomer Cyril Jackson at the Union Observatory in Johannesburg.[13] It was named for the African country of Somalia.[2]

Orbit and classification[edit]

Somalia is a non-family asteroid of the main belt's background population.[3] It orbits the Sun in the central asteroid belt at a distance of 2.1–3.1 AU once every 4 years and 1 month (1,495 days). Its orbit has an eccentricity of 0.20 and an inclination of 3° with respect to the ecliptic.[1]

The asteroid was first identified as 1929 RQ at Simeiz or Lowell observatories in September 1929. The body's observation arc begins with its official discovery observation at Johannesburg in 1937.[13]

Physical characteristics[edit]

Somalia is an assumed stony S-type asteroid.[8]

Lightcurves[edit]

In 2011, two rotational lightcurves of Somalia were obtained from photometric observations by French amateur astronomer René Roy, and by astronomers at the Bassano Bresciano Observatory (565) in Italy. Lightcurve analysis gave a rotation period of 6.910 and 6.913 hours with a brightness amplitude of 0.40 and 0.45 magnitude, respectively (U=3-/3).[10][11]

In 2016, a modeled lightcurve was derived from various photometric database sources, giving a concurring sidereal period of 6.90907 hours. The modelled lightcurve also determined two spin axis of (297.0°, 42.0°) and (128.0°, 47.0°) in ecliptic coordinates.[9]

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, Somalia measures between 8.77 and 9.674 kilometers in diameter and its surface has an albedo between 0.1436 and 0.31.[4][5][6][7]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 10.79 kilometers based on an absolute magnitude of 12.2.[8]

Naming[edit]

This minor planet was named after the country of Somalia, located in the Horn of Africa.[2] The official naming citation was published by the Minor Planet Center on 1 February 1980 (M.P.C. 5181).[14]

References[edit]

  1. ^ a b c d "JPL Small-Body Database Browser: 1430 Somalia (1937 NK)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 26 October 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1430) Somalia. Springer Berlin Heidelberg. p. 115. ISBN 978-3-540-00238-3. Retrieved 26 October 2017. 
  3. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 26 October 2017. 
  4. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923Freely accessible. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 26 October 2017. 
  5. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 26 October 2017. 
  6. ^ a b c d 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 26 October 2017. 
  7. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 26 October 2017. 
  8. ^ a b c d e f "LCDB Data for (1430) Somalia". Asteroid Lightcurve Database (LCDB). Retrieved 26 October 2017. 
  9. ^ a b Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network" (PDF). Astronomy and Astrophysics. 586: 24. arXiv:1510.07422Freely accessible. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. Retrieved 26 October 2017. 
  10. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1430) Somalia". Geneva Observatory. Retrieved 26 October 2017. 
  11. ^ a b Strabla, Luca; Quadri, Ulisse; Girelli, Roberto (July 2012). "Lightcurve Analysis for Eight Minor Palnets at Bassano Bresciano Observatory". The Minor Planet Bulletin. 39 (3): 177–179. Bibcode:2012MPBu...39..177S. ISSN 1052-8091. Retrieved 26 October 2017. 
  12. ^ 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 26 October 2017. 
  13. ^ a b "1430 Somalia (1937 NK)". Minor Planet Center. Retrieved 26 October 2017. 
  14. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 October 2017. 

External links[edit]