1430 Somalia

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1430 Somalia
001430-asteroid shape model (1430) Somalia.png
Modelled shape of Somalia from its lightcurve
Discovery [1]
Discovered by C. Jackson
Discovery site Johannesburg Obs.
Discovery date5 July 1937
Designations
(1430) Somalia
Named after
Somalia [2] (African country)
1937 NK ·1929 RQ
1954 UR1 ·1957 HT
1962 VF
main-belt  ·(middle)
background [3]  · Astraea [4]
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
Dimensions8.77±1.58 km [5]
9.352±0.133 km [6]
9.44±0.36 km [7]
9.674±0.089 km [8]
10.79 km (calculated) [9]
6.90907±0.00005 h [10]
6.910±0.001 h [11]
6.913±0.001 h [12]
0.1436±0.0287 [8]
0.153±0.032 [6]
0.162±0.014 [7]
0.20 (assumed) [9]
0.31±0.14 [5]
S (assumed) [9]
12.1 [1]  ·12.2 [9]  ·12.35±0.35 [13]  ·12.41 [5]  ·12.80 [7] [8]

    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. [14] It was named for the African country of Somalia. [2]

    Contents

    Orbit and classification

    Based on the hierarchical clustering method, Somalia is a non-family asteroid of the main belt's background population (Nesvorný), [3] as well as a core member of the Astraea family (Milani and Knežević). [4] 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. [14]

    Physical characteristics

    Somalia is an assumed stony S-type asteroid. [9]

    Lightcurves

    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 ). [11] [12]

    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. [10]

    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, Somalia measures between 8.77 and 9.674 kilometers in diameter and its surface has an albedo between 0.1436 and 0.31. [5] [6] [7] [8]

    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. [9]

    Naming

    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). [15]

    Related Research Articles

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    <span class="mw-page-title-main">1132 Hollandia</span> Asteroid

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    <span class="mw-page-title-main">1457 Ankara</span> Stony asteroid from the central region of the asteroid belt

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    References

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