_Somalia.png) Modelled shape ofSomalia from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 5 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 | 3.0674AU |
| Perihelion | 2.0508 AU |
| 2.5591 AU | |
| Eccentricity | 0.1986 |
| 4.09yr (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[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±0.001h[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 designation1937 NK, is a stony backgroundasteroid from the central regions of theasteroid belt, approximately 10 kilometers in diameter. It was discovered on 5 July 1937, by astronomerCyril Jackson at theUnion Observatory in Johannesburg.[14] It was named for the African country ofSomalia.[2]
Based on thehierarchical clustering method,Somalia is a non-family asteroid of the main belt'sbackground population (Nesvorný),[3] as well as a core member of theAstraea family (Milani and Knežević).[4] It orbits the Sun in thecentral asteroid belt at a distance of 2.1–3.1 AU once every 4 years and 1 month (1,495 days). Its orbit has aneccentricity of 0.20 and aninclination of 3° with respect to theecliptic.[1]
The asteroid was first identified as1929 RQ atSimeiz orLowell observatories in September 1929. The body'sobservation arc begins with its official discovery observation at Johannesburg in 1937.[14]
Somalia is an assumed stonyS-type asteroid.[9]
In 2011, two rotationallightcurves ofSomalia were obtained from photometric observations by French amateur astronomerRené Roy, and by astronomers at theBassano Bresciano Observatory (565) in Italy. Lightcurve analysis gave arotation period of 6.910 and 6.913 hours with a brightness amplitude of 0.40 and 0.45magnitude, 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°) inecliptic coordinates.[10]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Somalia measures between 8.77 and 9.674 kilometers in diameter and its surface has analbedo between 0.1436 and 0.31.[5][6][7][8]
TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 10.79 kilometers based on anabsolute magnitude of 12.2.[9]
Thisminor planet was named after the country ofSomalia, located in theHorn of Africa.[2] The official naming citation was published by theMinor Planet Center on 1 February 1980 (M.P.C. 5181).[15]
