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1429 Pemba, provisional designation 1937 NH, is a stony background asteroid from the central regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 2 July 1937, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg.[11] The asteroid was named for the Pemba Island off the coast of Tanzania.[2]
| Discovery[1] | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 2 July 1937 |
| Designations | |
| (1429) Pemba | |
Named after | Pemba Island[2] (African East coast) |
| 1937 NH · 1949 JK | |
| main-belt · (inner)[3] background[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 79.93 yr (29,193 days) |
| Aphelion | 3.4109 AU |
| Perihelion | 1.7004 AU |
| 2.5557 AU | |
| Eccentricity | 0.3347 |
| 4.09 yr (1,492 days) | |
| 207.67° | |
| 0° 14m 28.32s / day | |
| Inclination | 7.7492° |
| 47.700° | |
| 297.82° | |
| Physical characteristics | |
| Dimensions | 8.71±1.86 km[5] 9.874±0.051 km[6] 10.37 km (taken)[3] 10.371 km[7] 10.531±0.041 km[8] 10.75±0.67 km[9] |
| 20 h[10] | |
| 0.1316[3][7] 0.154±0.021[9] 0.1598±0.0235[8] 0.19±0.11[5] 0.196±0.022[6] | |
| S (assumed)[3] | |
| 12.4[1] · 12.50[8][9] · 12.74[3][5] · 12.74±0.2[7][10] | |
Pemba is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the central main-belt at a distance of 1.7–3.4 AU once every 4 years and 1 month (1,492 days). Its orbit has an eccentricity of 0.33 and an inclination of 8° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation at Johannesburg.[11]
Pemba is an assumed stony S-type asteroid.[3]
Rotation period
In September 1982, a rotational lightcurve of Pemba was obtained from photometric observations. Analysis of the fragmentary lightcurve gave a rotation period of 20 hours with a brightness amplitude of 0.3 magnitude (U=1).[10] As of 2017, no secure period has been determined.[3]
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, Pemba measures between 8.71 and 10.75 kilometers in diameter and its surface has an albedo between 0.1316 and 0.196.[5][6][7][8][9]
The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE results, that is, an albedo of 0.1316 and a diameter of 10.37 kilometers based on an absolute magnitude of 12.74.[3][7]
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This minor planet was named for the Pemba Island, Tanzania, part of the Zanzibar Archipelago, which was once under the rule of the Sultan of Zanzibar.[2] It is located off the East Coast of Africa in the Indian Ocean. The official naming citation was published by the Minor Planet Center in April 1953 (M.P.C. 909).[12]
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