| 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 | 3.4109AU |
| Perihelion | 1.7004 AU |
| 2.5557 AU | |
| Eccentricity | 0.3347 |
| 4.09yr (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] |
| 20h[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] | |
1429 Pemba, provisional designation1937 NH, is a stony backgroundasteroid from the central regions of theasteroid belt, approximately 10 kilometers in diameter. It was discovered on 2 July 1937, by South African astronomerCyril Jackson at theUnion Observatory in Johannesburg.[11] The asteroid was named for thePemba Island off the coast of Tanzania.[2]
Pemba is a non-family asteroid from the main belt'sbackground population.[4] It orbits the Sun in thecentral main-belt at a distance of 1.7–3.4 AU once every 4 years and 1 month (1,492 days). Its orbit has aneccentricity of 0.33 and aninclination of 8° with respect to theecliptic.[1] The body'sobservation arc begins with its official discovery observation at Johannesburg.[11]
Pemba is an assumed stonyS-type asteroid.[3]
In September 1982, a rotationallightcurve ofPemba was obtained from photometric observations. Analysis of the fragmentary lightcurve gave arotation period of 20 hours with a brightness amplitude of 0.3magnitude (U=1).[10] As of 2017, no secure period has been determined.[3]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Pemba measures between 8.71 and 10.75 kilometers in diameter and its surface has analbedo between 0.1316 and 0.196.[5][6][7][8][9]
TheCollaborative Asteroid Lightcurve Link adoptsPetr Pravec's revised WISE results, that is, an albedo of 0.1316 and a diameter of 10.37 kilometers based on anabsolute magnitude of 12.74.[3][7]
Thisminor planet was named for thePemba Island, Tanzania, part of theZanzibar Archipelago, which was once under the rule of theSultan of Zanzibar.[2] It is located off the East Coast of Africa in theIndian Ocean. The officialnaming citation was published by theMinor Planet Center in April 1953 (M.P.C. 909).[12]
