1429 Pemba

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1429 Pemba
Discovery [1]
Discovered by C. Jackson
Discovery site Johannesburg Obs.
Discovery date2 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
Dimensions8.71±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]

    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]

    Contents

    Orbit and classification

    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]

    Physical characteristics

    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]

    Naming

    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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    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1429 Pemba (1937 NH)" (2017-06-05 last obs.). Jet Propulsion Laboratory . Retrieved 26 October 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(1429) Pemba". Dictionary of Minor Planet Names – (1429) Pemba. Springer Berlin Heidelberg. p. 115. doi:10.1007/978-3-540-29925-7_1430. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 6 7 8 "LCDB Data for (1429) Pemba". Asteroid Lightcurve Database (LCDB). Retrieved 26 October 2017.
    4. 1 2 "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Archived from the original on 2 August 2017. Retrieved 26 October 2017.
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    11. 1 2 "1429 Pemba (1937 NH)". Minor Planet Center. Retrieved 26 October 2017.
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