Home • Search • Translate
From Wikipedia, the free encyclopedia

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 arc79.93 yr (29,193 days)
Aphelion3.4109 AU
Perihelion1.7004 AU
2.5557 AU
Eccentricity0.3347
4.09 yr (1,492 days)
207.67 °
0° 14m 28.32s / day
Inclination7.7492°
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]

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]

References

  1. ^ a b c d "JPL Small-Body Database Browser: 1429 Pemba (1937 NH)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 26 October 2017.
  2. ^ a b c 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. ^ a b c d e f g h "LCDB Data for (1429) Pemba". Asteroid Lightcurve Database (LCDB). Retrieved 26 October 2017.
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Archived from the original on 2 August 2017. Retrieved 26 October 2017.
  5. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv: 1606.08923. Bibcode: 2016AJ....152...63N. doi: 10.3847/0004-6256/152/3/63.
  6. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv: 1406.6645. Bibcode: 2014ApJ...791..121M. doi: 10.1088/0004-637X/791/2/121. S2CID  119293330. Retrieved 26 October 2017.
  7. ^ a b c d e Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode: 2012Icar..221..365P. doi: 10.1016/j.icarus.2012.07.026. Retrieved 26 October 2017.
  8. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv: 1109.6407. Bibcode: 2011ApJ...741...90M. doi: 10.1088/0004-637X/741/2/90. S2CID  35447010.
  9. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode: 2011PASJ...63.1117U. doi: 10.1093/pasj/63.5.1117. ( online, AcuA catalog p. 153)
  10. ^ a b c Harris, A. W.; Young, J. W.; Bowell, E.; Tholen, D. J. (November 1999). "Asteroid Lightcurve Observations from 1981 to 1983". Icarus. 142 (1): 173. Bibcode: 1999Icar..142..173H. doi: 10.1006/icar.1999.6181. Retrieved 26 October 2017.
  11. ^ a b "1429 Pemba (1937 NH)". Minor Planet Center. Retrieved 26 October 2017.
  12. ^ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p.  221. Bibcode: 2009dmpn.book.....S. doi: 10.1007/978-3-642-01965-4. ISBN  978-3-642-01964-7.

External links

Retrieved from " https://en.wikipedia.org/?title=1429_Pemba&oldid=1191754706"

Top Of Page

Home • Search • Translate

© CSE