Astronomy:1429 Pemba

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1429 Pemba
Discovery[1]
Discovered byC. Jackson
Discovery siteJohannesburg Obs.
Discovery date2 July 1937
Designations
(1429) Pemba
Named afterPemba Island[2]
(African East coast)
1937 NH · 1949 JK
Minor planet categorymain-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)
|{{{apsis}}}|helion}}3.4109 AU
|{{{apsis}}}|helion}}1.7004 AU
2.5557 AU
Eccentricity0.3347
Orbital period4.09 yr (1,492 days)
Mean anomaly207.67°
Mean motion0° 14m 28.32s / day
Inclination7.7492°
Longitude of ascending node47.700°
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]
Rotation period20 h[10]
Geometric albedo0.1316[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]
Absolute magnitude (H)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 ({{{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. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1429 Pemba (1937 NH)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001429. Retrieved 26 October 2017. 
  2. ↑ 2.0 2.1 2.2 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. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 "LCDB Data for (1429) Pemba". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1429%7CPemba. Retrieved 26 October 2017. 
  4. ↑ 4.0 4.1 "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action. Retrieved 26 October 2017. 
  5. ↑ 5.0 5.1 5.2 5.3 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. doi:10.3847/0004-6256/152/3/63. Bibcode: 2016AJ....152...63N. 
  6. ↑ 6.0 6.1 6.2 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. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 26 October 2017. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 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. doi:10.1016/j.icarus.2012.07.026. Bibcode: 2012Icar..221..365P. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012Icar..221..365P. Retrieved 26 October 2017. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. 
  9. ↑ 9.0 9.1 9.2 9.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  10. ↑ 10.0 10.1 10.2 Harris, A. W.; Young, J. W.; Bowell, E.; Tholen, D. J. (November 1999). "Asteroid Lightcurve Observations from 1981 to 1983". Icarus 142 (1): 173. doi:10.1006/icar.1999.6181. Bibcode: 1999Icar..142..173H. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1999Icar..142..173H. Retrieved 26 October 2017. 
  11. ↑ 11.0 11.1 "1429 Pemba (1937 NH)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1429. 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. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7. Bibcode: 2009dmpn.book.....S. https://archive.org/details/dictionaryminorp2008schm. 

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