1428 Mombasa

1428 MombasaDiscovery[1]

Discovered by| C. Jackson
Discovery site| Johannesburg Obs.
Discovery date| 5 July 1937
Designations

MPC designation

| (1428) Mombasa
Named after| Mombasa (city, port)[2]

Alternative designations

| 1937 NO * 1933 WO
1949 FA * 1957 YZ
Minor planet category| main-belt * (middle)
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc| 82.74 yr (30,219 days)
|{{{apsis}}}|helion}}| 3.2039 AU
|{{{apsis}}}|helion}}| 2.4154 AU

Semi-major axis

| 2.8096 AU
Eccentricity| 0.1403
Orbital period| 4.71 yr (1,720 days)
Mean anomaly| 263.81°
Mean motion| 0° 12m 33.48s / day
Inclination| 17.305°
Longitude of ascending node| 115.72°

|{{{apsis}}}|helion}}

| 252.61°
Physical characteristics
Dimensions| 52.464±0.268 km[3]
53.35±13.28 km[4]
55.34±0.70 km[5]
56.63±2.0 km[6]
56.83 km (derived)[7]
57.59±19.41 km[8]
62.45±0.73 km[9]
127.203±29.18 km[10]
Rotation period| 16.67±0.01 h[lower-alpha 1]
17.12±0.01 h[11]
17.6±0.2 h[12]
Geometric albedo| 0.0010±0.0099[10]
0.0240±0.002[6]
0.025±0.001[5]
0.038±0.004[9]
0.04±0.04[8]
0.0415 (derived)[7]
0.06±0.06[4]

Spectral type

| SMASS = Xc[1] * P[10] * C[7]
Absolute magnitude (H)| 9.95±0.74[13] * 10.20[8][9] * 10.27[4] * 10.3[1][7] * 10.9[5][6][10]

1428 Mombasa, provisional designation 1937 NO, is a dark asteroid from the middle region of the asteroid belt, approximately 56 kilometers in diameter.

It was discovered on 5 July 1937, by English-born South African astronomer Cyril Jackson at Johannesburg Observatory, South Africa, and later named after Mombasa, Kenya.[2][14]

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 2.1 Rotation period
* 2.2 Spectral type, diameter and albedo
* 3 Naming
* 4 Notes
* 5 References
* 6 External links

## Orbit and classification

Mombasa orbits the Sun at a distance of 2.4–3.2 AU once every 4 years and 9 months (1,720 days). Its orbit has an eccentricity of 0.14 and an inclination of 17° with respect to the ecliptic.[1] Mombasa was first identified as 1933 WO at Lowell Observatory, extending the body's observation arc by 4 years prior to its official discovery at Johannesburg.[14]

## Physical characteristics

### Rotation period

American astronomer Robert Stephens obtained a rotational lightcurve of Mombasa in June 2012. Light-curve analysis gave a rotation period of 16.67 hours with a brightness variation of 0.16 magnitude ({{{1}}}).[lower-alpha 1] Previous lightcurves were obtained by French amateur astronomer René Roy in February 2006 (17.6 hours, Δ0.15 mag; {{{1}}}),[12] as well as by Scot Hawkins and Richard Ditteon at Oakley Observatory in May 2007 (17.12 hours, Δ0.25 mag; {{{1}}}).[11]

### Spectral type, diameter and albedo

## Naming

This minor planet was named after Mombasa, chief-port and second largest city of Kenya on the coast of East Africa.[2] The official naming citation was published by the Minor Planet Center in April 1953 (M.P.C. 909).[15]

## Notes

1. ↑ 1.0 1.1 Stephens (2012) web: rotation period 16.67±0.01 hours with a brightness amplitude of 0.16 mag. Notes: "A half-period of 8.38 h cannot be formally excluded". Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1428) Mombasa

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 "JPL Small-Body Database Browser: 1428 Mombasa (1937 NO)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001428. Retrieved 6 January 2017.
2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1428) Mombasa". Dictionary of Minor Planet Names – (1428) Mombasa. Springer Berlin Heidelberg. p. 115. doi:10.1007/978-3-540-29925-7_1429. ISBN 978-3-540-00238-3.
3. ↑ 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 6 January 2017.
4. ↑ 4.0 4.1 4.2 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.
5. ↑ 5.0 5.1 5.2 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)
6. ↑ 6.0 6.1 6.2 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode: 2004PDSS...12.....T. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 22 October 2019.
7. ↑ 7.0 7.1 7.2 7.3 "LCDB Data for (1428) Mombasa". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1428|Mombasa. Retrieved 6 January 2017.
8. ↑ 8.0 8.1 8.2 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T. et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal 814 (2): 13. doi:10.1088/0004-637X/814/2/117. Bibcode: 2015ApJ...814..117N. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N. Retrieved 6 January 2017.
9. ↑ 9.0 9.1 9.2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C. et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters 759 (1): 5. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 6 January 2017.
10. ↑ 10.0 10.1 10.2 10.3 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.
11. ↑ 11.0 11.1 Hawkins, Scot; Ditteon, Richard (March 2008). "Asteroid Lightcurve Analysis at the Oakley Observatory - May 2007". The Minor Planet Bulletin 35 (1): 1–4. ISSN 1052-8091. Bibcode: 2008MPBu...35....1H. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35....1H. Retrieved 6 January 2017.
12. ↑ 12.0 12.1 Behrend, Raoul. "Asteroids and comets rotation curves – (1428) Mombasa". Geneva Observatory. http://obswww.unige.ch/~behrend/page4cou.html#001428. Retrieved 6 January 2017.
13. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 6 January 2017.
14. ↑ 14.0 14.1 "1428 Mombasa (1937 NO)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1428. Retrieved 6 January 2017.
15. ↑ 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.

## External links

* Asteroid Lightcurve Database (LCDB), query form (info )
* Dictionary of Minor Planet Names, Google books
* Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
* Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
* 1428 Mombasa at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 1428 Mombasa at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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