1428 Mombasa

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1428 Mombasa
Discovery [1]
Discovered by C. Jackson
Discovery site Johannesburg Obs.
Discovery date5 July 1937
Designations
(1428) Mombasa
Named after
 Mombasa (city, port) [2]
1937 NO ·1933 WO
1949 FA ·1957 YZ
main-belt  ·(middle)
Orbital characteristics [1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 82.74 yr (30,219 days)
Aphelion 3.2039 AU
Perihelion 2.4154 AU
2.8096 AU
Eccentricity 0.1403
4.71 yr (1,720 days)
263.81°
0° 12m 33.48s / day
Inclination 17.305°
115.72°
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]
16.67±0.01 h [a]
17.12±0.01 h [11]
17.6±0.2 h [12]
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]
SMASS = Xc [1]  · P [10]  · C [7]
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.

    Contents

    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]

    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 ( U=2+ ). [a] Previous lightcurves were obtained by French amateur astronomer René Roy in February 2006 (17.6 hours, Δ0.15 mag; U=2 ), [12] as well as by Scot Hawkins and Richard Ditteon at Oakley Observatory in May 2007 (17.12 hours, Δ0.25 mag; U=2 ). [11]

    Spectral type, diameter and albedo

    On the SMASS taxonomic scheme, Mombasa is a Xc-type, an intermediate between the carbonaceous C and X-type, while it is also described as a darker P-type asteroid. [10] According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Mombasa measures between 52.46 and 62.45 kilometers in diameter, ignoring a preliminary result of 127 km, [10] and its surface has an albedo of 0.025 and 0.06. [3] [4] [5] [6] [8] [9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0415 and a diameter of 56.83 kilometers with an absolute magnitude of 10.3. [7]

    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 2 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 2 3 4 5 "JPL Small-Body Database Browser: 1428 Mombasa (1937 NO)" (2016-08-13 last obs.). Jet Propulsion Laboratory. Archived from the original on 20 August 2020. Retrieved 6 January 2017.
    2. 1 2 3 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. 1 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. arXiv: 1406.6645 . Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. S2CID   119293330 . Retrieved 6 January 2017.
    4. 1 2 3 4 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 .
    5. 1 2 3 4 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)
    6. 1 2 3 4 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 . Retrieved 22 October 2019.
    7. 1 2 3 4 5 "LCDB Data for (1428) Mombasa". Asteroid Lightcurve Database (LCDB). Retrieved 6 January 2017.
    8. 1 2 3 4 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. arXiv: 1509.02522 . Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. S2CID   9341381 . Retrieved 6 January 2017.
    9. 1 2 3 4 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. arXiv: 1209.5794 . Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. S2CID   46350317 . Retrieved 6 January 2017.
    10. 1 2 3 4 5 6 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.
    11. 1 2 Hawkins, Scot; Ditteon, Richard (March 2008). "Asteroid Lightcurve Analysis at the Oakley Observatory - May 2007". The Minor Planet Bulletin. 35 (1): 1–4. Bibcode:2008MPBu...35....1H. ISSN   1052-8091 . Retrieved 6 January 2017.
    12. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1428) Mombasa". Geneva Observatory . 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. arXiv: 1506.00762 . Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID   53493339 . Retrieved 6 January 2017.
    14. 1 2 "1428 Mombasa (1937 NO)". Minor Planet Center. 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. Bibcode:2009dmpn.book.....S. doi:10.1007/978-3-642-01965-4. ISBN   978-3-642-01964-7.
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