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词条 1468 Zomba
释义

  1. Discovery

  2. Orbit and classification

  3. Physical characteristics

      Rotation period    Diameter and albedo  

  4. Naming

  5. Notes

  6. References

  7. External links

{{Infobox planet
| minorplanet = yes
| name = 1468 Zomba
| background = #FA8072
| image =
| image_size =
| caption =
| discovery_ref =  
| discoverer = C. Jackson
| discovery_site = Johannesburg Obs.
| discovered = 23 July 1938
| mpc_name = (1468) Zomba
| alt_names = 1938 PA
| pronounced =
| named_after = Zomba {{small|(Malawian city)}}[2]
| mp_category = Mars-crosser [4][5]
| orbit_ref =  
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 78.47 yr (28,660 days)
| aphelion = 2.7913 AU
| perihelion = 1.5998 AU
| semimajor = 2.1956 AU
| eccentricity = 0.2713
| period = 3.25 yr (1,188 days)
| mean_anomaly = 95.275°
| mean_motion = {{Deg2DMS|0.3030|sup=ms}} / day
| inclination = 9.9388°
| asc_node = 308.93°
| arg_peri = 23.188°
| dimensions = {{val|6.97|1.39}} km[7]
8.57 km {{small|(calculated)}}[5]
| rotation = {{val|2.769|0.005}} h[9]{{efn|name=lightcurve-plot-Warner}}
{{val|2.77}} h[10]
{{val|2.772|0.006}} h[11]
{{val|2.773|0.001}} h[12]
| albedo = 0.20 {{small|(assumed)}}[5]
{{val|0.302|0.121}}[7]
| spectral_type = Q [15]{{·}}S {{small|(assumed)}}[5]
| abs_magnitude = 12.70[5][7]{{·}}{{val|13.05|0.45}}[15]
}}1468 Zomba, provisional designation {{mp|1938 PA}}, is a stony asteroid and large Mars-crosser near the innermost regions of the asteroid belt, approximately 7 kilometers in diameter. Discovered by Cyril Jackson at Johannesburg Observatory in 1938, the asteroid was named after the city of Zomba in the Republic of Malawi.[4]

Discovery

Zomba was discovered on 23 July 1938, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg, South Africa.[4] It was independently discovered by French astronomer Louis Boyer at the Algiers Observatory, Algeria, on 2 August 1938,[2] who first announce the asteroid's discovery. The Minor Planet Center (MPC) only recognizes the first discoverer.[4]

Orbit and classification

Zomba is a Mars-crossing asteroid, a dynamically unstable group between the main belt and the near-Earth populations, crossing the orbit of Mars at 1.666 AU. It orbits the Sun at a distance of 1.6–2.8 AU once every 3 years and 3 months (1,188 days). Its orbit has an eccentricity of 0.27 and an inclination of 10° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Johannesburg.[4]

Physical characteristics

Zomba has been characterized as a Q-type asteroid by Pan-STARRS photometric survey.[15] The Lightcurve Data Base assumes it to be a common S-type asteroid.[5]

Rotation period

Several rotational lightcurves of Zomba have been obtained from photometric observations. Lightcurve analysis gave a consolidated rotation period of 2.773 hours with a brightness amplitude between 0.3 and 0.36 magnitude ({{small|U=3-/2/3/3}}).[9][10][11][12]{{efn|name=lightcurve-plot-Warner}}

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Zomba measures 6.97 kilometers in diameter and its surface has an albedo of 0.302,[7] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.57 kilometers based on an absolute magnitude of 12.7.[5]

This makes Zomba one of the largest mid-sized Mars-crossing asteroids comparable with 1065 Amundsenia (9.75 km), 1139 Atami (9.35 km), 1474 Beira (8.73 km), 1011 Laodamia (7.39 km), 1727 Mette (est 9 km), 1131 Porzia (7.13 km), 1235 Schorria (est. 9 km), 985 Rosina (8.18 km) and 1310 Villigera (15.24 km), but far smaller than the largest members of this dynamical group, namely, 132 Aethra, 323 Brucia, 1508 Kemi, 2204 Lyyli and 512 Taurinensis, which are all larger than 20 kilometers in diameter.

Naming

This minor planet was named after the town of Zomba in the Republic of Malawi, known as Nyasaland, a British protectorate, at the time of naming. The official naming citation was published by the MPC before November 1977 ({{small|M.P.C. 909}}).[36]

Notes

{{notelist|refs={{efn|name=lightcurve-plot-Warner|1=Lightcurve plot of (1468) Zomba, Brian Warner (2015),Palmer Divide Station, California. Rotation period {{val|2.769|0.005}} hours with a brightness amplitude of {{val|0.33}} mag. Quality code of 3-ä. Summary figures at the LCDB}}

}}

References

1. ^1 2 {{cite book |title = Dictionary of Minor Planet Names – (1468) Zomba |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 117 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1469 |chapter = (1468) Zomba }}
2. ^1 2 3 4 5 {{cite web |title = 1468 Zomba (1938 PA) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=1468 |accessdate = 20 October 2017}}
3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 20 October 2017}}
4. ^1 2 3 4 5 6 7 {{cite web |title = LCDB Data for (1468) Zomba |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1468%7CZomba |accessdate = 20 October 2017}}
5. ^1 2 3 4 {{Cite journal |first1 = V. |last1 = Alí-Lagoa |first2 = M. |last2 = Delbo' |date = July 2017 |title = Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data |url = https://www.aanda.org/articles/aa/pdf/2017/07/aa29917-16.pdf |journal = Astronomy and Astrophysics |volume = 603 |page = 8 |bibcode = 2017A&A...603A..55A |doi = 10.1051/0004-6361/201629917 |arxiv = 1705.10263 |access-date= 20 October 2017}}
6. ^1 2 {{Cite journal |first1 = W. Z. |last1 = Wisniewski |first2 = R. S. |last2 = McMillan |date = May 1987 |title = Differential CCD photometry of faint asteroids in crowded star fields and nonphotometric sky conditions |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1987AJ.....93.1264W |journal = Astronomical Journal |volume = 93 |pages = 1264–1267 |issn = 0004-6256 |bibcode = 1987AJ.....93.1264W |doi = 10.1086/114408 |access-date= 20 October 2017}}
7. ^1 2 {{Cite journal |author = Alkema, Michael S. |date = January 2014 |title = Asteroid Lightcurve Analysis at Elephant Head Observatory: 2013 August- October |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41...40A |journal = The Minor Planet Bulletin |volume = 41 |issue = 1 |page = 40 |issn = 1052-8091 |bibcode = 2014MPBu...41...40A |access-date= 20 October 2017}}
8. ^1 2 {{Cite journal |author = Benishek, Vladimir |date = April 2014 |title = Rotation Period Determination for 1425 Tuorla, 1468 Zomba, 1486 Marilyn, 2112 Ulyanov, and (101158) 2000 OL |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..126B |journal = The Minor Planet Bulletin |volume = 41 |issue = 2 |pages = 126–127 |issn = 1052-8091 |bibcode = 2014MPBu...41..126B |access-date= 20 October 2017}}
9. ^1 2 {{Cite journal |author = Warner, Brian D. |date = July 2015 |title = Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 December - 2015 March |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42..167W |journal = The Minor Planet Bulletin |volume = 42 |issue = 3 |pages = 167–172 |issn = 1052-8091 |bibcode = 2015MPBu...42..167W |access-date= 20 October 2017}}
10. ^1 2 3 {{cite journal |display-authors = 6 |first1 = Peter |last1 = Veres |first2 = Robert |last2 = Jedicke |first3 = Alan |last3 = Fitzsimmons |first4 = Larry |last4 = Denneau |first5 = Mikael |last5 = Granvik |first6 = Bryce |last6 = Bolin |first7 = Serge |last7 = Chastel |first8 = Richard J. |last8 = Wainscoat |first9 = William S. |last9 = Burgett |first10 = Kenneth C. |last10 = Chambers |first11 = Heather |last11 = Flewelling |first12 = Nick |last12 = Kaiser |first13 = Eugen A. |last13 = Magnier |first14 = Jeff S. |last14 = Morgan |first15 = Paul A. |last15 = Price |first16 = John L. |last16 = Tonry |first17 = Christopher |last17 = Waters |date = November 2015 |title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762 |access-date= 20 October 2017}}
[1][2][3][4][5][6][7][8][9][10]

}}

External links

  • Asteroid Lightcurve Database (LCDB), query form (info)
  • [https://books.google.com/books?id=aeAg1X7afOoC&pg 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
  • {{JPL small body}}
{{Minor planets navigator |1467 Mashona |number=1468 |1469 Linzia}}{{Small Solar System bodies}}{{DEFAULTSORT:Zomba}}

5 : Mars-crossing asteroids|Discoveries by Cyril V. Jackson|Minor planets named for places|Named minor planets|Astronomical objects discovered in 1938
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