Astronomy:1879 Broederstroom
| Discovery[1] | |
|---|---|
| Discovered by | H. van Gent |
| Discovery site | Johannesburg Obs. (Leiden Southern Station) |
| Discovery date | 16 October 1935 |
| Designations | |
| (1879) Broederstroom | |
| Named after | Broederstroom (town)[2] |
| 1935 UN · 1950 AD 1950 CV · 1950 DB1 1972 RS1 · 1984 HJ2 | |
| Minor planet category | main-belt · Flora[3] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 81.46 yr (29,752 days) |
| |{{{apsis}}}|helion}} | 2.5784 AU |
| |{{{apsis}}}|helion}} | 1.9131 AU |
| 2.2458 AU | |
| Eccentricity | 0.1481 |
| Orbital period | 3.37 yr (1,229 days) |
| Mean anomaly | 85.731° |
| Mean motion | 0° 17m 34.44s / day |
| Inclination | 1.7234° |
| Longitude of ascending node | 249.98° |
| 173.96° | |
| Physical characteristics | |
| Dimensions | 7.14 km (calculated)[3] 7.444±0.235 km[4] 7.66±0.52 km[5] |
| Rotation period | 3.01555±0.00006 h[6] 3.0159±0.0115 h[7] 3.020±0.010 h[8] |
| Geometric albedo | 0.24 (assumed)[3] 0.242±0.031[4] 0.319±0.048[5] |
| S[3] | |
| Absolute magnitude (H) | 12.50[5] · 12.766±0.001 (R)[7] · 12.780±0.100 (R)[8] · 12.80[4] · 12.9[1][3] · 13.45±0.28[9] |
1879 Broederstroom, provisional designation 1935 UN, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 16 October 1935, by Dutch astronomer Hendrik van Gent at the Leiden Southern Station (081), annex to the Johannesburg Observatory in South Africa.[10] The asteroid was named after the South African village of Broederstroom.[2]
Orbit and classification
Broederstroom is a member of the Flora family. It orbits the Sun in the inner main-belt at a distance of 1.9–2.6 AU once every 3 years and 4 months (1,229 days). Its orbit has an eccentricity of 0.15 and an inclination of 2° with respect to the ecliptic.[1]
No precoveries were taken, and no prior identifications were made. The body's observation arc begins with its official discovery observation at Johannesburg in 1935.
Physical characteristics
Broederstroom has been characterized as a common stony S-type asteroid.[3]
Lightcurves
In January 2007, a rotational lightcurve obtained by Italian amateur astronomer Antonio Vagnozzi gave a well-defined rotation period of 3.01555 hours with a brightness variation of 0.11 magnitude ({{{1}}}).[6] In Spring 2014, photometry at the Palomar Transient Factory in California gave two lightcurves with a period of 3.016 and 3.02 hours and an amplitude of 0.12 magnitude ({{{1}}}).[7][8]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Broederstroom measures 7.444 and 7.66 kilometers in diameter and its surface has an albedo of 0.242 and 0.319, respectively.[4][5] The Collaborative Asteroid Lightcurve Link, assumes an albedo of 0.24 – derived from the asteroid 8 Flora, the family's principal body and namesake – and calculates a diameter of 7.14 kilometers with an absolute magnitude of 13.42.[3]
Naming
This minor planet was named after the village Broederstroom located in the North West province of South Africa. The Leiden Southern Observatory was later located near this town for 25 years until 1982.[2] The official naming citation was published by the Minor Planet Center on 8 April 1982 (M.P.C. 6833).[11]
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1879 Broederstroom (1935 UN)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001879. Retrieved 9 June 2017.
- ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1879) Broederstroom". Dictionary of Minor Planet Names – (1879) Broederstroom. Springer Berlin Heidelberg. p. 150. doi:10.1007/978-3-540-29925-7_1880. ISBN 978-3-540-00238-3.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (1879) Broederstroom". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1879%7CBroederstroom. Retrieved 11 December 2016.
- ↑ 4.0 4.1 4.2 4.3 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 11 December 2016.
- ↑ 5.0 5.1 5.2 5.3 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)
- ↑ 6.0 6.1 Behrend, Raoul. "Asteroids and comets rotation curves – (1879) Broederstroom". Geneva Observatory. http://obswww.unige.ch/~behrend/page4cou.html#001879. Retrieved 11 December 2016.
- ↑ 7.0 7.1 7.2 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W. Retrieved 11 December 2016.
- ↑ 8.0 8.1 8.2 Chang, Chan-Kao (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series 219 (2): 19. doi:10.1088/0067-0049/219/2/27. Bibcode: 2015ApJS..219...27C. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJS..219...27C. Retrieved 11 December 2016.
- ↑ 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 11 December 2016.
- ↑ "1879 Broederstroom (1935 UN)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1879. Retrieved 11 December 2016.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 11 December 2016.
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
- 1879 Broederstroom at AstDyS-2, Asteroids—Dynamic Site
- 1879 Broederstroom at the JPL Small-Body Database
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