Astronomy:1818 Brahms
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 15 August 1939 |
| Designations | |
| (1818) Brahms | |
| Named after | Johannes Brahms (German composer)[2] |
| 1939 PE · 1936 TF 1955 SU · 1955 TN 1955 UC · A904 RE | |
| Minor planet category | main-belt · (inner) |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 112.50 yr (41,092 days) |
| |{{{apsis}}}|helion}} | 2.5504 AU |
| |{{{apsis}}}|helion}} | 1.7770 AU |
| 2.1637 AU | |
| Eccentricity | 0.1787 |
| Orbital period | 3.18 yr (1,163 days) |
| Mean anomaly | 194.32° |
| Mean motion | 0° 18m 34.92s / day |
| Inclination | 2.9782° |
| Longitude of ascending node | 249.48° |
| 74.560° | |
| Physical characteristics | |
| Dimensions | 8±3 km (generic)[3] |
| Absolute magnitude (H) | 13.8[1] |
1818 Brahms, provisional designation 1939 PE, is an asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 15 August 1939, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.[4] The asteroid was named after composer Johannes Brahms.[2]
Orbit and classification
Brahms orbits the Sun in the inner main-belt at a distance of 1.8–2.6 AU once every 3 years and 2 months (1,163 days). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic.[1] Brahms was first identified as A904 RE at the discovering observatory in 1904, extending the body's observation arc by 35 years prior to its official discovery observation.[4]
Physical characteristics
As of 2017, Brahms effective size, albedo and spectral type, as well as its rotation period and shape remain unknown. Based on a magnitude-to-diameter conversion, its generic diameter is between 5 and 11 kilometer for an absolute magnitude of 13.8, and an assumed albedo in the range of 0.05 to 0.25.[3] Since asteroids in the inner main-belt are typically of stony rather than carbonaceous composition, with albedos of 0.20 or higher, Brahms's diameter can be estimate to measure around 6 kilometers, as the higher its albedo (reflectivity), the lower the body's diameter at a constant absolute magnitude (brightness).[3]
Naming
This minor planet is named for the German composer Johannes Brahms (1833–1897).[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3935).[5]
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1818 Brahms (1939 PE)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001818. Retrieved 8 June 2017.
- ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1818) Brahms". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 145. doi:10.1007/978-3-540-29925-7_1819. ISBN 978-3-540-00238-3.
- ↑ 3.0 3.1 3.2 "Asteroid Size Estimator". CNEOS – NASA/JPL. https://cneos.jpl.nasa.gov/tools/ast_size_est.html. Retrieved 9 November 2017.
- ↑ 4.0 4.1 "1818 Brahms (1939 PE)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1818. Retrieved 15 December 2016.
- ↑ Schmadel, Lutz D.. "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.
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
- 1818 Brahms at AstDyS-2, Asteroids—Dynamic Site
- 1818 Brahms at the JPL Small-Body Database
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