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1818 Brahms
Discovery^[1]
Discovered by	K. Reinmuth
Discovery site	Heidelberg Obs.
Discovery date	15 August 1939
Designations
MPC designation	(1818) Brahms
Named after	Johannes Brahms (German composer)^[2]
Alternative designations	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)
Aphelion	2.5504 AU
Perihelion	1.7770 AU
Semi-major axis	2.1637 AU
Eccentricity	0.1787
Orbital period (sidereal)	3.18 yr (1,163 days)
Mean anomaly	194.32°
Mean motion	0° 18^m 34.92^s / day
Inclination	2.9782°
Longitude of ascending node	249.48°
Argument of perihelion	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

^ ^a ^b ^c ^d "JPL Small-Body Database Browser: 1818 Brahms (1939 PE)" (2017-03-14 last obs.). Jet Propulsion Laboratory. Retrieved 8 June 2017.
^ ^a ^b ^c 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.
^ ^a ^b ^c "Asteroid Size Estimator". CNEOS – NASA/JPL. Retrieved 9 November 2017.
^ ^a ^b "1818 Brahms (1939 PE)". Minor Planet Center. 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 Archived 16 December 2017 at the Wayback Machine)
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
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
1818 Brahms at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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