1818 Brahms

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]

1818 Brahms
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date15 August 1939
Designations
(1818) Brahms
Named after
Johannes Brahms
(German composer)[2]
1939 PE · 1936 TF
1955 SU · 1955 TN
1955 UC · A904 RE
main-belt · (inner)
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc112.50 yr (41,092 days)
Aphelion2.5504 AU
Perihelion1.7770 AU
2.1637 AU
Eccentricity0.1787
3.18 yr (1,163 days)
194.32°
0° 18m 34.92s / day
Inclination2.9782°
249.48°
74.560°
Physical characteristics
Dimensions8±3 km (generic)[3]
13.8[1]

    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. "JPL Small-Body Database Browser: 1818 Brahms (1939 PE)" (2017-03-14 last obs.). Jet Propulsion Laboratory. Retrieved 8 June 2017.
    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. "Asteroid Size Estimator". CNEOS – NASA/JPL. Retrieved 9 November 2017.
    4. "1818 Brahms (1939 PE)". Minor Planet Center. Retrieved 15 December 2016.
    5. 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.

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