| Minorplanet: | yes |
| 1818 Brahms | |
| Background: |
|
| Discovered: | 15 August 1939 |
| Mpc Name: | (1818) Brahms |
| Alt Names: | 1939 PE1936 TF 1955 SU1955 TN 1955 UCA904 RE |
| Named After: | Johannes Brahms |
| Epoch: | 4 September 2017 (JD 2458000.5) |
| Uncertainty: | 0 |
| Observation Arc: | 112.50 yr (41,092 days) |
| Perihelion: | 1.7770 AU |
| Semimajor: | 2.1637 AU |
| Eccentricity: | 0.1787 |
| Period: | 3.18 yr (1,163 days) |
| Mean Motion: | / day |
| Inclination: | 2.9782° |
| Asc Node: | 249.48° |
| Arg Peri: | 74.560° |
| Dimensions: | km |
| Abs Magnitude: | 13.8 |
1818 Brahms, provisional designation, 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. The asteroid was named after composer Johannes Brahms.
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. Brahms was first identified as at the discovering observatory in 1904, extending the body's observation arc by 35 years prior to its official discovery observation.
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. Since asteroids in the inner main-belt are typically of stony rather than carbonaceous composition, with albedos of 0.20 or higher, Brahmss 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).
This minor planet is named for the German composer Johannes Brahms (1833–1897). The official was published by the Minor Planet Center on 20 February 1976 .