.png) Light curve based 3D-model ofWachmann | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 7 March 1924 |
| Designations | |
| (1704) Wachmann | |
Named after | Arno Wachmann (German astronomer)[2] |
| A924 EE · 1947 CE 1957 BJ | |
| main-belt · (inner)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 93.16 yr (34,026 days) |
| Aphelion | 2.4163AU |
| Perihelion | 2.0292 AU |
| 2.2228 AU | |
| Eccentricity | 0.0871 |
| 3.31yr (1,210 days) | |
| 67.047° | |
| 0° 17m 50.64s / day | |
| Inclination | 0.9715° |
| 259.47° | |
| 280.77° | |
| Physical characteristics | |
| Dimensions | 6.618±0.070[4] 6.934±0.070 km[5] 7.82 km(calculated)[3] |
| 3.314±0.001h[6] | |
| 0.1767±0.0133[5] 0.193±0.036[4] 0.20(assumed)[3] | |
| S[3] | |
| 12.9[1][3] · 12.97±0.13[7] · 13.3[5] | |
1704 Wachmann, provisional designationA924 EE, is a stonyasteroid from the inner regions of theasteroid belt, approximately 7 kilometers in diameter. It was discovered by German astronomerKarl Reinmuth atHeidelberg Observatory on 7 March 1924. It was later named after astronomerArno Wachmann.[2][8]
TheS-type asteroid orbits the Sun in theinner main-belt at a distance of 2.0–2.4 AU once every 3 years and 4 months (1,210 days). Its orbit has aneccentricity of 0.09 and aninclination of 1° with respect to theecliptic.[1] Noprecoveries were taken. The asteroid'sobservation arc begins 3 days after its official discovery observation.[8]
In April 2007, a rotationallightcurveWachmann was obtained at the U.S. Sandia View Observatory in New Mexico (H03). Lightcurve analysis gave a well-definedrotation period of3.314±0.001 hours with a brightness variation of 0.40magnitude (U=3).[6]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Wachmann measures 6.6 and 6.9 kilometers in diameter, and its surface has analbedo of 0.177 and 0.193, respectively,[4][5] while theCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.8 kilometers, based on anabsolute magnitude of 12.9.[3]
Thisminor planet was named forArno Wachmann (1902–1990), long-time astronomer at theBergedorf Observatory in Hamburg, discoverer of minor planets andcomets, and observer ofvariable andbinary stars. He is best known for the co-discovery of the three "Schwassmann–Wachmann" comets,29P,31P and73P.[2] The officialnaming citation was published by theMinor Planet Center on 20 February 1976 (M.P.C. 3933).[9]
