| Minorplanet: | yes |
| 1617 Alschmitt | |
| Background: |
|
| Discovered: | 20 March 1952 |
| Mpc Name: | (1617) Alschmitt |
| Alt Names: | 1952 FB 1935 ER1941 HH 1947 LS 1975 AJA906 DC |
| Epoch: | 4 September 2017 (JD 2458000.5) |
| Uncertainty: | 0 |
| Observation Arc: | 111.18 yr (40,607 days) |
| Perihelion: | 2.7913 AU |
| Semimajor: | 3.1999 AU |
| Eccentricity: | 0.1277 |
| Period: | 5.72 yr (2,091 days) |
| Mean Motion: | / day |
| Inclination: | 13.265° |
| Asc Node: | 154.96° |
| Arg Peri: | 24.216° |
| Dimensions: | km km 36.78 km |
| Rotation: | h h h |
| Albedo: | 0.057 |
| Abs Magnitude: | 10.410.80 10.9 |
1617 Alschmitt, provisional designation, is an assumed carbonaceous asteroid from in the outer parts of the main belt, approximately 30 kilometers in diameter. It was discovered on 20 March 1952, by French astronomer Louis Boyer at Algiers Observatory in Algeria, Northern Africa, and named after French astronomer Alfred Schmitt.
This asteroid orbits the Sun in the outer main-belt at a distance of 2.8–3.6 AU once every 5 years and 9 months (2,091 days). Its orbit has an eccentricity of 0.13 and an inclination of 13° with respect to the ecliptic. Alschmitt was first identified as at Heidelberg in 1906, extending the body's observation arc by 46 years prior to its official discovery observation.
Alschmitt is a presumed carbonaceous C-type asteroid.
Two rotational lightcurve of Alschmitt obtained in 2003 and 2004, by René Roy and Laurent Bernasconi, gave a well-defined rotation period of 7.0613 and 7.062 hours with a brightness variation of 0.39 and 0.52 in magnitude, respectively . In October 2010, the Palomar Transient Factory derived a period of 7.0602 hours with an amplitude 0.49 magnitude .
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Alschmitt measures 21.12 and 21.28 kilometers in diameter, and its surface has an albedo of 0.190 and 0.270, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 36.78 kilometers using an absolute magnitude of 10.9.
Boyer named this minor planet for his colleague Alfred Schmitt (1907–1973), astronomer at Algiers, Strasbourg and Quito observatories, who, 20 years earlier, had named the asteroid 1215 Boyer in his honor. The official was published by the Minor Planet Center on 1 August 1978 .