1542 Schalén
| Discovery [1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Observatory |
| Discovery date | 26 August 1941 |
| Designations | |
| MPC designation | 1542 Schalen |
|
Named after
|
Karl Schalén (astronomer)[2] |
| 1941 QE · 1927 BH 1936 UL · 1940 LP 1976 CA · A898 VD A924 NA |
|
| main-belt · Themis [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 116.71 yr (42,628 days) |
| Aphelion | 3.4502 AU |
| Perihelion | 2.7366 AU |
| 3.0934 AU | |
| Eccentricity | 0.1153 |
| 5.44 yr (1,987 days) | |
| 176.08° | |
| Inclination | 2.7652° |
| 211.66° | |
| 164.20° | |
| Physical characteristics | |
| Dimensions | 45.19 km 48.998±0.480 km[4] 45.09 km (derived)[3] |
| 7.516 h[5] | |
| 0.0656 0.0509±0.0105[4] 0.0548 (derived)[3] |
|
| SMASS = D D [3] |
|
| 10.5 | |
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1542 Schalén, provisional designation 1941 QE, is a dark and reddish asteroid from the outer region of the asteroid belt, about 45 kilometers in diameter. It was discovered on 26 August 1941, by Finnish astronomer Yrjö Väisälä at Turku Observatory in the southwestern parts of Finland.[6]
The asteroid is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits.[3] It has a D-type spectrum, which is more commonly found among Hildian asteroids and Jupiter trojans. Bodies with a D-type spectra are thought to have originated in the Kuiper belt.
It orbits the Sun at a distance of 2.7–3.5 AU once every 5 years and 5 months (1,987 days). Its orbit shows an eccentricity of 0.12 and is tilted by 3 degrees to the plane of the ecliptic. It has a rotation period of 7.5 hours[5] and an albedo of 0.07, as observed by the Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission.[4]
The minor planet was named in honour of Swedish astronomer Karl Schalén (1902–1993), who was a director of the Swedish Lund Observatory.[2]
References
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<references />, or <references group="..." />External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- 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
- 1542 Schalén at the JPL Small-Body Database
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