1542 Schalén
| Discovery [1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Observatory |
| Discovery date | 26 August 1941 |
| Designations | |
| MPC designation | 1542 Schalén |
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 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 117.43 yr (42890 days) |
| Aphelion | 3.4506 AU (516.20 Gm) |
| Perihelion | 2.7343 AU (409.05 Gm) |
| 3.0925 AU (462.63 Gm) | |
| Eccentricity | 0.11581 |
| 5.44 yr (1986.3 d) | |
| 248.65° | |
| 0° 10m 52.464s / day | |
| Inclination | 2.7663° |
| 211.66° | |
| 164.15° | |
| Earth MOID | 1.73442 AU (259.466 Gm) |
| Jupiter MOID | 2.01066 AU (300.790 Gm) |
| Jupiter Tisserand parameter | 3.212 |
| Physical characteristics | |
| Dimensions |
45.19 km 48.998±0.480 km[4] 45.09 km (derived)[3] |
Mean radius | 22.595 ± 0.8 km |
| 7.516 h (0.3132 d)[1][5] | |
|
0.0509±0.0105[4] 0.0548 (derived)[3] 0.0656±0.005[1] | |
|
SMASS = D D [3] | |
| 10.5 | |
|
| |
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
- 1 2 3 4 "JPL Small-Body Database Browser: 1542 Schalen (1941 QE)" (2015-08-01 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2016.
- 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1542) Schalén. Springer Berlin Heidelberg. p. 122. ISBN 978-3-540-29925-7. Retrieved 25 November 2015.
- 1 2 3 4 5 "LCDB Data for (1542) Schalen". Asteroid Lightcurve Database (LCDB). Retrieved 25 November 2015.
- 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407
. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 25 November 2015. - 1 2 Li, Bin; Zhao, Haibin; Han, Xianming L.; Klinglesmith, Daniel A. III; Hanowell, Jesse (April 2013). "Photometric Observation of 1542 Schalen". The Minor Planet Bulletin. 40 (2): 68–69. Bibcode:2013MPBu...40...68L. ISSN 1052-8091. Retrieved 25 November 2015.
- ↑ "1542 Schalen (1941 QE)". Minor Planet Center. Retrieved 25 November 2015.
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
