1558 Järnefelt
| Discovery [1] | |
|---|---|
| Discovered by | L. Oterma |
| Discovery site | Turku Obs. |
| Discovery date | 20 January 1942 |
| Designations | |
| MPC designation | 1558 Järnefelt |
Named after |
Gustaf Järnefelt (astronomer)[2] |
|
1942 BD · 1929 WD1 1934 VX · 1937 EF 1943 GQ · 1951 RC2 1972 BO · A913 AA | |
| main-belt (outer)[1] | |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 103.16 yr (37,678 days) |
| Aphelion | 3.3255 AU |
| Perihelion | 3.1202 AU |
| 3.2229 AU | |
| Eccentricity | 0.0318 |
| 5.79 yr (2,113 days) | |
| 37.047° | |
| 0° 10m 13.44s / day | |
| Inclination | 10.489° |
| 110.93° | |
| 291.25° | |
| Physical characteristics | |
| Dimensions |
54.98±0.56 km[3] 61.77±0.70 km[4] 65.05 km (derived)[5] 65.09±7.1 km (IRAS:6)[6] |
| 18.22±0.06 h[7] | |
|
0.0317 (derived)[5] 0.0347±0.009 (IRAS:6)[6] 0.039±0.001[4] 0.049±0.008[3] | |
| C [5] | |
|
10.2[6][4][3] 10.28±0.36[8] 10.3[1][5] | |
|
| |
1558 Järnefelt, provisional designation 1942 BD, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 65 kilometers in diameter. It was discovered on 20 January 1942, by Finnish female astronomer Liisi Oterma at Turku Observatory in Southwest Finland.[9]
The dark C-type asteroid orbits the Sun at a distance of 3.1–3.3 AU once every 5 years and 9 months (2,113 days). Its orbit has a low eccentricity of 0.03 and an inclination of 10° with respect to the plane of the ecliptic.[1] The asteroid's first identification at Heidelberg dates back to 1913 (A913 AA / 1913 AA), while its first used observation was made at Johannesburg in 1934, extending the body's observation arc by 8 years prior to its discovery.[9]
In May 2007, photometric light-curve observations for this asteroid at the U.S. Oakley Observatory, Indiana, gave a rotation period of 18.22±0.06 hours with a brightness amplitude of 0.40 in magnitude. This was the first time the asteroid's period had been measured. However, the light-curve is not fully covered by the 90 data points obtained, so the period may be wrong by about 30 percent (U=2).[5][7]
According to the space-based surveys carried out by the Infrared Astronomical Satellite (IRAS), the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid has an albedo of 0.034 to 0.049, and an estimated diameter between 55.0 and 65.1 kilometers.[6][4][3] The Collaborative Asteroid Lightcurve Link agrees with the data obtained by IRAS and derives an albedo of 0.032 and a diameter of 65.1 kilometers, based on an absolute magnitude of 10.3.[5]
The minor planet was named after Finnish astronomer and director of the Helsinki University Observatory in the post-war period, Gustaf Järnefelt (1901–1989). His research included the theory of relativity and the publication artificial satellite observations.[2] Naming citation was published before November 1977 (M.P.C. 3930).[10]
References
- 1 2 3 4 5 "JPL Small-Body Database Browser: 1558 Jarnefelt (1942 BD)" (2016-03-05 last obs.). Jet Propulsion Laboratory. Retrieved 25 May 2016.
- 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1558) Järnefelt. Springer Berlin Heidelberg. p. 123. ISBN 978-3-540-00238-3. Retrieved 25 May 2016.
- 1 2 3 4 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794
. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 25 May 2016. - 1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 25 May 2016.
- 1 2 3 4 5 6 "LCDB Data for (1558) Jarnefelt". Asteroid Lightcurve Database (LCDB). Retrieved 25 May 2016.
- 1 2 3 4 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 25 May 2016.
- 1 2 Hawkins, Scot; Ditteon, Richard (March 2008). "Asteroid Lightcurve Analysis at the Oakley Observatory - May 2007". The Minor Planet Bulletin. 35 (1): 1–4. Bibcode:2008MPBu...35....1H. ISSN 1052-8091. Retrieved 25 May 2016.
- ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 25 May 2016.
- 1 2 "1558 Jarnefelt (1942 BD)". Minor Planet Center. Retrieved 25 May 2016.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 May 2016.
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
- 1558 Järnefelt at the JPL Small-Body Database
