1558 Järnefelt

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)
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 103.11 yr (37,662 days)   
Aphelion 3.3268 AU
Perihelion 3.1202 AU
3.2235 AU
Eccentricity 0.0320
5.79 yr (2,114 days)
2.8684°
0° 10m 12.72s / day
Inclination 10.487°
110.93°
291.36°
Physical characteristics
Dimensions 65.09±7.1 km (IRAS:6)[3]
61.77±0.70 km[4]
54.98±0.56 km[5]
65.05 km (derived)[6]
18.22±0.06 h[7]
0.0347±0.009 (IRAS:6)[3]
0.039±0.001[4]
0.049±0.008[5]
0.0317 (derived)[6]
C [6]
10.3[1][6]
10.2[3][4][5]
10.28±0.36[8]

    1558 Järnefelt, provisional designation 1942 BD, is a large carbonaceous asteroid from the outer region of the asteroid belt, about 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 (2,114 days). Its orbit has a low eccentricity of 0.03 and an inclination of 10° with respect to the plane of the ecliptic.[1]

    In 2007, a photometric light-curve observation 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).[6][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.[3][4][5] The Collaborative Asteroid Lightcurve Link (CALL) agrees with the data from IRAS, and derives an albedo of 0.032 and a diameter of 65.1 kilometers.[6]

    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 satellites observations.[2]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1558 Jarnefelt (1942 BD)" (2016-02-18 last obs.). Jet Propulsion Laboratory. Retrieved March 2016.
    2. 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 March 2016.
    3. 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 March 2016.
    4. 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 March 2016.
    5. 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 March 2016.
    6. 1 2 3 4 5 6 "LCDB Data for (1558) Jarnefelt". Asteroid Lightcurve Database (LCDB). Retrieved March 2016.
    7. 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 March 2016.
    8. ↑ 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 March 2016.
    9. ↑ "1558 Jarnefelt (1942 BD)". Minor Planet Center. Retrieved March 2016.

    External links


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