2308 Schilt

2308 Schilt
Discovery [1]
Discovered by C. U. Cesco
A. R. Klemola
Discovery site El Leoncito · CYSS
Discovery date 6 May 1967
Designations
MPC designation 2308 Schilt
Named after
 Jan Schilt (astronomer)[2]
1967 JM · 1926 GP
1930 DR · 1972 TX7
1976 UH12 · 1980 VF
1981 YM
main-belt · Eunomia [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 81.90 yr (29,913 days)     
Aphelion 2.9859 AU
Perihelion 2.1114 AU
2.5487 AU
Eccentricity 0.1715
4.07 yr (1,486 days)
332.46°
0° 14m 32.012s / day
Inclination 14.175°
34.268°
233.52°
Physical characteristics
Dimensions 17.54±0.8 km (IRAS:18)[1]
17.626±0.220 km[4]
17.51 km (derived)[3]
13.79±0.57 km[5]
9.759±0.002 h[6]
9.767±0.005 h[lower-alpha 1]
0.1094±0.011 (IRAS:18)[1]
0.1088±0.0335[4]
0.1001 (derived)[1]
0.177±0.024[5]
SMASS = S[3]
S [3]
11.9[1]
11.8[4][5]

    2308 Schilt, provisional designation 1967 JM, is a stony Eunomia asteroid from the asteroid belt, approximately 17 kilometers in diameter. It was discovered on 6 May 1967, by Argentine astronomer Carlos Cesco together with American astronomer Arnold Klemola at the Yale–Columbia Southern Station at Leoncito Astronomical Complex in Argentina.[7]

    The asteroid is a member of the Eunomia family, a large group of S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,486 days). Its orbit has an eccentricity of 0.17 and an inclination of 14° with respect to the ecliptic.[1] The first precovery was obtained in 1921 at Heidelberg Observatory. The asteroids observation arc begins in 1967, due to precoveries made at the discovering observatory in Argentina.[7]

    A rotational light-curve was obtained based on photometric observations at the Australian Oakley Southern Sky Observatory in August 2012. The light-curve showed a period of 9.759±0.002 hours with a brightness amplitude of 0.44 in magnitude (U=3).[6] A previous observation by Argentine astronomer Salvador Mazzone at the Observatorio Astronómico Salvador gave a similar period of 9.767±0.005 with an amplitude of 0.42 in magnitude (U=3-).[lower-alpha 1]

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 13.8 and 17.6 kilometers in diameter and its surface has an albedo in the range of 0.10–0.17.[1][4][5] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.10 and a diameter of 17.5 kilometers.[3]

    The minor planet was named after Dutch–American astronomer and one of the founders of the Columbia–Yale Southern Station in the early 1960s, Jan Schilt (1894–1982). At Columbia University, his field of research included the dynamics and structure of galaxies. He also improved on measuring the brightness of stars.[2][8]

    References

    1. 1 2 Mazzone (2012) web: rotation period 9.767±0.005 hours with a brightness amplitude of 0.42 mag and an LCDB quality code of U=3-. See www.astrosurf.com/salvador/Fotometria.html. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (2308) Schilt
    1. 1 2 3 4 5 6 7 8 "JPL Small-Body Database Browser: 2308 Schilt (1967 JM)" (2016-01-29 last obs.). Jet Propulsion Laboratory. Retrieved April 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2308) Schilt. Springer Berlin Heidelberg. p. 188. ISBN 978-3-540-00238-3. Retrieved April 2016.
    3. 1 2 3 4 5 "LCDB Data for (2308) Schilt". Asteroid Lightcurve Database (LCDB). Retrieved April 2016.
    4. 1 2 3 4 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 April 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 April 2016.
    6. 1 2 Simpson, Gary; Chong, Elena; Gerhardt, Michael; Gorsky, Sean; Klaasse, Matthew; Kodalen, Brian; et al. (July 2013). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2012 August - October". The Minor Planet Bulletin 40 (3): 146–151. Bibcode:2013MPBu...40..146S. ISSN 1052-8091. Retrieved April 2016.
    7. 1 2 "2308 Schilt (1967 JM)". Minor Planet Center. Retrieved April 2016.
    8. ↑ "Schilt, Jan". The Biographical Encyclopedia of Astronomers. Springer Publishing. 2014. pp. 1939–1940. ISBN 978-0-387-31022-0. Retrieved April 2016.

    External links


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