1389 Onnie

1389 Onnie

Light-curve-based 3D-model of 1389 Onnie
Discovery [1]
Discovered by H. van Gent
Discovery site Johannesburg Obs.
(Leiden Southern Station)
Discovery date 28 September 1935
Designations
MPC designation 1389 Onnie
Named after
 A. Kruyt
(relative of orbit computer)[2]
1935 SS1 · 1949 QV1
1955 XB1
main-belt · Koronis [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 80.55 yr (29422 days)
Aphelion 2.9118 AU (435.60 Gm)
Perihelion 2.8179 AU (421.55 Gm)
2.8649 AU (428.58 Gm)
Eccentricity 0.016393
4.85 yr (1771.1 d)
142.48°
0° 12m 11.736s / day
Inclination 2.0480°
174.57°
297.68°
Earth MOID 1.83353 AU (274.292 Gm)
Jupiter MOID 2.0824 AU (311.52 Gm)
Jupiter Tisserand parameter 3.299
Physical characteristics
Dimensions 14.737±0.159 km[4]
12.46 km (derived)[3]
22.5 h (0.94 d)[1][5]
23.0447±0.0005 h[6]
0.1734±0.0387[4]
0.24 (assumed)[3]
B–V = 0.810
S [3]
11.64[1]

    1389 Onnie, provisional designation 1935 SS1, is a stony asteroid from the outer region of the asteroid belt, about 13 kilometers in diameter. It was discovered by Dutch astronomer Hendrik van Gent at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa, on 28 September 1935.[7]

    The S-type asteroid is a member of the Koronis family, a group consisting of about 200 known bodies. It orbits the Sun at a distance of 2.8–2.9 AU once every 4 years and 10 months (1,773 days). Its orbit is nearly circular with a very low eccentricity of 0.02 and almost coplanar to the plane of the ecliptic, tilted by only 2 degrees. It has a rather long rotation period of about 23 hours[5][6] and an albedo of 0.17, according to the survey carried out by the space-based Wide-field Infrared Survey Explorer and subsequent NEOWISE mission.[4] The Collaborative Asteroid Lightcurve Link (CALL) assumes as somewhat higher albedo of 0.24, which is more typical for a silicaceous asteroid.[3]

    The minor planet was named after A. Kruyt, sister-in-law of astronomer G. Pels (1893–1966). Pels, who proposed the minor planet's name, was as a lifelong member of the Leiden Observatory's staff, observer of minor planets at Leiden, and orbit computer for many of the discoveries made by Hendrik van Gent.[2] The minor planet 1667 Pels was named in his honour.[8]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1389 Onnie (1935 SS1)" (2015-08-02 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1389) Onnie. Springer Berlin Heidelberg. p. 112. ISBN 978-3-540-29925-7. Retrieved December 2015.
    3. 1 2 3 4 5 "LCDB Data for (1389) Onnie". Asteroid Lightcurve Database (LCDB). Retrieved December 2015.
    4. 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 December 2015.
    5. 1 2 Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus: 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035. Retrieved December 2015.
    6. 1 2 Hanus, J.; Durech, J.; Broz, M.; Warner, B. D.; Pilcher, F.; Stephens, R.; et al. (June 2011). "A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method". Astronomy & Astrophysics 530: 16. arXiv:1104.4114. Bibcode:2011A&A...530A.134H. doi:10.1051/0004-6361/201116738. Retrieved December 2015.
    7. ↑ "1389 Onnie (1935 SS1)". Minor Planet Center. Retrieved December 2015.
    8. ↑ Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1667) Pels. Springer Berlin Heidelberg. p. 132. ISBN 978-3-540-29925-7. Retrieved December 2015.

    External links


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