1691 Oort

1691 Oort

Light-curve-based 3D-model of 1691 Oort
Discovery [1]
Discovered by K. Reinmuth
I. Groeneveld
Discovery site Heidelberg Obs.
Discovery date 9 September 1956
Designations
MPC designation 1691 Oort
Named after
 Jan Oort
(astronomer)[2]
1956 RB · 1945 TD
1947 DA · 1950 PZ
1950 RU · 1951 XW
1955 MW · 1956 SD
1964 DA · A917 TD
main-belt · Themis [3]
Orbital characteristics [1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 69.66 yr (25,443 days)
Aphelion 3.7160 AU
Perihelion 2.6216 AU
3.1688 AU
Eccentricity 0.1726
5.64 yr (2,060 days)
99.783°
Inclination 1.0824°
174.47°
233.13°
Physical characteristics
Dimensions 37.37±0.74 km[4]
33.163±0.534 km[5]
27.13 km (caculated)[3]
10.2705 h[6]
10.2684±0.0005 h[7]
0.053±0.002[4]
0.0672±0.0150[5]
0.10 (assumed)[3]
B–V = 0.682
U–B = 0.316
Tholen = CU [1]
C [3]
10.95

    1691 Oort, provisional designation 1956 RB, is a dark asteroid from the outer region of the asteroid belt, roughly 30 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth and Dutch astronomer Ingrid van Houten-Groeneveld at Heidelberg Observatory in south-west Germany on 9 September 1956.[8]

    The carbonaceous C-type asteroid, classified as CU-type in the Tholen taxonomy, orbits the Sun at a distance of 2.6–3.7 AU once every 5 years and 8 months (2,060 days). Its orbit shows an eccentricity of 0.17 and is nearly coplanar to the plane of the ecliptic, with an orbital inclination of only 1 degree.[1] It has a well-defined rotation period of 10.27 hours[6][7] and an albedo of 0.05–0.07 determined by the Akari and WISE/NEOWISE surveys.[4][5]

    It was named in honor of Dutch astronomer Jan Oort (1900–1992), director of the Leiden Observatory (1945–1970), president of the International Astronomical Union (1958–1961), and a well-known authority on stellar statistics and galactic structure.[2] He overturned the idea that the Sun was at the center of the Milky Way. The Oort cloud, the outermost gravitationally bound region of the Solar System, was also named after him.

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1691 Oort (1956 RB)" (2015-06-13 last obs.). Jet Propulsion Laboratory. Retrieved November 2015.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1691) Oort. Springer Berlin Heidelberg. p. 134. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 3 4 "LCDB Data for (1691) Oort". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 1 2 3 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 November 2015.
    5. 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 November 2015.
    6. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1691) Oort". Geneva Observatory. Retrieved November 2015.
    7. 1 2 Hanus, J.; Broz, M.; Durech, J.; Warner, B. D.; Brinsfield, J.; Durkee, R.; et al. (November 2013). "An anisotropic distribution of spin vectors in asteroid families". Astronomy & Astrophysics 559: 19. arXiv:1309.4296. Bibcode:2013A&A...559A.134H. doi:10.1051/0004-6361/201321993. Retrieved November 2015.
    8. ↑ "1691 Oort (1956 RB)". Minor Planet Center. Retrieved November 2015.

    External links


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