1796 Riga

1796 Riga
Discovery [1]
Discovered by N. Chernykh
Discovery site CrAO - Nauchnyj
Discovery date 16 May 1966
Designations
MPC designation 1796 Riga
Named after
 Riga
(capital city)[2]
1966 KB · 1935 GE
1941 FC1 · 1947 GA
1950 TF2 · 1953 GW
1960 JA · A907 TG
A907 UD
main-belt (outer)
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 62.40 yr (22792 days)
Aphelion 3.5453 AU (530.37 Gm)
Perihelion 3.1648 AU (473.45 Gm)
3.3551 AU (501.92 Gm)
Eccentricity 0.056710
6.15 yr (2244.7 d)
46.524°
0° 9m 37.368s / day
Inclination 22.585°
186.73°
25.022°
Earth MOID 2.17203 AU (324.931 Gm)
Jupiter MOID 1.42465 AU (213.125 Gm)
Jupiter Tisserand parameter 3.031
Physical characteristics
Dimensions 73.83 km[3]
85.79±1.57 km[4]
68.089±1.037 km[5]
71±7 km[6]
Mean radius
 36.915 ± 0.9 km
10.608 h[7]
11.0±0.01 h[8]
16 h[9]
22.226 h (0.9261 d)[1]
0.0376[3]
0.028±0.001[4]
0.0442±0.0082[5]
0.04±0.01[6]
0.0376 ± 0.002[1]
B–V = 0.676
U–B = 0.289
XFCU (Tholen)
Cb (SMASS)
C [10]
9.84

    1796 Riga, provisional designation 1966 KB, is a dark asteroid from the outer region of the asteroid belt, about 74 kilometers in diameter. It was discovered by Russian astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnyj on 16 May 1966.[11]

    The carbonaceous asteroid is classified as a XFCU and Cb subtype in the Tholen and SMASS taxonomy scheme, respectively. It orbits the Sun at a distance of 3.2–3.5 AU once every 6 years and 2 months (2,244 days). Its orbit shows an eccentricity of 0.06 and is notably tilted by 23 degrees to the plane of the ecliptic. It has a rather long rotation period of 10.6 hours,[7][8] with an alternative observation that gave 16 hours.[9] The body has a low geometric albedo around 0.04, according to the surveys carried out by IRAS, Akari, WISE and NEOWISE.[3][4][5][6]

    The minor planet was named after Riga, the capital of Latvia and site of the Astronomical Observatory of the University of Latvia. The name was proposed by Matiss A. Dirikis, who was a member of the observatory at the Latvian State University, and after whom the asteroid 1805 Dirikis is named.[2]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1796 Riga (1966 KB)" (2015-08-29 last obs.). Jet Propulsion Laboratory. Retrieved 20 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1796) Riga. Springer Berlin Heidelberg. p. 144. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 3 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 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 3 Alí-Lagoa, V.; de León, J.; Licandro, J.; Delbó, M.; Campins, H.; Pinilla-Alonso, N.; Kelley, M. S. (June 2013). "Physical properties of B-type asteroids from WISE data". Astronomy & Astrophysics 554: 16. arXiv:1303.5487. Bibcode:2013A&A...554A..71A. doi:10.1051/0004-6361/201220680. Retrieved November 2015.
    7. 1 2 Warner, Brian D. (April 2011). "Upon Further Review: VI. An Examination of Previous Lightcurve Analysis from the Palmer Divide Observatory". The Minor Planet Bulletin 38 (2): 96–101. Bibcode:2011MPBu...38...96W. ISSN 1052-8091. Retrieved November 2015.
    8. 1 2 Warner, Brian D. (March 2004). "Rotation rates for asteroids 875, 926, 1679, 1796, 3915, 4209, and 34817". The Minor Planet Bulletin 31 (1): 19–22. Bibcode:2004MPBu...31...19W. ISSN 1052-8091. Retrieved November 2015.
    9. 1 2 Chiorny, V. G.; Shevchenko, V. G.; Krugly, Yu. N.; Velichko, F. P.; Gaftonyuk, N. M. (May 2007). "Photometry of asteroids: Lightcurves of 24 asteroids obtained in 1993 2005". Planetary and Space Science 55 (7-8): 986–997. Bibcode:2007P&SS...55..986C. doi:10.1016/j.pss.2007.01.001. Retrieved November 2015.
    10. ↑ "LCDB Data for (1796) Riga". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    11. ↑ "1796 Riga (1966 KB)". Minor Planet Center. Retrieved November 2015.

    External links


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