2449 Kenos

2449 Kenos, provisional designation 1978 GC, is a bright Hungaria asteroid and medium-sized Mars-crosser from the inner regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered by American astronomer William Liller at Cerro Tololo Inter-American Observatory in Chile, on 8 April 1978, and named after Kenos from Selknam mythology.[2][3] A minor-planet moon was discovered around the asteroid on 27 February 2015.[10]

2449 Kenos
Discovery [1]
Discovered byW. Liller
Discovery siteCerro Tololo
Discovery date8 April 1978
Designations
(2449) Kenos
Named after
Kenos (Selknam mythology)[2]
1978 GC
Mars-crosser [1] · Hungaria [3] · binary
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc38.93 yr (14,220 days)
Aphelion2.2303 AU
Perihelion1.5872 AU
1.9088 AU
Eccentricity0.1685
2.64 yr (963 days)
258.57°
0° 22m 25.32s / day
Inclination24.986°
179.86°
102.25°
Physical characteristics
Dimensions2.95 km (calculated)[4]
3.846±0.001 h[5]
3.8481±0.0003 h[6]
3.8492±0.0008 h[7]
4.188±0.007 h[8]
0.4 (assumed)[4]
Tholen = E [1] · CX [9] · E [4]
B–V = 0.684[1]
U–B = 0.356[1]
14.07±0.09[8] · 14.26[1][4] · 14.46±0.48[9]

    Orbit and classification

    Kenos is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. IT orbits the Sun in the inner main-belt at a distance of 1.6–2.2 AU once every 2 years and 8 months (963 days). Its orbit has an eccentricity of 0.17 and an inclination of 25° with respect to the ecliptic.[1] Based on assumption made by the Collaborative Asteroid Lightcurve Link, the body has a high albedo of 0.4, which is typical for E-type asteroids with a magnesium silicate surface (also see Enstatite chondrite).

    Physical characteristics

    In the Tholen taxonomy, Kenos is an E-type asteroid.[1] PanSTARRS has characterized it as a CX-type, which transitions between the C-type and X-type asteroids.[9]

    Observations performed at the Palmer Divide Observatory (716) in Colorado Springs, Colorado, during 2007 produced a lightcurve with a period of 3.8492 hours and a brightness range of 0.20 in magnitude.[7] Two more recent observations confirmed the 3.85-hour period.[5][6]

    Naming

    This minor planet was named after Kenos, the first man in the Selknam mythology of the Native Americans of Tierra del Fuego, sent by the Supreme Being to bring order into the world. He created the human race by using peat to make male and female organs, taught them language and instructed them in rules to fashion a harmonious society.[2] The official naming citation was published by the Minor Planet Center on 6 February 1993 (M.P.C. 21606).[11]

    References
    1. "JPL Small-Body Database Browser: 2449 Kenos (1978 GC)" (2017-03-14 last obs.). Jet Propulsion Laboratory. Retrieved 13 June 2017.
    2. Schmadel, Lutz D. (2007). "(2449) Kenos". Dictionary of Minor Planet Names – (2449) Kenos. Springer Berlin Heidelberg. pp. 199–200. doi:10.1007/978-3-540-29925-7_2450. ISBN 978-3-540-00238-3.
    3. "2449 Kenos (1978 GC)". Minor Planet Center. Retrieved 6 December 2016.
    4. "LCDB Data for (2449) Kenos". Asteroid Lightcurve Database (LCDB). Retrieved 6 December 2016.
    5. Warner, Brian D. (October 2010). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2010 March - June". The Minor Planet Bulletin. 37 (4): 161–165. Bibcode:2010MPBu...37..161W. ISSN 1052-8091. Retrieved 6 December 2016.
    6. Warner, Brian D. (July 2015). "Three Unusual Hungaria Asteroids". The Minor Planet Bulletin. 42 (3): 183–186. Bibcode:2015MPBu...42..183W. ISSN 1052-8091. Retrieved 6 December 2016.
    7. Warner, Brian D. (September 2007). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory - December 2006 - March 2007". The Minor Planet Bulletin. 34 (3): 72–77. Bibcode:2007MPBu...34...72W. ISSN 1052-8091. Retrieved 6 December 2016.
    8. Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference. 26: 1511. Bibcode:1995LPI....26.1511W. Retrieved 6 December 2016.
    9. 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 6 December 2016.
    10. Johnston, W. R. (29 May 2019). "(2449) Kenos". Asteroids with Satellites Database. Johnston's Archive. Retrieved 23 November 2019.
    11. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 6 December 2016.

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