2207 Antenor

2207 Antenor
Discovery [1]
Discovered by N. Chernykh
Discovery site CrAO – Nauchnyj
Discovery date 19 August 1977
Designations
MPC designation 2207 Antenor
Named after
 Antenor
(Greek mythology)[2]
1977 QH1 · 1959 EM
1971 BE1 · 1978 UU
Jupiter trojan [3][4]
(Trojan camp)
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 57.00 yr (20,818 days)    
Aphelion 5.2252 AU
Perihelion 5.0519 AU
5.1386 AU
Eccentricity 0.0168
11.65 yr (4,255 days)
11.993°
0° 5m 4.56s / day
Inclination 6.8081°
159.13°
298.40°
Jupiter MOID 0.1855 AU
Jupiter Tisserand parameter 2.986
Physical characteristics
Dimensions 85.11±3.7 km (IRAS:9)[5]
91.32±2.22 km[6]
97.66±0.50 km[7]
7.965±0.002 h[8]
8.01 h[9]
7.906±0.009 h[lower-alpha 1]
7.9656±0.0103 h[10]
0.0678±0.006 (IRAS:9)[5]
0.059±0.003[6]
0.051±0.003[7]
B–V = 0.733[1]
U–B = 0.232[1]
Tholen = D [1] · D [3]
8.89[1][3][5][6][7]
9.16±0.19[11]
9.304±0.002[10]
8.863±0.002[10]

    2207 Antenor, provisional designation 1977 QH1, is a rare-type Jupiter trojan from the Trojan camp, approximately 85 kilometers in diameter. It was discovered on 19 August 1977, by Russian astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnyj on the Crimean peninsula.[4]

    The dark and reddish body is classified as a D-type asteroid in the Tholen taxonomic scheme. This spectral type is rather rare with only 46 bodies known as of 2016.[12] The Jupiter trojan is orbiting in the trailering Trojan camp, at Jupiter's L5 Lagrangian point, 60° behind its orbit (see Trojans in astronomy). It orbits the Sun at a distance of 5.1–5.2 AU once every 11 years and 8 months (4,255 days). Its orbit has a very low eccentricity of 0.02 and an inclination of 7° with respect to the ecliptic.[1]

    Photometric observations of this asteroid during 1996 were used to build a light-curve showing a rotation period of 7.965±0.002 hours with a brightness variation of 0.09±0.01 magnitude (U=2+). Several other observations rendered similar results with a period between 7.91 and 7.98 hours (U=2).[lower-alpha 1][10]

    According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 85.1 and 97.7 kilometers in diameter and has an albedo of 0.051–0.068.[5][6][7] The Collaborative Asteroid Lightcurve Link (CALL) adopts the results obtain by the 9 observations performed by IRAS, that is a diameter of 85.1 kilometer and an albedo of 0.068.[3]

    The minor planet is named after Antenor, one of the wisest of the elders and counselor of King Priam of Troy. Sympathetic to a negotiated peace with the Greeks, he advised his countrymen to return Helen of Troy to Menelaus during the Trojan War.[2] The minor planets 884 Priamus, 101 Helena and 1647 Menelaus are also named after these figures from Greek mythology. In later accounts Antenor was made an open traitor, who unsealed the gates of Troy to the Greek enemy.

    References

    1. 1 2 Stephens (2016) web: rotation period 7.906±0.009 hours with a brightness amplitude of 0.09 mag. No LCDB quality code has been assigned. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (2207) Antenor
    1. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 2207 Antenor (1977 QH1)" (2016-03-10 last obs.). Jet Propulsion Laboratory. Retrieved March 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2207) Antenor. Springer Berlin Heidelberg. p. 179. ISBN 978-3-540-00238-3. Retrieved March 2016.
    3. 1 2 3 4 "LCDB Data for (2207) Antenor". Asteroid Lightcurve Database (LCDB). Retrieved March 2016.
    4. 1 2 "2207 Antenor (1977 QH1)". Minor Planet Center. Retrieved March 2016.
    5. 1 2 3 4 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 March 2016.
    6. 1 2 3 4 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 March 2016.
    7. 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 March 2016.
    8. ↑ Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170. Retrieved March 2016.
    9. ↑ Gonano, M.; Mottola, S.; Neukum, G.; di Martino, M. (December 1990). "Physical study of outer belt asteroids". Space dust and debris; Proceedings of the Topical Meeting of the Interdisciplinary Scientific Commission B /Meetings B2: 197–200. Bibcode:1991AdSpR..11..197G. doi:10.1016/0273-1177(91)90563-Y. ISSN 0273-1177. Retrieved March 2016.
    10. 1 2 3 4 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved March 2016.
    11. ↑ 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 March 2016.
    12. ↑ "JPL Small-Body Database Search Engine: [ spec. type = D (Tholen) or spec. type = D (SMASSII) ]". JPL Solar System Dynamics. Retrieved March 2016.

    External links


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