2207 Antenor

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2207 Antenor
Discovery [1]
Discovered by N. Chernykh
Discovery site Crimean Astrophysical Obs.
Discovery date 19 August 1977
MPC designation (2207) Antenor
Pronunciation /ænˈtnɔːr/ an-TEE-nor
Named after
Antenor (Greek mythology)[2]
1977 QH1 · 1959 EM
1971 BE1 · 1978 UU
Jupiter trojan[3][4]
(Trojan camp)[5]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 58.15 yr (21,240 days)
Aphelion 5.2300 AU
Perihelion 5.0555 AU
5.1428 AU
Eccentricity 0.0170
11.66 yr (4,260 days)
0° 5m 4.2s / day
Inclination 6.8072°
Jupiter MOID 0.1969 AU
Jupiter Tisserand parameter 2.9860
Physical characteristics
Dimensions 85.11±3.7 km (IRAS:9)[6]
91.32±2.22 km[7]
97.66±0.50 km[9]
7.906±0.009 h[a]
7.9604±0.0103 h[10]
7.965±0.002 h[11]
7.9656±0.0103 h[10]
8.01 h[12]
0.0678±0.006 (IRAS:9)[6]
Tholen = D[1] · D[3]
B–V = 0.733[1]
U–B = 0.232[1]
8.863±0.002 (S)[10] · 8.89[1][3][6][7][9] · 9.16±0.19[13] · 9.2[11] · 9.304±0.002 (R)[10]

2207 Antenor (/ænˈtnɔːr/ an-TEE-nor), 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 asteroid was named for Antenor from Greek mythology.[2]

Orbit and classification[edit]

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 beyond the outer main-belt at a distance of 5.1–5.2 AU once every 11 years and 8 months (4,260 days). Its orbit has an eccentricity of 0.02 and an inclination of 7° with respect to the ecliptic.[1]

The asteroid's observation arc begins with its discovery in 1977. The first unused precoveries were taken at Lowell Observatory and the discovering observatory in 1959 and 1971, respectively.[4]

Physical characteristics[edit]

The dark and reddish body is classified as a D-type asteroid asteroid in the Tholen taxonomy. This spectral type is rather rare with only 46 bodies known as of 2016.[14]


Photometric observations of this asteroid were taken in October 1989, by astronomers Mario Di Martino and Maria Gonano–Beurer with the now decommissioned ESO 1-metre telescope at La Silla, Chile. The lightcurve built from these observations showed a rotation period of 7.965 hours with a brightness variation of 0.09 magnitude (U=2+).[11]

Two rotational lightcurves in the R and S-band were obtained at the Palomar Transient Factory in September 2012, which rendered a period of 7.9656 and 7.9604 hours with and amplitude of 0.12 and 0.15, respectively (U=2/2).[10] The most recent observation by Robert Stephens at CS3 in February 2016, gave a period of 7.906 hours with an amplitude of 0.09 (U=n.a.).[a]

Diameter and albedo[edit]

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.[6][7][9] The Collaborative Asteroid Lightcurve Link adopts the results obtain by the 9 observations made 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]

In later accounts Antenor was made an open traitor, who unsealed the gates of Troy to the Greek enemy. The official naming citation was published by the Minor Planet Center on 1 March 1981 (M.P.C. 5849).[15] The minor planets 884 Priamus, 101 Helena and 1647 Menelaus are also named after these figures from Greek mythology.


  1. ^ a b 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 for (2207) Antenor at Collaborative Asteroid Lightcurve Link (CALL)


  1. ^ a b c d e f g "JPL Small-Body Database Browser: 2207 Antenor (1977 QH1)" (2017-05-05 last obs.). Jet Propulsion Laboratory. Retrieved 12 June 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2207) Antenor. Springer Berlin Heidelberg. p. 179. ISBN 978-3-540-00238-3. Retrieved 1 March 2016. 
  3. ^ a b c d "LCDB Data for (2207) Antenor". Asteroid Lightcurve Database (LCDB). Retrieved 1 March 2016. 
  4. ^ a b c "2207 Antenor (1977 QH1)". Minor Planet Center. Retrieved 1 March 2016. 
  5. ^ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 5 December 2016. 
  6. ^ a b c d 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 1 March 2016. 
  7. ^ a b c d 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 1 March 2016. 
  8. ^ a b Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549Freely accessible. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 7 December 2016. 
  9. ^ a b c d 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 22 May 2016. 
  10. ^ a b c d e 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:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 22 May 2016. 
  11. ^ a b c 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 1 March 2016. 
  12. ^ 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 1 March 2016. 
  13. ^ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 22 May 2016. 
  14. ^ "JPL Small-Body Database Search Engine: [ spec. type = D (Tholen) or spec. type = D (SMASSII) ]". JPL Solar System Dynamics. Retrieved 1 March 2016. 
  15. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 22 May 2016. 

External links[edit]