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JPL Small-Body Database Browser
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624 Hektor (A907 CF)
Classification: Jupiter Trojan          SPK-ID: 2000624
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 95 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02279654739593592 5.3565e-08  
a 5.262259750651684 6.2175e-08 au
q 5.142298396836227 2.7614e-07 au
i 18.15769721789642 6.1123e-06 deg
node 342.7910348097215 1.4258e-05 deg
peri 184.2438818326409 0.0001079 deg
M 202.5084925851307 0.00010915 deg
tp 2460929.407884051631
(2025-Sep-10.90788405)
0.0013516 TDB
period 4409.170054035726
12.07
7.8144e-05
2.139e-07
d
yr
n .08164801892149544 1.447e-09 deg/d
Q 5.382221104467141 6.3593e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3198  
   data-arc span      41239 days (112.91 yr)  
   first obs. used      1907-02-11  
   last obs. used      2020-01-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36273  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:35:04  

Additional Information
 Earth MOID = 4.14985 au 
 Jupiter MOID = .272419 au 
 T_jup = 2.899 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455612.5 (2011-Feb-20.0) TDB
Reference: JPL 95 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0226751463647914 5.3601e-08  
q 5.121264676075021 2.7675e-07 au
tp 2456483.483229666473
(2013-Jul-09.98322967)
0.0013213 TDB
node 342.7986399493192 1.4252e-05 deg
peri 180.5319193184341 0.00010876 deg
i 18.18152001106635 6.1199e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3198  
   data-arc span      41239 days (112.91 yr)  
   first obs. used      1907-02-11  
   last obs. used      2020-01-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36273  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:35:04  

Additional Information
 Jupiter MOID = .272419 au 
 T_jup = 2.899 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.873102246189919E-15 -1.446751993404742E-14 3.63672944680583E-12 2.977696577338716E-15 2.922398089097655E-13 -5.672308925436413E-16
q -1.446751993404742E-14 7.658822562386011E-14 1.542921133786925E-11 -1.307209582573455E-14 1.213898711727464E-12 3.055260291553717E-15
tp 3.63672944680583E-12 1.542921133786925E-11 1.745882300549482E-6 8.938331167555614E-11 1.424954258866133E-7 7.168153662307221E-12
node 2.977696577338716E-15 -1.307209582573455E-14 8.938331167555614E-11 2.031223124171204E-10 -1.853491090515051E-10 -1.359209743386865E-12
peri 2.922398089097655E-13 1.213898711727464E-12 1.424954258866133E-7 -1.853491090515051E-10 1.182794084062059E-8 1.844114274760633E-12
i -5.672308925436413E-16 3.055260291553717E-15 7.168153662307221E-12 -1.359209743386865E-12 1.844114274760633E-12 3.74535999924342E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.3   n/a MPO452166  
diameter diameter 225 km n/a J.G. Williams 9-90  
rotation period rot_per 6.924 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Dunlap, J.L.; Gehrels, T. (1969) Astron. J. 74, 796-803.]
[Magnusson, P. (1983) in Asteroids, Comets, Meteors. C.-I. Lagerkvist, H. Rickman, eds. Uppsala, pp. 77-85.]
[Magnusson, P. (1986) Icarus 68, 1-39.]
[Uchida, K.; Goguen, J.D. (1987) Bull. Amer. Astron. Soc. 19, 842.]
[Michalowski, T. (1988) Acta Astronomica 38, 455-468.]
[De Angelis, G. (1992) in Physical properties of small solar system bodies. A. Brahic, J.-C. Gerard, J. Surdej, eds. Universite de Liege, Institut d'Astrophysique, Liege, pp. 195-201.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Szabo, Gy.; Sarneczky, K.; Kiss, L.L. (1999) in Proc. IAU Coll. 173, Evolution and Source Regions of Asteroids and Comets, 185-188.]
[Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Astron. Astrophys. 383, L19-L22.]
[Lacerda, P.; Jewitt, D.C. (2007) Astron. J. 133, 1393-1408.]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hamanowa, H.; Hamanowa, H. (2009) Minor Planet Bull. 36, 87-88.]
[Stephens, R.D. (2009) Minor Planet Bull. 36, 59-62.]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2013) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Gorshanov, D.L.; Arkharov, A.A.; Larionov, V.M. (2014) Solar System Research 48, 202-211.]
[Marchis, F.; Durech, J.; Castillo-Rogez, J.; Vachier, F.; et al. (2014). Astrophys. J. Let. 783, L37.]
[Stephens, R.D.; Coley, D.R.; French, L.M. (2014) Minor Planet Bull. 41, 210-212.]
[Hanus, J.; Delbo, M.; Durech, J.; Ali-Lagoa, V. (2015) Icarus 256, 101-116.]
geometric albedo albedo 0.025   n/a EAR-A-5-DDR-ALBEDOS-V1.0:TRIAD TRIAD quality code 3
B-V BV 0.776   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=9; phase (min.=3.84, mean=5.77, max.=7.78) deg.
U-B UB 0.249   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=3.84, mean=6.11, max.=7.78) deg.
Tholen spectral type spec_T D   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

624 Hektor (A907 CF)          Discovered 1907-Feb-10 by Kopff, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A907 CF = 1948 VD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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