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121 Hermione (A872 JA)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000121
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 106 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1298387004537455 2.904e-08  
a 3.461567484505669 1.0778e-08 au
q 3.012122060784511 1.0231e-07 au
i 7.584410222873001 3.1546e-06 deg
node 73.1127305802311 2.2446e-05 deg
peri 296.8740200938363 2.5668e-05 deg
M 281.2343016438339 1.3762e-05 deg
tp 2459515.185885063806
(2021-Oct-27.68588506)		 9.1337e-05 TDB
period 2352.380826805238
6.44		 1.0987e-05
3.008e-08		 d
yr
n .1530364454164145 7.1475e-10 deg/d
Q 3.911012908226826 1.2178e-08 au
   Orbit Determination Parameters
   # obs. used (total)      3791  
   data-arc span      54108 days (148.14 yr)  
   first obs. used      1872-06-07  
   last obs. used      2020-07-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41082  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:09:52  

Additional Information
 Earth MOID = 2.02248 au 
 Jupiter MOID = 1.60425 au 
 T_jup = 3.106 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.3   n/a MPO473762 IRAS observations used: 16
diameter diameter 209.00 km 4.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 16
rotation period rot_per 5.55128 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Piironen, J.; Bowell, E.; Erikson, A.; Magnusson, P. (1994) Astron. Astrophys. Suppl. Ser. 106, 587-595.]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Marchis, F.; Hestroffer, D.; Descamps, P.; Berthier, J.; et al. (2005) Icarus 178, 450-464.]
[Descampes, P.; Marchis, F.; Durech, J.; Emery, J.; et al. (2009) Icarus 203, 88-101.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Bin, L.; Haibin, Z.; Jingshen, Y. (2011) Minor Planet Bull. 38, 179-180.]
[Sergison, D. (2011) www.gothersobservatory.org.uk/lightcurves.htm]
[Kaasalainen, M.; Viikinkoski, M. (2012) Astron. Astrophys. 543, A97.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.]
geometric albedo albedo 0.0482   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 16
B-V BV 0.739   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=4.77, mean=13.89, max.=18.88) deg.
U-B UB 0.425   0.087 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=4.77, mean=13.89, max.=18.88) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

121 Hermione (A872 JA)          Discovered 1872-May-12 by Watson, J. C. at Ann Arbor
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A872 JA = 1970 VE 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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