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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 115 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1272118797816282 2.8679e-08  
a 3.457681728532036 1.2214e-08 au
q 3.017823536158886 9.9689e-08 au
i 7.565017782503755 3.1065e-06 deg
node 72.91744939145963 2.2331e-05 deg
peri 296.7410660362191 2.555e-05 deg
M 341.9355806113214 1.3535e-05 deg
tp 2459514.341281301463
(2021-Oct-26.84128130)
8.8642e-05 TDB
period 2348.420968077952
6.43
1.2443e-05
3.407e-08
d
yr
n .153294492296515 8.1225e-10 deg/d
Q 3.897539920905185 1.3768e-08 au
  Orbit Determination Parameters
   # obs. used (total)      4055  
   data-arc span      54440 days (149.05 yr)  
   first obs. used      1872-06-07  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4068  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:33:51  

Additional Information
 Earth MOID = 2.02725 au 
 Jupiter MOID = 1.61911 au 
 T_jup = 3.108 
[ 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 7.36   n/a MPCxxxxx 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. 2020-October); 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]
[Li, B.; Zhao, H.; Yao, J. (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

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