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685 Hermia (A909 PC)
Classification: Main-belt Asteroid          SPK-ID: 2000685
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1962688763527819 2.9361e-08  
a 2.236222156595578 4.9073e-09 au
q 1.797321346645369 6.6078e-08 au
i 3.646335369975023 3.2968e-06 deg
node 235.202223557375 5.2274e-05 deg
peri 80.72859293698907 5.2925e-05 deg
M 115.9346611792864 8.8387e-06 deg
tp 2458807.147746580375
(2019-Nov-19.64774658)
2.9616e-05 TDB
period 1221.436365886108
3.34
4.0206e-06
1.101e-08
d
yr
n .2947349612755577 9.7017e-10 deg/d
Q 2.675122966545786 5.8704e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3390  
   data-arc span      35469 days (97.11 yr)  
   first obs. used      1923-12-14  
   last obs. used      2021-01-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43028  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:48:50  

Additional Information
 Earth MOID = .786245 au 
 Jupiter MOID = 2.61844 au 
 T_jup = 3.610 
[ 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 12.04   n/a E2021B10  
diameter diameter 10.95 km 0.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
rotation period rot_per 50.40 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Stephens, R.D. (2007) Minor Planet Bull. 34, 14-15.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; et al. (2012) Astron. Astrophys. 546, A72.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.2807   0.050 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2

685 Hermia (A909 PC)          Discovered 1909-Aug-12 by Lorenz, W. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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