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458 Hercynia (A900 SD)
Classification: Main-belt Asteroid          SPK-ID: 2000458
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 84 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2419427100779074 3.2306e-08  
a 2.993537308271893 8.8333e-09 au
q 2.269272779189267 9.8603e-08 au
i 12.65409830385469 3.556e-06 deg
node 134.1375625866835 1.733e-05 deg
peri 277.1766632290198 1.8884e-05 deg
M 8.388085273231557 8.3421e-06 deg
tp 2458956.420589723359
4.3736e-05 TDB
period 1891.800951312618
n .1902948614917524 8.4228e-10 deg/d
Q 3.717801837354519 1.097e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2760  
   data-arc span      43870 days (120.11 yr)  
   first obs. used      1900-09-21  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41921  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:29:23  

Additional Information
 Earth MOID = 1.32155 au 
 Jupiter MOID = 1.86647 au 
 T_jup = 3.174 
[ 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 9.6   n/a MPO502157 IRAS observations used: 8
diameter diameter 36.698 km 0.408 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 21.806 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Binzel, R.P. (1987) Icarus 72, 135-208.]
[Behrend, R. (2004) Observatoire de Geneve web site,]
[Aznar Macias, A.; Carreno Garcerain, A.; Arce Masego, E.; Brines Rodriques, P.; et al. (2016) Minor Planet Bull. 43, 257-263.]
[Devogele, M.; Tanga, P.; Bendjoya, P.; Rivet, J.P.; et al. (2017) ArXiv:1707.07503.]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.191   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.885   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=19.21 deg.
U-B UB 0.471   0.051 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=19.21 deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B L   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)

458 Hercynia (A900 SD)          Discovered 1900-Sep-21 by Wolf, M. and Schwassmann, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A900 SD = 1947 XB = 2016 FW5 = A902 CA = A915 PD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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