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206 Hersilia (A879 TC)
Classification: Main-belt Asteroid          SPK-ID: 2000206
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 103 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03885714799267799 2.026e-08  
a 2.740353377980792 7.7613e-09 au
q 2.633871061220357 5.8466e-08 au
i 3.779644129455066 8.8194e-07 deg
node 145.0424089346972 8.2316e-06 deg
peri 302.8481221552153 2.3588e-05 deg
M 333.3947312123847 2.5499e-05 deg
tp 2459322.954128632149
(2021-Apr-18.45412863)
0.00011743 TDB
period 1656.945722273419
4.54
7.0393e-06
1.927e-08
d
yr
n .2172672255709502 9.2302e-10 deg/d
Q 2.846835694741227 8.0629e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3504  
   data-arc span      51641 days (141.39 yr)  
   first obs. used      1879-10-14  
   last obs. used      2021-03-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43738  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 10:47:11  

Additional Information
 Earth MOID = 1.65241 au 
 Jupiter MOID = 2.21963 au 
 T_jup = 3.346 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457219.5 (2015-Jul-16.0) TDB
Reference: JPL 103 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03761706595366502 2.0324e-08  
q 2.638248720126978 5.861e-08 au
tp 2457650.054470397658
(2016-Sep-18.55447040)
0.00011873 TDB
node 145.1695240493258 8.2403e-06 deg
peri 299.431440379025 2.4015e-05 deg
i 3.778646722837613 8.8255e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3504  
   data-arc span      51641 days (141.39 yr)  
   first obs. used      1879-10-14  
   last obs. used      2021-03-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43738  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 10:47:11  

Additional Information
 Jupiter MOID = 2.21963 au 
 T_jup = 3.346 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.130778273450942E-16 -1.1824808224646E-15 -8.263938918170386E-13 1.040275620415294E-14 -1.469286586652556E-13 1.036538227377731E-15
q -1.1824808224646E-15 3.435153662798544E-15 2.314837764311718E-12 -2.84234698911446E-14 4.052901706462056E-13 -2.786509001059959E-15
tp -8.263938918170386E-13 2.314837764311718E-12 1.40968146360885E-8 2.922183963469736E-10 2.699463728629051E-9 3.42383435636399E-11
node 1.040275620415294E-14 -2.84234698911446E-14 2.922183963469736E-10 6.790309968108764E-11 -2.454769207944344E-12 6.396330020379808E-12
peri -1.469286586652556E-13 4.052901706462056E-13 2.699463728629051E-9 -2.454769207944344E-12 5.76709813309566E-10 1.22110083364346E-12
i 1.036538227377731E-15 -2.786509001059959E-15 3.42383435636399E-11 6.396330020379808E-12 1.22110083364346E-12 7.788899065254575E-13

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 8.77   n/a E2021B10  
diameter diameter 113 km n/a J.G. Williams (E-mail September 1990) based on assumed albedo of 0.048 for C-type
rotation period rot_per 11.122 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Willis, S. (2004) Minor Planet Bull. 31, 82-83.]
[Behrend, R. (2008) 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]
[Pilcher, F. (2020) Minor Planet Bull. 47, 34-36.]
geometric albedo albedo 0.057   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.690   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=2.15, mean=5.88, max.=15.02) deg.
U-B UB 0.345   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=2.15, mean=5.88, max.=15.02) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B C   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)

206 Hersilia (A879 TC)          Discovered 1879-Oct-13 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A879 TC = 1961 WG = 1974 PM 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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