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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 102 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03885714447738538 3.4979e-08  
a 2.74035337702403 7.9645e-09 au
q 2.633871069933916 9.712e-08 au
i 3.779640787987312 3.8858e-06 deg
node 145.0424936783031 5.6203e-05 deg
peri 302.8480419122242 7.4758e-05 deg
M 333.3947283609739 4.9121e-05 deg
tp 2459322.954141691999
(2021-Apr-18.45414169)
0.00022613 TDB
period 1656.945721405664
4.54
7.2236e-06
1.978e-08
d
yr
n .2172672256847347 9.4719e-10 deg/d
Q 2.846835684114144 8.274e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3421  
   data-arc span      51596 days (141.26 yr)  
   first obs. used      1879-10-14  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44158  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:44:27  

Additional Information
 Earth MOID = 1.65241 au 
 Jupiter MOID = 2.21963 au 
 T_jup = 3.346 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456192.5 (2012-Sep-22.0) TDB
Reference: JPL 102 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03817097492906414 3.4522e-08  
q 2.635343319936903 9.5714e-08 au
tp 2455988.783133515974
(2012-Mar-02.28313352)
0.00023202 TDB
node 145.1830369317397 5.6228e-05 deg
peri 298.5883480411847 7.5796e-05 deg
i 3.778552348896513 3.885e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3421  
   data-arc span      51596 days (141.26 yr)  
   first obs. used      1879-10-14  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44158  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:44:27  

Additional Information
 Jupiter MOID = 2.21963 au 
 T_jup = 3.346 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.191761456256639E-15 -3.293596075783906E-15 5.301303223917142E-13 -3.589028170500901E-16 1.255385338821019E-13 -1.877082622709764E-16
q -3.293596075783906E-15 9.161234432773653E-15 -1.360808574407091E-12 6.990529587709759E-16 -3.230999232546783E-13 6.57956763803317E-16
tp 5.301303223917142E-13 -1.360808574407091E-12 5.383340430588005E-8 -4.131419469971969E-12 1.180880240017468E-8 9.465714848158079E-13
node -3.589028170500901E-16 6.990529587709759E-16 -4.131419469971969E-12 3.161575584345612E-9 -3.155151794213038E-9 -9.214246432397838E-12
peri 1.255385338821019E-13 -3.230999232546783E-13 1.180880240017468E-8 -3.155151794213038E-9 5.745025461572269E-9 9.413270822024778E-12
i -1.877082622709764E-16 6.57956763803317E-16 9.465714848158079E-13 -9.214246432397838E-12 9.413270822024778E-12 1.50933134812562E-11

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

[ show close-approach data ]
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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