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JPL Small-Body Database Browser
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206 Hersilia
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 94 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03819099836115646 3.6902e-08  
a 2.741163844766901 9.0144e-09 au
q 2.636476060863747 1.0113e-07 au
i 3.778693001194102 4.3911e-06 deg
node 145.0497135242675 5.7017e-05 deg
peri 302.5465394671002 7.9311e-05 deg
M 203.288223882866 5.5728e-05 deg
tp 2459322.105859930752
(2021-Apr-17.60585993)
0.00025738 TDB
period 1657.680845764265
4.54
8.177e-06
2.239e-08
d
yr
n .2171708751536089 1.0713e-09 deg/d
Q 2.845851628670054 9.3586e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2951  
   data-arc span      51187 days (140.14 yr)  
   first obs. used      1879-10-14  
   last obs. used      2019-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46425  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:39:17  

Additional Information
 Earth MOID = 1.65529 au 
 Jupiter MOID = 2.222 au 
 T_jup = 3.346 
[ 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 8.7   n/a MPO502154  
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. 2019-January); 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]
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          Discovered 1879-Oct-13 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1961 WG = 1974 PM 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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