Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 96 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0386883539020707 3.6847e-08  
a 2.739824262191127 8.7455e-09 au
q 2.633824971505997 1.0114e-07 au
i 3.779710872527625 4.3807e-06 deg
node 145.0447151331328 5.6626e-05 deg
peri 302.9950139321902 7.837e-05 deg
M 289.7780991148702 5.4907e-05 deg
tp 2459323.611613793378
(2021-Apr-19.11161379)
0.00025302 TDB
period 1656.465853237076
4.54
7.9311e-06
2.171e-08
d
yr
n .2173301666898148 1.0406e-09 deg/d
Q 2.845823552876257 9.0838e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3019  
   data-arc span      51218 days (140.23 yr)  
   first obs. used      1879-10-14  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45939  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:20:41  

Additional Information
 Earth MOID = 1.65266 au 
 Jupiter MOID = 2.2208 au 
 T_jup = 3.346 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455863.5 (2011-Oct-29.0) TDB
Reference: JPL 96 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0390717365941936 3.6006e-08  
q 2.635274336367343 9.8893e-08 au
tp 2455988.882018911610
(2012-Mar-02.38201891)
0.00025227 TDB
node 145.2097166343357 5.6647e-05 deg
peri 298.5852702837204 7.8808e-05 deg
i 3.777789700858009 4.3783e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3019  
   data-arc span      51218 days (140.23 yr)  
   first obs. used      1879-10-14  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45939  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:20:41  

Additional Information
 Jupiter MOID = 2.2208 au 
 T_jup = 3.346 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.296458050736974E-15 -3.54713844106337E-15 1.671704806616191E-12 -1.971736729385431E-15 3.659903602758074E-13 1.207609560683116E-16
q -3.54713844106337E-15 9.779863037719244E-15 -4.01846583187427E-12 4.583378984986984E-15 -8.829855238576967E-13 -3.677751170210456E-16
tp 1.671704806616191E-12 -4.01846583187427E-12 6.364097225237312E-8 -1.162864270567273E-11 1.383629614641769E-8 -4.631871343944717E-13
node -1.971736729385431E-15 4.583378984986984E-15 -1.162864270567273E-11 3.208900056147124E-9 -3.203956850008998E-9 -1.912551200228952E-11
peri 3.659903602758074E-13 -8.829855238576967E-13 1.383629614641769E-8 -3.203956850008998E-9 6.210745252735404E-9 1.899722454837286E-11
i 1.207609560683116E-16 -3.677751170210456E-16 -4.631871343944717E-13 -1.912551200228952E-11 1.899722454837286E-11 1.916910554239107E-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 8.7   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-August); 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 (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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jul-05 23:57 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin