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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 104 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0388571475449245 2.0248e-08  
a 2.740353377654604 7.7564e-09 au
q 2.633871062133847 5.8424e-08 au
i 3.779644121311927 8.8182e-07 deg
node 145.0424086493307 8.2307e-06 deg
peri 302.8481216982122 2.3576e-05 deg
M 333.3947318665029 2.5482e-05 deg
tp 2459322.954125599623
(2021-Apr-18.45412560)
0.00011735 TDB
period 1656.945721977576
4.54
7.0348e-06
1.926e-08
d
yr
n .2172672256097427 9.2244e-10 deg/d
Q 2.846835693175361 8.0578e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3518  
   data-arc span      51650 days (141.41 yr)  
   first obs. used      1879-10-14  
   last obs. used      2021-03-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4366  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:28:57  

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 104 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03761706566050615 2.0311e-08  
q 2.638248721769051 5.8566e-08 au
tp 2457650.054468428034
(2016-Sep-18.55446843)
0.00011866 TDB
node 145.1695238683037 8.2394e-06 deg
peri 299.4314400562653 2.4004e-05 deg
i 3.778646713231872 8.8243e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3518  
   data-arc span      51650 days (141.41 yr)  
   first obs. used      1879-10-14  
   last obs. used      2021-03-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4366  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:28:57  

Additional Information
 Jupiter MOID = 2.21963 au 
 T_jup = 3.346 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.125467018599812E-16 -1.180831138012012E-15 -8.235512594677885E-13 1.043483901320444E-14 -1.464091001578093E-13 1.040809657324114E-15
q -1.180831138012012E-15 3.430027988424667E-15 2.306010384202661E-12 -2.852382223628153E-14 4.036775976963587E-13 -2.799856774688196E-15
tp -8.235512594677885E-13 2.306010384202661E-12 1.408112835221347E-8 2.919704894781365E-10 2.696655624489456E-9 3.420668166461998E-11
node 1.043483901320444E-14 -2.852382223628153E-14 2.919704894781365E-10 6.788811825809323E-11 -2.489782742043749E-12 6.394565812382133E-12
peri -1.464091001578093E-13 4.036775976963587E-13 2.696655624489456E-9 -2.489782742043749E-12 5.761991528605319E-10 1.216502861610656E-12
i 1.040809657324114E-15 -2.799856774688196E-15 3.420668166461998E-11 6.394565812382133E-12 1.216502861610656E-12 7.786816282861159E-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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2069-May-04 15:09 00:02 Psych 0.0495243995980361 0.0495201761240611 0.0495286230800255 1.86674773410056 1.86674760322808 2476871.131108938 2.21873568248848 211.513838084157 44.6250577930056 8.16076346776982 41750.9923879188 T 104 CATAB v2.0f-lin.ifort 2021-Apr-12 10:30:30 2021-Apr-12 10:30
2185-Sep-01 19:10 00:02 Juno 0.0462047761292593 0.0462035262488963 0.0462060280958346 4.89217939026891 4.8921793364473 2519359.298799152 1.65190616761948 596.168891076892 35.2116709006524 85.045156521523 195441.106052662 T 104 CATAB v2.0f-lin.ifort 2021-Apr-12 10:30:30 2021-Apr-12 10:30

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 2021-Apr-15 00:44 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin