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6686 Hernius (1979 QC2)
Classification: Main-belt Asteroid          SPK-ID: 2006686
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09863982351269444 1.8628e-08  
a 2.94801468577744 1.1223e-08 au
q 2.657223037459522 5.8403e-08 au
i 2.383412165315889 9.1582e-07 deg
node 160.7804728521374 1.2006e-05 deg
peri 256.0253053928308 1.3624e-05 deg
M 340.1240899074633 6.0203e-06 deg
tp 2459302.574535823041
(2021-Mar-29.07453582)
3.0889e-05 TDB
period 1848.812594000054
5.06
1.0557e-05
2.89e-08
d
yr
n .1947195736162264 1.1119e-09 deg/d
Q 3.238806334095358 1.233e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2869  
   data-arc span      23839 days (65.27 yr)  
   first obs. used      1955-12-12  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4461  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 23:00:56  

Additional Information
 Earth MOID = 1.66958 au 
 Jupiter MOID = 2.0632 au 
 T_jup = 3.262 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.72   n/a E2021B10  
diameter diameter 8.571 km 0.153 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.707 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.200   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6686 Hernius (1979 QC2)          Discovered 1979-Aug-22 by Lagerkvist, C.-I. at La Silla
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1979 QC2 = 1977 EC9 = 1980 WS2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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