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10021 Henja (1979 QC1)
Classification: Main-belt Asteroid          SPK-ID: 2010021
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1734904582051723 1.4409e-08  
a 2.346465460950905 7.7357e-09 au
q 1.939376092967922 3.367e-08 au
i 11.68549107102076 5.9917e-07 deg
node 326.1202917817964 3.07e-06 deg
peri 61.27576780320093 5.3316e-06 deg
M 187.0378591873282 4.7995e-06 deg
tp 2460027.265929487039
(2023-Mar-23.76592949)
1.9281e-05 TDB
period 1312.863806775325
3.59
6.4923e-06
1.777e-08
d
yr
n .2742097071624185 1.356e-09 deg/d
Q 2.753554828933888 9.0778e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1990  
   data-arc span      24374 days (66.73 yr)  
   first obs. used      1954-09-23  
   last obs. used      2021-06-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45308  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 02:11:04  

Additional Information
 Earth MOID = .970327 au 
 Jupiter MOID = 2.80823 au 
 T_jup = 3.513 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457327.5 (2015-Nov-01.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1734305701764674 1.4365e-08  
q 1.939898227464639 3.3524e-08 au
tp 2457398.893888447783
(2016-Jan-11.39388845)
1.5008e-05 TDB
node 326.2530631755068 3.0671e-06 deg
peri 60.70065132440034 5.3285e-06 deg
i 11.69334503066375 5.9916e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      1990  
   data-arc span      24374 days (66.73 yr)  
   first obs. used      1954-09-23  
   last obs. used      2021-06-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45308  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 02:11:04  

Additional Information
 Jupiter MOID = 2.80823 au 
 T_jup = 3.513 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.063464423192163E-16 -4.729427727312973E-16 1.574943776057178E-14 7.402281134636068E-16 1.940698765590567E-14 -2.175152599638213E-15
q -4.729427727312973E-16 1.123857872935835E-15 -4.188243134866422E-14 -1.629405034300404E-15 -4.792080187114876E-14 5.080904498014892E-15
tp 1.574943776057178E-14 -4.188243134866422E-14 2.252315209287558E-10 1.240329005070375E-11 6.514927122039269E-11 9.030000608419404E-13
node 7.402281134636068E-16 -1.629405034300404E-15 1.240329005070375E-11 9.407336596642395E-12 -4.688704658131858E-12 -1.335212990772476E-13
peri 1.940698765590567E-14 -4.792080187114876E-14 6.514927122039269E-11 -4.688704658131858E-12 2.839290734397361E-11 3.470016305946712E-13
i -2.175152599638213E-15 5.080904498014892E-15 9.030000608419404E-13 -1.335212990772476E-13 3.470016305946712E-13 3.58996678654336E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.07   n/a MPO614063  
diameter diameter 7.176 km 0.206 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.060   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

10021 Henja           Discovered 1979 Aug. 22 by C.-I. Lagerkvist at the European Southern Observatory.
Karin Henja is a prolific constructor of the Swedish form of crossword puzzles.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20031110/MPCPages.arcLast Updated: 2003-11-12

Alternate Designations
 1979 QC1 = 1954 SH 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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