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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1733007605365286 1.4735e-08  
a 2.346859143734288 8.1653e-09 au
q 1.94014666925303 3.4958e-08 au
i 11.68528546592226 6.0087e-07 deg
node 326.1194587997292 3.0937e-06 deg
peri 61.29282597359969 5.6945e-06 deg
M 133.2841702460217 4.7352e-06 deg
tp 2458714.311104475866
(2019-Aug-18.81110448)
1.6461e-05 TDB
period 1313.194223031993
3.60
6.8534e-06
1.876e-08
d
yr
n .2741407125358862 1.4307e-09 deg/d
Q 2.753571618215547 9.5803e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1817  
   data-arc span      24288 days (66.50 yr)  
   first obs. used      1954-09-23  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45672  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 00:29:00  

Additional Information
 Earth MOID = .970532 au 
 Jupiter MOID = 2.80741 au 
 T_jup = 3.513 
[ 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 14.06   n/a E2021B10  
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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