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91103 (1998 HG21)
Classification: Main-belt Asteroid          SPK-ID: 2091103
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1460319228134159 4.3338e-08  
a 2.598334189848636 1.2756e-08 au
q 2.2188944519932 1.1104e-07 au
i 3.214905705170313 5.1082e-06 deg
node 35.73621520811412 7.4278e-05 deg
peri 16.21165985673881 7.6012e-05 deg
M 234.9371865105651 1.9159e-05 deg
tp 2459531.955165632270
(2021-Nov-13.45516563)
8.37e-05 TDB
period 1529.822129291693
4.19
1.1266e-05
3.084e-08
d
yr
n .2353214750310088 1.7329e-09 deg/d
Q 2.977773927704071 1.4619e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1070  
   data-arc span      7722 days (21.14 yr)  
   first obs. used      1998-03-20  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53906  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 06:03:22  

Additional Information
 Earth MOID = 1.22991 au 
 Jupiter MOID = 2.37988 au 
 T_jup = 3.399 
[ 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 14.7   n/a MPO291049  
diameter diameter 4.358 km 0.712 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.112   0.050 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91103 (1998 HG21)          Discovered 1998-Apr-20 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

Alternate Designations
 1998 HG21 = 2000 RC7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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