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21058 (1991 GF9)
Classification: Main-belt Asteroid          SPK-ID: 2021058
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1224410531954457 3.3757e-08  
a 2.292104223089184 7.3719e-09 au
q 2.011456567980416 7.8811e-08 au
i 4.441149704443167 3.7625e-06 deg
node 172.3074165763681 4.6273e-05 deg
peri 89.16599391920792 4.9738e-05 deg
M 89.55592341405172 1.6164e-05 deg
tp 2458685.187066961635
(2019-Jul-20.68706696)
5.7295e-05 TDB
period 1267.505839552325
3.47
6.1149e-06
1.674e-08
d
yr
n .284022360107745 1.3702e-09 deg/d
Q 2.572751878197952 8.2745e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1399  
   data-arc span      15505 days (42.45 yr)  
   first obs. used      1977-03-12  
   last obs. used      2019-08-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4978  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 23:17:59  

Additional Information
 Earth MOID = 1.00207 au 
 Jupiter MOID = 2.48377 au 
 T_jup = 3.584 
[ 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 15.2   n/a MPO431743  

21058 (1991 GF9)          Discovered 1991-Apr-10 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 GF9 = 1977 EF8 = 1998 HD6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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