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JPL Small-Body Database Browser
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39957 (1998 FG121)
Classification: Main-belt Asteroid          SPK-ID: 2039957
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2079552615137408 3.4065e-08  
a 2.426641487804739 1.2101e-08 au
q 1.922008622608212 8.293e-08 au
i 3.79016733403104 5.4748e-06 deg
node 340.2516508304535 6.3295e-05 deg
peri 288.6044292137047 6.5197e-05 deg
M 250.50219943155 1.787e-05 deg
tp 2459420.461762256103
(2021-Jul-24.96176226)
7.004e-05 TDB
period 1380.723938082084
3.78
1.0328e-05
2.828e-08
d
yr
n .2607327866713627 1.9503e-09 deg/d
Q 2.931274353001267 1.4618e-08 au
  Orbit Determination Parameters
   # obs. used (total)      731  
   data-arc span      10411 days (28.50 yr)  
   first obs. used      1991-08-02  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56327  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:39:54  

Additional Information
 Earth MOID = .910113 au 
 Jupiter MOID = 2.18803 au 
 T_jup = 3.477 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.6   n/a MPO259613  
diameter diameter 2.406 km 0.113 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.254   0.058 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39957 (1998 FG121)          Discovered 1998-Mar-20 by LINEAR at Socorro
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 FG121 = 1991 PW19 = 1999 TO126 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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