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21385 (1998 FV8)
Classification: Main-belt Asteroid          SPK-ID: 2021385
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1617037155608969 3.7167e-08  
a 2.399021758200432 1.1071e-08 au
q 2.011091026187986 9.2629e-08 au
i 2.38346169684218 3.9445e-06 deg
node 81.74231476630841 0.00010961 deg
peri 185.1489845251092 0.00011096 deg
M 347.3964794275549 2.1213e-05 deg
tp 2459248.015913277333
(2021-Feb-02.51591328)
8.0172e-05 TDB
period 1357.218301149745
3.72
9.3945e-06
2.572e-08
d
yr
n .2652484126503687 1.836e-09 deg/d
Q 2.786952490212878 1.2861e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1101  
   data-arc span      10540 days (28.86 yr)  
   first obs. used      1991-07-13  
   last obs. used      2020-05-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55755  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:44:31  

Additional Information
 Earth MOID = .993387 au 
 Jupiter MOID = 2.29293 au 
 T_jup = 3.508 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456904.5 (2014-Sep-04.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1624319190254511 3.7096e-08  
q 2.009171012431087 9.2533e-08 au
tp 2456532.730756490077
(2013-Aug-28.23075649)
6.9693e-05 TDB
node 81.77731020926242 0.0001096 deg
peri 185.0260506090124 0.00011093 deg
i 2.383856053150738 3.945e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1101  
   data-arc span      10540 days (28.86 yr)  
   first obs. used      1991-07-13  
   last obs. used      2020-05-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55755  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:44:31  

Additional Information
 Jupiter MOID = 2.29293 au 
 T_jup = 3.508 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.376097724352894E-15 -3.416886623094824E-15 -5.893071477236041E-13 2.062066108880054E-15 -1.335212322494564E-13 9.901114783842226E-17
q -3.416886623094824E-15 8.562425818713181E-15 1.69565990562688E-12 -6.685889111801072E-15 3.906688104980817E-13 -1.042036316211421E-16
tp -5.893071477236041E-13 1.69565990562688E-12 4.85715308288477E-9 -2.240061000861865E-11 1.219922852467144E-9 7.593033145713337E-13
node 2.062066108880054E-15 -6.685889111801072E-15 -2.240061000861865E-11 1.20114486290263E-8 -1.200615779578828E-8 -1.628126604289426E-11
peri -1.335212322494564E-13 3.906688104980817E-13 1.219922852467144E-9 -1.200615779578828E-8 1.230562220905102E-8 1.64556049230194E-11
i 9.901114783842226E-17 -1.042036316211421E-16 7.593033145713337E-13 -1.628126604289426E-11 1.64556049230194E-11 1.556296037359234E-11

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 15.53   n/a E2021B10  
diameter diameter 1.910 km 0.327 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.232   0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21385 (1998 FV8)          Discovered 1998-Mar-22 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1998 FV8 = 1991 NF9 = 1994 CG20 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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