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21669 (1999 RF8)
Classification: Main-belt Asteroid          SPK-ID: 2021669
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1835183205911285 4.4001e-08  
a 2.311865556013523 7.3674e-09 au
q 1.887595871741446 9.9679e-08 au
i 2.334185622217076 3.8062e-06 deg
node 320.1733016484715 9.9741e-05 deg
peri 202.5948010485531 0.00010018 deg
M 201.3835378236212 1.0502e-05 deg
tp 2459766.202433527491
(2022-Jul-05.70243353)		 3.8601e-05 TDB
period 1283.932785258053
3.52		 6.1374e-06
1.68e-08		 d
yr
n .280388509533733 1.3403e-09 deg/d
Q 2.736135240285601 8.7194e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1209  
   data-arc span      9836 days (26.93 yr)  
   first obs. used      1994-01-04  
   last obs. used      2020-12-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48998  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:53:53  

Additional Information
 Earth MOID = .895657 au 
 Jupiter MOID = 2.24528 au 
 T_jup = 3.560 
[ 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 15.41   n/a E2021B10  

21669 (1999 RF8)          Discovered 1999-Sep-04 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 RF8 = 1998 KY20 = 2000 WP137 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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