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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1836870601622906 4.402e-08  
a 2.311650208014765 7.3012e-09 au
q 1.887029977180986 9.9754e-08 au
i 2.334179438694183 3.8008e-06 deg
node 320.1729327828377 9.9701e-05 deg
peri 202.5913298055976 0.00010014 deg
M 256.3622739957397 1.0585e-05 deg
tp 2459766.070229128494
(2022-Jul-05.57022913)
3.8513e-05 TDB
period 1283.753393824837
3.51
6.082e-06
1.665e-08
d
yr
n .2804276909659493 1.3286e-09 deg/d
Q 2.736270438848545 8.6423e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1219  
   data-arc span      9836 days (26.93 yr)  
   first obs. used      1994-01-04  
   last obs. used      2020-12-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48982  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:51:26  

Additional Information
 Earth MOID = .896153 au 
 Jupiter MOID = 2.24451 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

[ show close-approach data ]
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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