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21777 (1999 RS221)
Classification: Main-belt Asteroid          SPK-ID: 2021777
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02386203116053041 4.7783e-08  
a 2.975060375147526 1.8018e-08 au
q 2.904069391771297 1.4731e-07 au
i 8.387923379653644 4.1535e-06 deg
node 275.4651822795009 3.0426e-05 deg
peri 232.0584343621634 9.8417e-05 deg
M 316.0608799997043 9.4643e-05 deg
tp 2459625.265724890005
(2022-Feb-14.76572489)
0.0004932 TDB
period 1874.312934802687
5.13
1.7027e-05
4.662e-08
d
yr
n .1920703812663482 1.7449e-09 deg/d
Q 3.046051358523756 1.8448e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1307  
   data-arc span      9260 days (25.35 yr)  
   first obs. used      1995-12-14  
   last obs. used      2021-04-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49128  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:36:39  

Additional Information
 Earth MOID = 1.92643 au 
 Jupiter MOID = 2.03086 au 
 T_jup = 3.245 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457490.5 (2016-Apr-12.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02128625603751549 4.8281e-08  
q 2.910741299775998 1.4812e-07 au
tp 2457774.121143659371
(2017-Jan-20.62114366)
0.00054515 TDB
node 275.6146469162637 3.0501e-05 deg
peri 236.434053344568 0.00010842 deg
i 8.376621006051177 4.1493e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1307  
   data-arc span      9260 days (25.35 yr)  
   first obs. used      1995-12-14  
   last obs. used      2021-04-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49128  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:36:39  

Additional Information
 Jupiter MOID = 2.03086 au 
 T_jup = 3.245 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.331011307087208E-15 -7.102827909416842E-15 -2.86765589329789E-14 -4.867593350217731E-15 1.133558458634862E-13 1.36336887693912E-15
q -7.102827909416842E-15 2.193861768072919E-14 1.843277923761485E-12 1.315595444594035E-14 -1.736179597671115E-14 -3.069669777646604E-15
tp -2.86765589329789E-14 1.843277923761485E-12 2.971904426214811E-7 1.018466076368249E-10 5.672721474267381E-8 1.609217762891609E-11
node -4.867593350217731E-15 1.315595444594035E-14 1.018466076368249E-10 9.303194016822186E-10 -9.010279676492317E-10 -1.749149433869544E-12
peri 1.133558458634862E-13 -1.736179597671115E-14 5.672721474267381E-8 -9.010279676492317E-10 1.175413189163304E-8 4.812209964222965E-12
i 1.36336887693912E-15 -3.069669777646604E-15 1.609217762891609E-11 -1.749149433869544E-12 4.812209964222965E-12 1.721656759623887E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.92   n/a E2021B10  

21777 (1999 RS221)          Discovered 1999-Sep-05 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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