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21213 (1994 RL7)
Classification: Main-belt Asteroid          SPK-ID: 2021213
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2046493900217488 4.0249e-08  
a 2.765266811709723 1.1511e-08 au
q 2.199356645445942 1.1038e-07 au
i 1.873914162077119 4.8819e-06 deg
node 322.5285004804703 0.00012914 deg
peri 170.9937978847316 0.00012963 deg
M 191.9943275274104 1.0651e-05 deg
tp 2460180.336410707538
(2023-Aug-23.83641071)
5.0849e-05 TDB
period 1679.592740541259
4.60
1.0487e-05
2.871e-08
d
yr
n .2143376732409476 1.3383e-09 deg/d
Q 3.331176977973504 1.3866e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1371  
   data-arc span      9826 days (26.90 yr)  
   first obs. used      1994-09-12  
   last obs. used      2021-08-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52431  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:41:21  

Additional Information
 Earth MOID = 1.21427 au 
 Jupiter MOID = 1.71658 au 
 T_jup = 3.308 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456676.5 (2014-Jan-19.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .207679097914385 4.013e-08  
q 2.185672788742945 1.1069e-07 au
tp 2456824.610127814495
(2014-Jun-16.11012781)
4.6715e-05 TDB
node 322.5907134069906 0.00012943 deg
peri 170.0710392579982 0.0001299 deg
i 1.876303053554896 4.8681e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1371  
   data-arc span      9826 days (26.90 yr)  
   first obs. used      1994-09-12  
   last obs. used      2021-08-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52431  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:41:21  

Additional Information
 Jupiter MOID = 1.71658 au 
 T_jup = 3.308 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.610418612622021E-15 -4.428647035757629E-15 4.182290334303391E-13 -6.822003039529031E-15 8.525726318105681E-14 -3.90301382197227E-16
q -4.428647035757629E-15 1.225252798282618E-14 -1.181778015762601E-12 1.882903202263086E-14 -2.440042106123862E-13 1.11025969748462E-15
tp 4.182290334303391E-13 -1.181778015762601E-12 2.182277938355102E-9 -6.33737956755645E-12 5.336223237081659E-10 -6.354481870278932E-13
node -6.822003039529031E-15 1.882903202263086E-14 -6.33737956755645E-12 1.675251267945509E-8 -1.674422193265321E-8 1.429087373198052E-10
peri 8.525726318105681E-14 -2.440042106123862E-13 5.336223237081659E-10 -1.674422193265321E-8 1.68741326626623E-8 -1.429779534771759E-10
i -3.90301382197227E-16 1.11025969748462E-15 -6.354481870278932E-13 1.429087373198052E-10 -1.429779534771759E-10 2.369800418139869E-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 14.37   n/a E2021B10  
diameter diameter 3.245 km 0.129 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.292   0.116 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21213 (1994 RL7)          Discovered 1994-Sep-12 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1994 RL7 = 1996 AH2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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