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20630 (1999 TJ90)
Classification: Outer Main-belt Asteroid          SPK-ID: 2020630
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2810484275888934 4.8558e-08  
a 3.999309149717063 3.7241e-08 au
q 2.875309601747209 1.9854e-07 au
i 2.355557779495637 4.3808e-06 deg
node 127.4329138078917 0.0001383 deg
peri 276.2550601906964 0.0001385 deg
M 214.0494958115971 1.0357e-05 deg
tp 2460384.847072282430
(2024-Mar-15.34707228)
9.5914e-05 TDB
period 2921.298205803343
8.00
4.0804e-05
1.117e-07
d
yr
n .1232328829986741 1.7213e-09 deg/d
Q 5.123308697686919 4.7707e-08 au
  Orbit Determination Parameters
   # obs. used (total)      666  
   data-arc span      10493 days (28.73 yr)  
   first obs. used      1991-10-02  
   last obs. used      2020-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .58429  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:25:29  

Additional Information
 Earth MOID = 1.88472 au 
 Jupiter MOID = .318193 au 
 T_jup = 2.982 
[ 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 14.13   n/a E2021B10  
diameter diameter 12.006 km 1.264 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
geometric albedo albedo 0.023   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  

20630 (1999 TJ90)          Discovered 1999-Oct-02 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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