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21857 (1999 TJ154)
Classification: Main-belt Asteroid          SPK-ID: 2021857
[ 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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06960427623396134 4.1232e-08  
a 2.852095441724787 1.5037e-08 au
q 2.653577402753353 1.1578e-07 au
i 2.456770291756251 4.5811e-06 deg
node 152.8427104340824 9.363e-05 deg
peri 175.6428981189022 9.834e-05 deg
M 196.3779216695018 2.9566e-05 deg
tp 2460000.120487131237
(2023-Feb-24.62048713)		 0.00014421 TDB
period 1759.318658609101
4.82		 1.3913e-05
3.809e-08		 d
yr
n .2046246700325524 1.6182e-09 deg/d
Q 3.050613480696221 1.6083e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1676  
   data-arc span      9603 days (26.29 yr)  
   first obs. used      1994-10-04  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50892  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:46  

Additional Information
 Earth MOID = 1.64019 au 
 Jupiter MOID = 2.18349 au 
 T_jup = 3.300 
[ 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 13.89   n/a E2021B10  
diameter diameter 4.852 km 0.438 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.248   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21857 (1999 TJ154)          Discovered 1999-Oct-07 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 TJ154 = 1994 TA7 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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