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21865 (1999 TD246)
Classification: Main-belt Asteroid          SPK-ID: 2021865
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1256543179640169 2.0985e-08  
a 2.587649177850133 1.0144e-08 au
q 2.262499885277225 5.5506e-08 au
i 13.46604503464285 8.6535e-07 deg
node 192.6740643435144 4.2259e-06 deg
peri 33.10532260719034 6.4897e-06 deg
M 207.5020229265395 6.5391e-06 deg
tp 2459844.547803099810
(2022-Sep-22.04780310)
3.0468e-05 TDB
period 1520.395309927572
4.16
8.9402e-06
2.448e-08
d
yr
n .2367805252024551 1.3923e-09 deg/d
Q 2.912798470423041 1.1418e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2566  
   data-arc span      11102 days (30.40 yr)  
   first obs. used      1990-10-11  
   last obs. used      2021-03-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43812  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:04:52  

Additional Information
 Earth MOID = 1.26566 au 
 Jupiter MOID = 2.07351 au 
 T_jup = 3.372 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.46   n/a E2021B10  
diameter diameter 5.170 km 0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.321   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21865 (1999 TD246)          Discovered 1999-Oct-08 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 TD246 = 1990 TP16 = 1993 FV25 = 1997 HW4 = 1998 QB64 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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