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20657 Alvarez-Candal (1999 TL261)
Classification: Main-belt Asteroid          SPK-ID: 2020657
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1794597998026824 5.0039e-08  
a 3.114559391818577 2.5462e-08 au
q 2.555621186889251 1.6201e-07 au
i 15.0333637344069 4.7437e-06 deg
node 124.6378838205075 1.8529e-05 deg
peri 254.2985370099219 2.2686e-05 deg
M 283.520897863106 1.6553e-05 deg
tp 2459427.014334892862
(2021-Jul-31.51433489)
9.5535e-05 TDB
period 2007.67472775232
5.50
2.4619e-05
6.74e-08
d
yr
n .1793119149350631 2.1988e-09 deg/d
Q 3.673497596747903 3.0031e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1019  
   data-arc span      13845 days (37.91 yr)  
   first obs. used      1982-07-20  
   last obs. used      2020-06-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5148  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:44:37  

Additional Information
 Earth MOID = 1.60571 au 
 Jupiter MOID = 1.99487 au 
 T_jup = 3.141 
[ 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 13.8   n/a MPO449103  
diameter diameter 10.366 km 0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.033   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20657 Alvarez-Candal           Discovered 1999 Oct. 14 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Alvaro Alvarez-Candal (b. 1977) is a planetary scientist who works at Paris Observatory. Using spectroscopy, he studies minor planets, transneptunian objects and the relationship between minor planets and comets.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

Alternate Designations
 1999 TL261 = 2000 AH200 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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