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66777 (1999 TD221)
Classification: Main-belt Asteroid          SPK-ID: 2066777
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09062548077780121 5.0805e-08  
a 2.726818601996653 1.756e-08 au
q 2.479699355196854 1.4109e-07 au
i 5.076259547980321 4.9903e-06 deg
node 337.444702723418 5.5042e-05 deg
peri 40.3111270322708 6.0387e-05 deg
M 257.6035925568664 2.7425e-05 deg
tp 2459668.305170838991
(2022-Mar-29.80517084)
0.00012765 TDB
period 1644.685255149836
4.50
1.5887e-05
4.35e-08
d
yr
n .2188868653578358 2.1144e-09 deg/d
Q 2.973937848796451 1.9151e-08 au
  Orbit Determination Parameters
   # obs. used (total)      595  
   data-arc span      10368 days (28.39 yr)  
   first obs. used      1992-01-27  
   last obs. used      2020-06-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56592  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 12:24:54  

Additional Information
 Earth MOID = 1.48194 au 
 Jupiter MOID = 2.46411 au 
 T_jup = 3.344 
[ 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 15.44   n/a E2021B10  
diameter diameter 4.008 km 0.280 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.083   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

66777 (1999 TD221)          Discovered 1999-Oct-02 by CSS at Catalina
Reference: 20030910/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 TD221 = 2001 CY8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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