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20628 (1999 TS40)
Classification: Outer Main-belt Asteroid          SPK-ID: 2020628
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2200042995592674 3.8027e-08  
a 3.993423120503451 3.3804e-08 au
q 3.114852864033305 1.5635e-07 au
i 6.546474551037036 4.0886e-06 deg
node 146.5838157113273 3.9061e-05 deg
peri 278.408620066082 4.035e-05 deg
M 201.6765282005162 1.3233e-05 deg
tp 2460482.414980853753
(2024-Jun-20.91498085)
0.00011734 TDB
period 2914.851397977339
7.98
3.7011e-05
1.013e-07
d
yr
n .1235054384761466 1.5682e-09 deg/d
Q 4.871993376973597 4.1241e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1414  
   data-arc span      10583 days (28.97 yr)  
   first obs. used      1991-09-17  
   last obs. used      2020-09-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53511  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:25:26  

Additional Information
 Earth MOID = 2.1371 au 
 Jupiter MOID = .678001 au 
 T_jup = 3.001 
[ 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 12.57   n/a E2021B10  
diameter diameter 17.936 km 0.338 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
rotation period rot_per 68.1 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Warner, B.D.; Stephens, R.D. (2018) Minor Planet Bull. 45, 262-265.]
geometric albedo albedo 0.046   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  

20628 (1999 TS40)          Discovered 1999-Oct-05 by CSS at Catalina
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 TS40 = 1991 SY4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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