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21474 Pamelatsai (1998 HO99)
Classification: Main-belt Asteroid          SPK-ID: 2021474
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ 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 .08614122382676151 3.7144e-08  
a 2.377370881846481 9.9144e-09 au
q 2.172581244594117 8.9799e-08 au
i 6.382036215272104 5.0152e-06 deg
node 185.1140115377301 3.2465e-05 deg
peri 75.54427302959746 4.5523e-05 deg
M 28.63098894925694 2.9868e-05 deg
tp 2459094.017636030907
(2020-Sep-01.51763603)
0.00011131 TDB
period 1338.886725038133
3.67
8.3753e-06
2.293e-08
d
yr
n .2688801026014704 1.682e-09 deg/d
Q 2.582160519098844 1.0768e-08 au
  Orbit Determination Parameters
   # obs. used (total)      956  
   data-arc span      9620 days (26.34 yr)  
   first obs. used      1994-03-14  
   last obs. used      2020-07-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55116  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:46:02  

Additional Information
 Earth MOID = 1.16659 au 
 Jupiter MOID = 2.45709 au 
 T_jup = 3.527 
[ 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 15.71   n/a E2020-QM5  

21474 Pamelatsai           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Pamela Tsai mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. She teaches at the Monta Vista High School, Cupertino, California.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050224/MPCPages.arcLast Updated: 2005-02-28

[ show close-approach data ]
Alternate Designations
 1998 HO99 = 1999 TS141 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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