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21330 Alanwhitman (1997 AT20)
Classification: Main-belt Asteroid          SPK-ID: 2021330
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09564545006307278 4.1761e-08  
a 2.591954960829554 9.4581e-09 au
q 2.344046262057797 1.0844e-07 au
i 4.320926379303264 3.1182e-06 deg
node 295.4095218096556 6.0422e-05 deg
peri 57.52032448652989 6.3135e-05 deg
M 33.36830883343669 1.7639e-05 deg
tp 2459059.223053855980
(2020-Jul-28.72305386)
7.4801e-05 TDB
period 1524.191737307448
4.17
8.3427e-06
2.284e-08
d
yr
n .2361907568374278 1.2928e-09 deg/d
Q 2.839863659601311 1.0363e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1513  
   data-arc span      8821 days (24.15 yr)  
   first obs. used      1997-01-11  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50809  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:43:32  

Additional Information
 Earth MOID = 1.33991 au 
 Jupiter MOID = 2.53644 au 
 T_jup = 3.409 
[ 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 14.66   n/a MPCxxxxx  
diameter diameter 3.394 km 0.676 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.292   0.116 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21330 Alanwhitman           Discovered 1997 Jan. 11 by Spacewatch at Kitt Peak.
Alan Douglas Whitman (b. 1946) is a Canadian amateur astronomer and former weather service officer. He is a skillful observer and has written and lectured widely. Name suggested by R. and P. Jedicke.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2016-06-20Last Updated: 2016-06-21

Alternate Designations
 1997 AT20 = 1999 RF28 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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