Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
21330 Alanwhitman (1997 AT20)
Classification: Main-belt Asteroid          SPK-ID: 2021330
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09577896882234418 4.1979e-08  
a 2.5922879997025 9.6591e-09 au
q 2.344001328200457 1.0907e-07 au
i 4.320902542466012 3.3015e-06 deg
node 295.40921181569 6.0883e-05 deg
peri 57.45492801341873 6.3628e-05 deg
M 346.1863147821954 1.7998e-05 deg
tp 2459058.996563784260
(2020-Jul-28.49656378)
7.6177e-05 TDB
period 1524.48551058561
4.17
8.5206e-06
2.333e-08
d
yr
n .2361452421162803 1.3198e-09 deg/d
Q 2.840574671204543 1.0584e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1414  
   data-arc span      8710 days (23.85 yr)  
   first obs. used      1997-01-11  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51201  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:16:24  

Additional Information
 Earth MOID = 1.34159 au 
 Jupiter MOID = 2.53623 au 
 T_jup = 3.408 
[ 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 14.5   n/a MPO395208  
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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jan-16 10:21 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin