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21360 Bobduff (1997 GW30)
Classification: Main-belt Asteroid          SPK-ID: 2021360
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1195540360995901 3.3641e-08  
a 3.193961081330496 1.7992e-08 au
q 2.812110142912424 1.1342e-07 au
i .5106619682470405 4.3405e-06 deg
node 200.9786749699824 0.00039412 deg
peri 61.61574328308392 0.00039455 deg
M 341.5576993237892 1.8808e-05 deg
tp 2459307.308411056845
(2021-Apr-02.80841106)		 0.00010908 TDB
period 2084.936616940811
5.71		 1.7617e-05
4.823e-08		 d
yr
n .1726671195061178 1.459e-09 deg/d
Q 3.575812019748569 2.0143e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1491  
   data-arc span      14233 days (38.97 yr)  
   first obs. used      1981-07-02  
   last obs. used      2020-06-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51351  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:43:59  

Additional Information
 Earth MOID = 1.79483 au 
 Jupiter MOID = 1.48887 au 
 T_jup = 3.185 
[ 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 13.84   n/a E2021B10  
diameter diameter 8.841 km 0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.075   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21360 Bobduff           Discovered 1997 Apr. 8 by Spacewatch at Kitt Peak.
Robert Ian Duff (b. 1946) is an amateur astronomer who has served as Librarian and Outreach Coordinator for the Royal Astronomical Society of Canada, London Centre. Name suggested and citation prepared by Robert Jedicke and Peter 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 2016-08-18Last Updated: 2016-11-23

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Alternate Designations
 1997 GW30 = 1981 NH 
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