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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1195156485793935 3.3651e-08  
a 3.194135426786265 1.8148e-08 au
q 2.812386259603487 1.1347e-07 au
i .5106318098373429 4.3593e-06 deg
node 200.9800779965815 0.00039415 deg
peri 61.54843235022668 0.00039459 deg
M 307.0781375804271 1.879e-05 deg
tp 2459307.021564827649
(2021-Apr-02.52156483)
0.00010928 TDB
period 2085.10733169402
5.71
1.7771e-05
4.865e-08
d
yr
n .172652982668054 1.4715e-09 deg/d
Q 3.575884593969044 2.0317e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1477  
   data-arc span      14233 days (38.97 yr)  
   first obs. used      1981-07-02  
   last obs. used      2020-06-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51393  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:57:28  

Additional Information
 Earth MOID = 1.79684 au 
 Jupiter MOID = 1.48962 au 
 T_jup = 3.185 
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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 13.8   n/a MPO302195  
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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