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4252 Godwin (1985 RG4)
Classification: Main-belt Asteroid          SPK-ID: 2004252
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1385721196118216 4.468e-08  
a 2.654127811739181 1.5443e-08 au
q 2.286339695145797 1.1831e-07 au
i 13.49881333748418 6.424e-06 deg
node 164.0316936130506 2.0142e-05 deg
peri 59.19035984202931 3.1544e-05 deg
M 153.4836885541562 2.3324e-05 deg
tp 2456927.149940112064
0.00010229 JED
period 1579.360151187173
n .2279404097471975 1.9895e-09 deg/d
Q 3.021915928332565 1.7584e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1314  
   data-arc span      11556 days (31.64 yr)  
   first obs. used      1984-04-19  
   last obs. used      2015-12-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49561  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 12:51:37  

Additional Information
 Earth MOID = 1.31212 au 
 Jupiter MOID = 2.02316 au 
 T_jup = 3.336 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.7 mag n/a MPO298992  
rotation period rot_per 11.623 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Casalnuovo, G.B. (2015) Minor Planet Bul. 42, 139-141.]

4252 Godwin           Discovered 1985 Sept. 11 by H. Debehogne at the European Southern Observatory.
Richard Godwin (b. 1955), a board member of the Space Frontier Foundation, served as executive director of The Watch, a support organization for NEO detection. His brother Robert Godwin (b. 1958) is a space expert and space-history researcher. Together they founded a space book company and write extensively on space.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20071124/MPCPages.arcLast Updated: 2007-11-26

Alternate Designations
 1985 RG4 = 1984 HE 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
FirstGov 2016-May-06 13:02 UT
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