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1991 Darwin (1967 JL)
Classification: Main-belt Asteroid          SPK-ID: 2001991
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2080423267267177 4.3471e-08  
a 2.248193711120223 7.9832e-09 au
q 1.780474260526398 9.8554e-08 au
i 5.919512831923282 4.8826e-06 deg
node 328.4764371641371 4.199e-05 deg
peri 345.5570147264531 4.3247e-05 deg
M 161.6063431000816 1.4592e-05 deg
tp 2457047.780327927169
4.7708e-05 JED
period 1231.257871004438
n .292383917681126 1.5574e-09 deg/d
Q 2.715913161714048 9.644e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1414  
   data-arc span      22430 days (61.41 yr)  
   first obs. used      1954-10-20  
   last obs. used      2016-03-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .4943  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Mar-24 15:33:40  

Additional Information
 Earth MOID = .766954 au 
 Jupiter MOID = 2.56507 au 
 T_jup = 3.593 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.4 mag n/a MPO263363  
rotation period rot_per 4.7 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Science XXVI, 1511-1512.]

1991 Darwin           Discovered 1967 May 6 by C. U. Cesco and A. R. Klemola at the Yale-Columbia Southern Station, El Leoncito.
Named in memory of Charles Darwin (1809-1882), the English naturalist who first established the theory of organic evolution; much of his research was done in Argentina, and he crossed the Andes at a pass located some 100 km south of El Leoncito. This planet also honors his second son, George Darwin (1845-1912), the astronomer noted for his pioneering application of detailed dynamical analyses to problems of cosmogony and geology.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5282Last Updated: 2007-10-23

[ show close-approach data ]
Alternate Designations
 1967 JL = 1954 UG = 1971 SU2 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-May-05 14:16 UT
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