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

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2076434114068172 9.9351e-09  
a 2.248381798717283 4.3167e-09 au
q 1.781520131886631 2.2093e-08 au
i 5.915702091741122 3.5223e-07 deg
node 328.4162606203462 8.0407e-06 deg
peri 345.7320713463588 8.5168e-06 deg
M 326.3633310146349 5.0634e-06 deg
tp 2459511.557252428018
1.7511e-05 TDB
period 1231.412387835074
n .2923472295360858 8.4193e-10 deg/d
Q 2.715243465547936 5.2131e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2677  
   data-arc span      24357 days (66.69 yr)  
   first obs. used      1954-10-20  
   last obs. used      2021-06-27  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43557  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 13:01:18  

Additional Information
 Earth MOID = .767882 au 
 Jupiter MOID = 2.57533 au 
 T_jup = 3.593 
[ 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 13.47   n/a MPCxxxxx  
diameter diameter 4.989 km 0.371 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 5.92 h n/a LCDB (Rev. 2020-October); 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:
[Stephens, R.D.; Warner, B.D. (2019) Minor Planet Bull. 45, 66-71.]
geometric albedo albedo 0.258   0.078 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

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

Alternate Designations
 1967 JL = 1954 UG = 1971 SU2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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