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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .207432579931382 3.5055e-08  
a 2.248708408535249 4.8659e-09 au
q 1.78225302183939 7.8217e-08 au
i 5.91540236942075 3.9636e-06 deg
node 328.4152036537237 2.8932e-05 deg
peri 345.6832388110882 2.9951e-05 deg
M 210.6391538111272 9.302e-06 deg
tp 2459511.513539710602
(2021-Oct-24.01353971)
3.2716e-05 TDB
period 1231.680718139382
3.37
3.9978e-06
1.095e-08
d
yr
n .2922835396366584 9.4869e-10 deg/d
Q 2.715163795231108 5.8752e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2512  
   data-arc span      23973 days (65.63 yr)  
   first obs. used      1954-10-20  
   last obs. used      2020-06-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44019  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:13:35  

Additional Information
 Earth MOID = .769244 au 
 Jupiter MOID = 2.57614 au 
 T_jup = 3.593 
[ 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 13.3   n/a MPO412178  
diameter diameter 4.989 km 0.371 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
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] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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

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Alternate Designations
 1967 JL = 1954 UG = 1971 SU2 
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