Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2075452236491129 1.0003e-08  
a 2.24835260656289 4.4329e-09 au
q 1.781717761991729 2.2165e-08 au
i 5.915678044349168 3.5253e-07 deg
node 328.416228471307 8.0502e-06 deg
peri 345.7209629638807 8.5187e-06 deg
M 269.0625084948396 5.0245e-06 deg
tp 2459511.553812985599
(2021-Oct-24.05381299)
1.7717e-05 TDB
period 1231.388405611135
3.37
3.6417e-06
9.97e-09
d
yr
n .2923529232203001 8.6461e-10 deg/d
Q 2.714987451134051 5.3529e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2615  
   data-arc span      24244 days (66.38 yr)  
   first obs. used      1954-10-20  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43959  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:12:22  

Additional Information
 Earth MOID = .766726 au 
 Jupiter MOID = 2.57623 au 
 T_jup = 3.594 
[ 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 13.49   n/a E2021B10  
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

[ show close-approach data ]
Alternate Designations
 1967 JL = 1954 UG = 1971 SU2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-23 15:35 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin