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2675 Tolkien (1982 GB)
Classification: Main-belt Asteroid          SPK-ID: 2002675
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

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 two-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 is not working, here are some notes that might help.
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1012642012948165 3.762e-08  
a 2.212784234610193 5.7929e-09 au
q 1.98870840645463 8.3883e-08 au
i 2.751405900286575 4.1846e-06 deg
node 5.841700236901981 6.8469e-05 deg
peri 2.068235818679355 7.0493e-05 deg
M 35.87418327547903 1.7559e-05 deg
tp 2458880.691797756808
5.8505e-05 TDB
period 1202.283895255402
n .2994301108254676 1.1758e-09 deg/d
Q 2.436860062765756 6.3795e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2885  
   data-arc span      30363 days (83.13 yr)  
   first obs. used      1937-09-14  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42901  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:07:07  

Additional Information
 Earth MOID = .987349 au 
 Jupiter MOID = 2.96499 au 
 T_jup = 3.648 
[ 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 12.2   n/a MPO347541  
diameter diameter 10.960 km 0.186 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 1060. h n/a LCDB (Rev. 2019-August); 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:
[Durkee, R.I.; Brinsfield, J.W.; Hornoch, K.; Kusnirak, P. (2011) Minor Planet Bull. 38, 182-183.]
geometric albedo albedo 0.213   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

2675 Tolkien (1982 GB)          Discovered 1982-Apr-14 by Watt, M. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1982 GB = 1934 VO = 1937 RH = 1939 FR = 1949 FO = 1950 QA1 = 1952 DX = 1969 JE = 1969 KB = 1970 RB = 1973 QX = 1975 BV 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Nov-28 11:40 UT
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