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4486 Mithra (1987 SB)
Classification: Apollo [NEO, PHA]          SPK-ID: 2004486
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 223 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6630233901661572 2.0974e-08  
a 2.199297518688506 4.2442e-09 au
q .7411118218636353 4.667e-08 au
i 3.039697278616015 2.0441e-06 deg
node 82.23626068718747 5.9767e-05 deg
peri 168.9065201884084 5.8851e-05 deg
M 33.94875006242828 7.1004e-06 deg
tp 2458888.157084252589
2.3173e-05 TDB
period 1191.308946417666
n .3021886145340725 8.7474e-10 deg/d
Q 3.657483215513377 7.0581e-09 au
  Orbit Determination Parameters
   # obs. used (total)      909  
   # delay obs. used      8  
   # Doppler obs. used      9  
   data-arc span      12353 days (33.82 yr)  
   first obs. used      1987-01-29  
   last obs. used      2020-11-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53023  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-29 05:19:00  

Additional Information
 Earth MOID = .0462892 au 
 Jupiter MOID = 1.40489 au 
 T_jup = 3.338 
[ 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 15.5   n/a MPO502196  
diameter diameter 1.849 km 0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (  
extent extent 2.35 x 1.65 x 1.44 km n/a Brozovic et al., 2010, Icarus, 208:207-220  
rotation period rot_per 67.5 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:
[Brozovic, M.; Benner, L.A.M.; Magri, C.; Ostro, S.J.; et al. (2010) Icarus 208, 207-220.]
geometric albedo albedo 0.297   0.056 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (  

4486 Mithra (1987 SB)          Discovered 1987-Sep-22 by Elst and Shkodrov at Rozhen
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1987 SB = 1974 DN1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Dec-02 07:24 UT
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