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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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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 226 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6628014970308455 2.0948e-08  
a 2.19944469480083 4.1692e-09 au
q .7416494584502891 4.6603e-08 au
i 3.039311151789895 2.0161e-06 deg
node 82.24097394208343 5.8908e-05 deg
peri 168.9097730167983 5.8001e-05 deg
M 153.62475635077 7.4202e-06 deg
tp 2458888.075228250307
(2020-Feb-08.57522825)
2.3119e-05 TDB
period 1191.428531297209
3.26
3.3876e-06
9.275e-09
d
yr
n .3021582835590125 8.5914e-10 deg/d
Q 3.657239931151372 6.9325e-09 au
  Orbit Determination Parameters
   # obs. used (total)      916  
   # delay obs. used      8  
   # Doppler obs. used      9  
   data-arc span      12366 days (33.86 yr)  
   first obs. used      1987-01-29  
   last obs. used      2020-12-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52941  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:24:31  

Additional Information
 Earth MOID = .0463191 au 
 Jupiter MOID = 1.40303 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 15.52   n/a E2021B10  
diameter diameter 1.849 km 0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
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. 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:
[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] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  

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

[ show close-approach data ]
Alternate Designations
 1987 SB = 1974 DN1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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