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JPL Small-Body Database Browser
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11820 Mikiyasato (1981 EP38)
Classification: Main-belt Asteroid          SPK-ID: 2011820
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.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06992230268138834 5.0431e-08  
a 3.047259335302282 1.9351e-08 au
q 2.83418794571059 1.5879e-07 au
i 10.4590762235334 5.3778e-06 deg
node 192.9164577868306 2.0622e-05 deg
peri 162.5348054036419 3.6489e-05 deg
M 321.9390867563297 2.9654e-05 deg
tp 2459205.918358777531
0.00016048 TDB
period 1942.95414527946
n .1852848667965966 1.7649e-09 deg/d
Q 3.260330724893975 2.0704e-08 au
  Orbit Determination Parameters
   # obs. used (total)      937  
   data-arc span      24794 days (67.88 yr)  
   first obs. used      1951-09-09  
   last obs. used      2019-07-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53175  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 20:09:46  

Additional Information
 Earth MOID = 1.83236 au 
 Jupiter MOID = 2.10056 au 
 T_jup = 3.209 
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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 14.1   n/a MPO435811  
diameter diameter 5.388 km 0.189 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 6.419 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]
geometric albedo albedo 0.153   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

11820 Mikiyasato           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring.
Mikiya Sato (b. 1967) is a Japanese amateur astronomer who studies dust trails of meteor showers, notably the Phoenicids.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2017-03-12Last Updated: 2017-04-19

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2030-Oct-13 21:03 00:01 Juno 0.0388769197838555 0.038875168191849 0.0388786715813698 3.67342239203392 3.67342230684497 2462788.376740142 1.23014574894645 227.688124644476 64.8112374828583 74.4700682953155 86628.3072484655 T 20 CATAB v2.0f-lin.ifort 2020-Feb-22 20:09:59 2020-Feb-22 20:10
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Feb-28 10:33 UT
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