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4557 Mika (1987 XD)
Classification: Main-belt Asteroid          SPK-ID: 2004557
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04835257404459072 1.5316e-08  
a 3.023136073262634 1.4222e-08 au
q 2.876959662433329 4.5507e-08 au
i 11.28273347712841 9.1617e-07 deg
node 113.0592793711257 4.9083e-06 deg
peri 34.9071665400383 2.858e-05 deg
M 32.94569815169701 2.6338e-05 deg
tp 2459024.796187772563
(2020-Jun-24.29618777)
0.0001403 TDB
period 1919.928122652923
5.26
1.3548e-05
3.709e-08
d
yr
n .1875070195349597 1.3232e-09 deg/d
Q 3.169312484091939 1.491e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2559  
   data-arc span      23893 days (65.42 yr)  
   first obs. used      1955-10-23  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43723  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:42:55  

Additional Information
 Earth MOID = 1.89735 au 
 Jupiter MOID = 1.88873 au 
 T_jup = 3.214 
[ 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 12.06   n/a E2021B10  
diameter diameter 14.005 km 0.175 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 17.2401 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.188   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

4557 Mika (1987 XD)          Discovered 1987-Dec-14 by Yanai and Watanabe at Kitami
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1987 XD = 1966 WN = 1983 AL4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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