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9870 Maehata (1992 DA)
Classification: Main-belt Asteroid          SPK-ID: 2009870
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1666808810848084 4.4516e-08  
a 2.342068583834979 7.9501e-09 au
q 1.951690528720315 1.0572e-07 au
i 3.70445234091811 4.269e-06 deg
node 27.53148752352907 5.259e-05 deg
peri 164.4485699122393 5.3694e-05 deg
M 180.2480589056174 1.316e-05 deg
tp 2459254.185614799249
(2021-Feb-08.68561480)
4.9318e-05 TDB
period 1309.175410818882
3.58
6.666e-06
1.825e-08
d
yr
n .274982249914717 1.4001e-09 deg/d
Q 2.732446638949642 9.2752e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1933  
   data-arc span      23826 days (65.23 yr)  
   first obs. used      1954-09-04  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53428  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 22:14:38  

Additional Information
 Earth MOID = .951997 au 
 Jupiter MOID = 2.22361 au 
 T_jup = 3.542 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456740.5 (2014-Mar-24.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1663064432813636 4.4575e-08  
q 1.952743277519559 1.0583e-07 au
tp 2456635.798516888452
(2013-Dec-09.29851689)
4.4841e-05 TDB
node 27.54585803712576 5.2581e-05 deg
peri 164.4930172489209 5.369e-05 deg
i 3.70503297290082 4.2688e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1933  
   data-arc span      23826 days (65.23 yr)  
   first obs. used      1954-09-04  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53428  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 22:14:38  

Additional Information
 Jupiter MOID = 2.22361 au 
 T_jup = 3.542 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.986935149524985E-15 -4.708313135866448E-15 -7.610190905048218E-13 -2.464028622030352E-15 -1.2889566449104E-13 -1.289503587813804E-15
q -4.708313135866448E-15 1.119955921124209E-14 1.844422385340303E-12 6.250762112591147E-15 3.158258046368157E-13 3.199608148727619E-15
tp -7.610190905048218E-13 1.844422385340303E-12 2.010701659214008E-9 -1.248110652381044E-12 4.926782691663678E-10 2.24866113254993E-12
node -2.464028622030352E-15 6.250762112591147E-15 -1.248110652381044E-12 2.764776994300972E-9 -2.759156160667706E-9 -3.997524588767061E-11
peri -1.2889566449104E-13 3.158258046368157E-13 4.926782691663678E-10 -2.759156160667706E-9 2.882629839705811E-9 4.043164541815567E-11
i -1.289503587813804E-15 3.199608148727619E-15 2.24866113254993E-12 -3.997524588767061E-11 4.043164541815567E-11 1.82230431563356E-11

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 13.9   n/a MPO452309  
diameter diameter 4.135 km 0.061 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.358   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

9870 Maehata           Discovered 1992 Feb. 24 by T. Seki at Geisei.
Hideko Maehata (née Hideco Hyodo, 1914-1995), born in Hashimoto city, Wakayama Prefecture, won the gold medal for the 200-m breast-stroke event in the 1936 Olympuic Games in Berlin. She was the first Japanese female Olympic gold medalist.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050125/MPCPages.arcLast Updated: 2005-06-01

[ show close-approach data ]
Alternate Designations
 1992 DA = 1974 DW = 1979 SM13 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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