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15250 Nishiyamahiro (1990 DZ)
Classification: Main-belt Asteroid          SPK-ID: 2015250
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1702162589795161 6.4409e-08  
a 2.939929126510088 1.3645e-08 au
q 2.439505388930625 1.9117e-07 au
i 9.585925610563477 5.7439e-06 deg
node 337.8142441242492 1.9216e-05 deg
peri 217.6486780357407 2.4855e-05 deg
M 338.8175029770219 1.8335e-05 deg
tp 2459108.837390722738
(2020-Sep-16.33739072)
9.3991e-05 TDB
period 1841.211667249539
5.04
1.2818e-05
3.509e-08
d
yr
n .195523418846123 1.3612e-09 deg/d
Q 3.440352864089552 1.5968e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1582  
   data-arc span      11063 days (30.29 yr)  
   first obs. used      1990-02-28  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54121  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 17:48:56  

Additional Information
 Earth MOID = 1.44757 au 
 Jupiter MOID = 1.5816 au 
 T_jup = 3.231 
[ 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 13.8   n/a MPO279676  
diameter diameter 4.918 km 0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.764 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.]
geometric albedo albedo 0.265   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

15250 Nishiyamahiro           Discovered 1990 Feb. 28 by K. Endate and K. Watanabe at Kitami.
Hiroshi Nishiyama (b. 1962) has been a director of the Baienno Sato Observatory since 1998. He was previously a teacher of earth sciences in a high school. His interests include observations of various galaxies, searching for supernovae and astronomical teaching.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20100527/MPCPages.arcLast Updated: 2010-12-06

[ show close-approach data ]
Alternate Designations
 1990 DZ = 1995 DS13 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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