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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1700409352537848 6.4348e-08  
a 2.939314764007 1.3583e-08 au
q 2.439510932529992 1.9088e-07 au
i 9.586300202625853 5.7301e-06 deg
node 337.815264550193 1.9206e-05 deg
peri 217.6640151424512 2.4835e-05 deg
M 17.9159479224374 1.8399e-05 deg
tp 2459108.898019901243
(2020-Sep-16.39801990)
9.3886e-05 TDB
period 1840.63455521956
5.04
1.2759e-05
3.493e-08
d
yr
n .1955847232027312 1.3557e-09 deg/d
Q 3.439118595484008 1.5893e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1590  
   data-arc span      11063 days (30.29 yr)  
   first obs. used      1990-02-28  
   last obs. used      2020-06-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54028  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 00:52:50  

Additional Information
 Earth MOID = 1.44696 au 
 Jupiter MOID = 1.58178 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 13.85   n/a E2021B10  
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. 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:
[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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