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1999 Hirayama (1973 DR)
Classification: Main-belt Asteroid          SPK-ID: 2001999
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1168439591447741 3.1696e-08  
a 3.113293942055749 1.3617e-08 au
q 2.749524351884515 9.885e-08 au
i 12.53186196324957 3.6492e-06 deg
node 147.8695713801703 1.5594e-05 deg
peri 356.5880415798208 2.1495e-05 deg
M 147.40023722495 1.5737e-05 deg
tp 2457778.968352060018
(2017-Jan-25.46835206)
8.5942e-05 TDB
period 2006.45127054336
5.49
1.3164e-05
3.604e-08
d
yr
n .1794212524795131 1.1771e-09 deg/d
Q 3.477063532226984 1.5208e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2860  
   data-arc span      29126 days (79.74 yr)  
   first obs. used      1940-03-09  
   last obs. used      2019-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42246  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 21:09:00  

Additional Information
 Earth MOID = 1.76226 au 
 Jupiter MOID = 1.53508 au 
 T_jup = 3.171 
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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 10.9   n/a MPO431517  
diameter diameter 38.277 km 0.400 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 15.63 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Menke, J.; Cooney, W.; Gross, J.; Terrell, D. (2008) Minor Planet Bull. 35, 155-160.]
geometric albedo albedo 0.053   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1999 Hirayama (1973 DR)          Discovered 1973-Feb-27 by Kohoutek, L. at Bergedorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1973 DR = 1935 GF = 1940 EH = 1951 EY1 = 1951 FA = 1965 UF = 1969 NB = 1975 NE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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