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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1175312276856579 1.7996e-08  
a 3.111793800782208 1.1807e-08 au
q 2.746060855071655 6.0064e-08 au
i 12.53629626672497 8.0168e-07 deg
node 147.8653377340756 5.6004e-06 deg
peri 356.3689785803294 6.3946e-06 deg
M 255.3949703140507 8.114e-06 deg
tp 2459783.092259388867
(2022-Jul-22.59225939)
4.6584e-05 TDB
period 2005.001231868716
5.49
1.1411e-05
3.124e-08
d
yr
n .1795510118786661 1.0219e-09 deg/d
Q 3.47752674649276 1.3195e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3521  
   data-arc span      29583 days (80.99 yr)  
   first obs. used      1940-03-09  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39416  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:13:07  

Additional Information
 Earth MOID = 1.75825 au 
 Jupiter MOID = 1.53282 au 
 T_jup = 3.171 
[ 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 11.04   n/a E2021B10  
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. 2020-October); 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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