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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1174372795342504 3.1506e-08  
a 3.111619166753994 1.3372e-08 au
q 2.746199076863774 9.8215e-08 au
i 12.53631437902511 3.6384e-06 deg
node 147.8653264885342 1.5458e-05 deg
peri 356.4336434735235 2.1304e-05 deg
M 219.3992615776351 1.582e-05 deg
tp 2459783.502564766471
(2022-Jul-23.00256477)
9.0275e-05 TDB
period 2004.832453078294
5.49
1.2924e-05
3.538e-08
d
yr
n .1795661275570647 1.1575e-09 deg/d
Q 3.477039256644214 1.4943e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2969  
   data-arc span      29367 days (80.40 yr)  
   first obs. used      1940-03-09  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41857  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:44:10  

Additional Information
 Earth MOID = 1.75851 au 
 Jupiter MOID = 1.5339 au 
 T_jup = 3.172 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456762.5 (2014-Apr-15.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1141273156786733 3.1756e-08  
q 2.760443621174774 9.8776e-08 au
tp 2455769.885503405519
(2011-Jul-27.38550341)
8.441e-05 TDB
node 148.0439524402892 1.5447e-05 deg
peri 356.6127418979921 2.1536e-05 deg
i 12.53277834789977 3.6385e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2969  
   data-arc span      29367 days (80.40 yr)  
   first obs. used      1940-03-09  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41857  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:44:10  

Additional Information
 Jupiter MOID = 1.5339 au 
 T_jup = 3.172 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.008467759505213E-15 -3.113836685312863E-15 3.206633708382503E-13 -7.410671691650143E-17 5.483126281962989E-14 -4.470699703415656E-16
q -3.113836685312863E-15 9.756727029016417E-15 -8.369903543054576E-13 2.191701716475901E-15 -1.331274284557184E-13 2.049396598102132E-15
tp 3.206633708382503E-13 -8.369903543054576E-13 7.124976681747101E-9 -3.22151441450349E-12 1.281952409634976E-9 -1.036006809098049E-12
node -7.410671691650143E-17 2.191701716475901E-15 -3.22151441450349E-12 2.386166637750314E-10 -2.328285636570617E-10 5.675169237159372E-12
peri 5.483126281962989E-14 -1.331274284557184E-13 1.281952409634976E-9 -2.328285636570617E-10 4.637941112372306E-10 -5.627311082570661E-12
i -4.470699703415656E-16 2.049396598102132E-15 -1.036006809098049E-12 5.675169237159372E-12 -5.627311082570661E-12 1.323857856572474E-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 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-August); 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

[ show close-approach data ]
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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