Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1174372794975007 3.1666e-08  
a 3.111619166786344 1.3418e-08 au
q 2.746199077006676 9.8618e-08 au
i 12.53631446070123 3.6477e-06 deg
node 147.8653259956463 1.5533e-05 deg
peri 356.4336439574387 2.1376e-05 deg
M 219.3992615731411 1.5825e-05 deg
tp 2459783.502564803708
(2022-Jul-23.00256480)
9.029e-05 TDB
period 2004.832453109559
5.49
1.2968e-05
3.55e-08
d
yr
n .1795661275542645 1.1615e-09 deg/d
Q 3.477039256566012 1.4994e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2894  
   data-arc span      29307 days (80.24 yr)  
   first obs. used      1940-03-09  
   last obs. used      2020-06-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4227  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:39:38  

Additional Information
 Earth MOID = 1.75851 au 
 Jupiter MOID = 1.5339 au 
 T_jup = 3.172 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456733.5 (2014-Mar-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1141179706570134 3.1911e-08  
q 2.760492728997495 9.9162e-08 au
tp 2455769.823371075197
(2011-Jul-27.32337108)
8.4513e-05 TDB
node 148.0440139185121 1.5523e-05 deg
peri 356.6053585582441 2.1609e-05 deg
i 12.53267318960078 3.6477e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2894  
   data-arc span      29307 days (80.24 yr)  
   first obs. used      1940-03-09  
   last obs. used      2020-06-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4227  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:39:38  

Additional Information
 Jupiter MOID = 1.5339 au 
 T_jup = 3.172 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.018331532054868E-15 -3.141268267094909E-15 3.080642932384302E-13 -9.744376812735704E-17 5.20746918614894E-14 -4.457000099980194E-16
q -3.141268267094909E-15 9.833044389860454E-15 -8.017364431556984E-13 2.260559261152715E-15 -1.254158135347293E-13 2.042400571027135E-15
tp 3.080642932384302E-13 -8.017364431556984E-13 7.142505795726259E-9 -3.50331179845477E-12 1.286030493984191E-9 -9.829152305485122E-13
node -9.744376812735704E-17 2.260559261152715E-15 -3.50331179845477E-12 2.409501710002101E-10 -2.351574939794164E-10 5.279215711813934E-12
peri 5.20746918614894E-14 -1.254158135347293E-13 1.286030493984191E-9 -2.351574939794164E-10 4.669464614984136E-10 -5.231318283018611E-12
i -4.457000099980194E-16 2.042400571027135E-15 -9.829152305485122E-13 5.279215711813934E-12 -5.231318283018611E-12 1.330582294196664E-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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Aug-11 11:03 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin