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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 
[ 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 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1915-Oct-06 15:43 00:02 Jupiter 1.6302395702374 1.63023852706465 1.63024061341868 3.31362625848723 3.15293201298977 2420777.154878124 2.094650184302 206.867447950634 14.7860573635619 75.8553271929115 3642912.88738142 T 38 CATAB v2.0f-lin.ifort 2020-Aug-24 22:44:37 2020-Aug-24 22:44
1925-Dec-16 17:36 00:02 Jupiter 1.75485716894331 1.75485600357231 1.7548583343157 3.14895880113608 2.99175452569937 2424501.233394006 1.90053756754488 113.723044938118 36.2096894578246 -62.8796763519976 3793710.33594196 T 38 CATAB v2.0f-lin.ifort 2020-Aug-24 22:44:37 2020-Aug-24 22:44
1987-Aug-27 19:09 < 00:01 Jupiter 1.82173225168287 1.82173162615751 1.82173287720834 3.1288873547854 2.97657977893831 2447035.297946298 0.675166292619942 49.976877456684 19.7830311712952 61.2279243217483 3819335.73800484 T 38 CATAB v2.0f-lin.ifort 2020-Aug-24 22:44:37 2020-Aug-24 22:44
1997-Oct-25 12:33 < 00:01 Jupiter 1.58821286469414 1.5882125596476 1.58821316974068 3.32856559317801 3.1642871075451 2450747.022797646 0.390095452927757 64.3278317662231 14.1899450013782 87.8011405009346 3608927.73590349 T 38 CATAB v2.0f-lin.ifort 2020-Aug-24 22:44:37 2020-Aug-24 22:44
2069-Aug-22 15:38 00:01 Jupiter 1.56345597455356 1.5634556354154 1.56345631369234 3.29419254487668 3.12540855398491 2476981.151144323 1.09763487612474 123.992143010615 14.5294475972068 86.0806774062402 3447999.15955395 T 38 CATAB v2.0f-lin.ifort 2020-Aug-24 22:44:37 2020-Aug-24 22:44
2079-Oct-31 09:02 00:01 Jupiter 1.87708168283855 1.87708067039155 1.87708269528555 3.19543275186383 3.05095095977671 2480702.876683735 1.41375422462499 66.0348340530911 49.3038272323553 -73.0765839026541 3886381.55394437 T 38 CATAB v2.0f-lin.ifort 2020-Aug-24 22:44:37 2020-Aug-24 22:44
2141-Jul-05 23:06 00:03 Jupiter 1.69889409132254 1.69889270377855 1.69889547887483 3.04360776714336 2.8751352116138 2503230.462228333 2.78428722129711 212.041894460702 18.6715458255054 69.5365769769566 3262010.30852723 T 38 CATAB v2.0f-lin.ifort 2020-Aug-24 22:44:37 2020-Aug-24 22:44
2151-Sep-13 08:39 00:03 Jupiter 1.65944435299987 1.65944286841842 1.65944583759018 3.33969331466465 3.1831903295908 2506951.860593688 2.81129374976164 220.176689938169 24.8938904361229 -71.2890332481585 3908834.1030527 T 38 CATAB v2.0f-lin.ifort 2020-Aug-24 22:44:37 2020-Aug-24 22:44

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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