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JPL Small-Body Database Browser
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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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1174372791753142 3.1677e-08  
a 3.111619166722096 1.3422e-08 au
q 2.746199077952495 9.8646e-08 au
i 12.53631460492752 3.6482e-06 deg
node 147.8653263010609 1.5542e-05 deg
peri 356.433643671434 2.1385e-05 deg
M 219.3992615833502 1.5826e-05 deg
tp 2459783.502564722603
(2022-Jul-23.00256472)
9.0295e-05 TDB
period 2004.832453047466
5.49
1.2971e-05
3.551e-08
d
yr
n .1795661275598259 1.1618e-09 deg/d
Q 3.477039255491697 1.4998e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2885  
   data-arc span      29140 days (79.78 yr)  
   first obs. used      1940-03-09  
   last obs. used      2019-12-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42312  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:09:52  

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 1.63023957647616 1.63023853023006 1.63024062273098 3.31362629374159 3.15293205067155 2420777.154887288 2.10081653123027 207.47707952234 14.7957676523444 75.8552609646823 3641593.22468087 T 36 CATAB v2.0f-lin.ifort 2020-Feb-22 16:10:23 2020-Feb-22 16:10
1925-Dec-16 17:36 00:02 Jupiter 1.75485716656334 1.75485600006325 1.75485833306482 3.14895885415682 2.99175458128733 2424501.233399575 1.90601990708054 114.169216042776 36.2926981022795 -62.9667659586706 3766500.59942203 T 36 CATAB v2.0f-lin.ifort 2020-Feb-22 16:10:23 2020-Feb-22 16:10
1987-Aug-27 19:09 < 00:01 Jupiter 1.82173225691447 1.82173163047452 1.82173288335463 3.12888737203999 2.97657979752438 2447035.297951666 0.676036012109856 50.1529722458361 19.7853043754387 61.2554932478449 3816171.92400391 T 36 CATAB v2.0f-lin.ifort 2020-Feb-22 16:10:23 2020-Feb-22 16:10
1997-Oct-25 12:33 < 00:01 Jupiter 1.58821286539209 1.5882125587207 1.58821317206348 3.32856564514915 3.16428716228846 2450747.022798314 0.390378685563917 64.463466902384 14.2641998964573 87.7745961749182 3594842.75992309 T 36 CATAB v2.0f-lin.ifort 2020-Feb-22 16:10:23 2020-Feb-22 16:10
2069-Aug-22 15:38 00:01 Jupiter 1.5634559758786 1.56345563657683 1.563456315181 3.29419257821794 3.12540858927364 2476981.151149643 1.1030370183933 124.648007903568 14.5460429485968 86.1129045266919 3442626.92929701 T 36 CATAB v2.0f-lin.ifort 2020-Feb-22 16:10:23 2020-Feb-22 16:10
2079-Oct-31 09:02 00:01 Jupiter 1.87708168896549 1.87708066876313 1.87708270916797 3.19543280324858 3.05095101407762 2480702.876690036 1.4202311662645 66.0840625769729 49.7543451879167 -73.3477023892281 3839216.95870237 T 36 CATAB v2.0f-lin.ifort 2020-Feb-22 16:10:23 2020-Feb-22 16:10
2141-Jul-05 23:06 00:03 Jupiter 1.69889408956964 1.69889269592642 1.69889548322135 3.04360780859104 2.87513525531125 2503230.462219459 2.79618933925188 213.018318004767 18.6742856688934 69.5327778150367 3261510.85484935 T 36 CATAB v2.0f-lin.ifort 2020-Feb-22 16:10:23 2020-Feb-22 16:10
2151-Sep-13 08:39 00:03 Jupiter 1.65944435989698 1.65944286590956 1.65944585389327 3.33969337277139 3.18319039122085 2506951.860597513 2.82302737688834 220.890282833925 25.0344235378762 -71.2336150880455 3886983.30063538 T 36 CATAB v2.0f-lin.ifort 2020-Feb-22 16:10:23 2020-Feb-22 16:10

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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