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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1174372771649237 2.9052e-08  
a 3.11161916583062 1.2718e-08 au
q 2.746199083421281 9.2034e-08 au
i 12.53631215879886 3.3812e-06 deg
node 147.8653341268094 1.4713e-05 deg
peri 356.4336368410893 2.0673e-05 deg
M 219.3992611575628 1.5799e-05 deg
tp 2459783.502566757310
(2022-Jul-23.00256676)
9.0219e-05 TDB
period 2004.832452185892
5.49
1.2292e-05
3.365e-08
d
yr
n .1795661276369942 1.1009e-09 deg/d
Q 3.477039248239959 1.4212e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3281  
   data-arc span      29464 days (80.67 yr)  
   first obs. used      1940-03-09  
   last obs. used      2020-11-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40171  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:03:52  

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. 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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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 1.63023955661214 1.63023855963097 1.63024055360118 3.31362599842611 3.15293173829693 2420777.154901711 2.00970563690442 198.361147450676 14.5431637861543 75.8769427014933 3724308.39345838 T 40 CATAB v2.0f-lin.ifort 2020-Dec-18 02:04:00 2020-Dec-18 02:04
1925-Dec-16 17:36 00:02 Jupiter 1.75485717108575 1.75485602169963 1.75485832047317 3.14895828219019 2.99175397968199 2424501.233403903 1.82429337699712 107.363489802238 34.5032690600419 -61.3531295899328 4315725.06237208 T 40 CATAB v2.0f-lin.ifort 2020-Dec-18 02:04:00 2020-Dec-18 02:04
1987-Aug-27 19:09 < 00:01 Jupiter 1.82173219075152 1.82173158213615 1.82173279936699 3.12888732289314 2.97657974018961 2447035.297962443 0.662338350406411 46.9023857389611 19.632656747182 60.2528641016124 3831910.9082882 T 40 CATAB v2.0f-lin.ifort 2020-Dec-18 02:04:00 2020-Dec-18 02:04
1997-Oct-25 12:33 < 00:01 Jupiter 1.58821288263011 1.58821259951606 1.58821316574417 3.32856512417786 3.16428661609952 2450747.022796825 0.385862891011862 62.7124865228653 13.1332702537338 88.3891105898244 3940013.3089655 T 40 CATAB v2.0f-lin.ifort 2020-Dec-18 02:04:00 2020-Dec-18 02:04
2069-Aug-22 15:38 00:01 Jupiter 1.56345595652418 1.56345562025046 1.56345629279861 3.29419220862423 3.12540819757462 2476981.151140719 1.02583760748275 115.584956085095 14.1624406798914 85.4946712224795 3614937.40160518 T 40 CATAB v2.0f-lin.ifort 2020-Dec-18 02:04:00 2020-Dec-18 02:04
2079-Oct-31 09:02 00:01 Jupiter 1.87708172407721 1.87708081311999 1.87708263503453 3.19543229804379 3.05095048771479 2480702.876662791 1.32795732269526 64.2552507153071 42.9887875175208 -68.802756808726 4691807.45916076 T 40 CATAB v2.0f-lin.ifort 2020-Dec-18 02:04:00 2020-Dec-18 02:04
2141-Jul-05 23:06 00:03 Jupiter 1.6988940041235 1.69889269430654 1.6988953139478 3.04360771698343 2.87513514961415 2503230.462185176 2.62437467586856 198.814369053963 18.553896538665 69.5032448905734 3309255.88919451 T 40 CATAB v2.0f-lin.ifort 2020-Dec-18 02:04:00 2020-Dec-18 02:04
2151-Sep-13 08:39 00:03 Jupiter 1.65944440973842 1.65944305223156 1.65944576725359 3.33969283742949 3.18318983437474 2506951.860554707 2.65388180096427 210.785531848085 22.5984177395844 -72.0524144628803 4354735.20432782 T 40 CATAB v2.0f-lin.ifort 2020-Dec-18 02:04:00 2020-Dec-18 02:04

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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