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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 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 
[ 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 1.63023957565751 1.63023852959859 1.63024062172504 3.31362627624725 3.15293203220284 2420777.154873761 2.10039183899771 207.434236133959 14.7953008132361 75.854945781386 3641605.10782064 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:39:51 2020-Jun-23 15:39
1925-Dec-16 17:36 00:02 Jupiter 1.75485716415135 1.75485599772488 1.75485833057922 3.14895880656121 2.99175453096901 2424501.233390193 1.90564543476656 114.138634158146 36.2870292763388 -62.960808808826 3768455.40164577 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:39:51 2020-Jun-23 15:39
1987-Aug-27 19:09 < 00:01 Jupiter 1.8217322550524 1.82173162867189 1.82173288143312 3.12888734981904 2.97657977400675 2447035.297946655 0.675984362350402 50.140182163482 19.785142960466 61.2541080258006 3816624.80867031 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:39:51 2020-Jun-23 15:39
1997-Oct-25 12:33 < 00:01 Jupiter 1.58821286413034 1.58821255757505 1.58821317068563 3.3285656146517 3.1642871300738 2450747.022800322 0.390363272328796 64.4526890870925 14.258551341817 87.7749778590031 3595680.37180675 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:39:51 2020-Jun-23 15:39
2069-Aug-22 15:38 00:01 Jupiter 1.56345597569219 1.56345563640303 1.56345631498196 3.29419254917492 3.12540855864151 2476981.151147014 1.1026289317851 124.596365033122 14.5454203887487 86.1112597928294 3442849.09020334 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:39:51 2020-Jun-23 15:39
2079-Oct-31 09:02 00:01 Jupiter 1.87708168214701 1.87708066255518 1.87708270173884 3.19543278555842 3.05095099501247 2480702.876693939 1.41974374108963 66.0821683893968 49.7191659033388 -73.3289433562427 3842914.79815468 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:39:51 2020-Jun-23 15:39
2141-Jul-05 23:06 00:03 Jupiter 1.69889409367158 1.69889270051749 1.69889548683416 3.04360779560344 2.87513524198131 2503230.462218045 2.79531487961062 212.947068889414 18.6738512678274 69.5336335302611 3261515.98480905 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:39:51 2020-Jun-23 15:39
2151-Sep-13 08:39 00:03 Jupiter 1.6594443522787 1.65944285898677 1.65944584557959 3.33969333945508 3.18319035553038 2506951.860600034 2.82216618937182 220.836816668529 25.0244793524422 -71.2376944027876 3888467.68695587 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:39:51 2020-Jun-23 15:39

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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