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1612 Hirose (1950 BJ)
Classification: Main-belt Asteroid          SPK-ID: 2001612
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0933813456741593 4.7614e-08  
a 3.102468990835061 1.7507e-08 au
q 2.812756261558532 1.5053e-07 au
i 16.83668492663555 4.4971e-06 deg
node 319.480655485627 1.6244e-05 deg
peri 244.1605805988163 2.9517e-05 deg
M 262.954273940373 2.7471e-05 deg
tp 2459538.563477123936
(2021-Nov-20.06347712)
0.00015405 TDB
period 1995.995698415422
5.46
1.6895e-05
4.626e-08
d
yr
n .180361110139564 1.5267e-09 deg/d
Q 3.39218172011159 1.9142e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2224  
   data-arc span      29832 days (81.68 yr)  
   first obs. used      1939-01-18  
   last obs. used      2020-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40267  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 15:34:18  

Additional Information
 Earth MOID = 1.8593 au 
 Jupiter MOID = 1.76424 au 
 T_jup = 3.149 
[ 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 10.8   n/a MPO425816  
diameter diameter 18.956 km 0.380 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 12.295 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.113   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1612 Hirose (1950 BJ)          Discovered 1950-Jan-23 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1950 BJ = 1939 CD = 1952 PD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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