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3720 Hokkaido (1987 UR1)
Classification: Main-belt Asteroid          SPK-ID: 2003720
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1265738211551159 1.2277e-08  
a 2.319721067336428 7.0582e-09 au
q 2.026105107829633 2.7954e-08 au
i 6.789139038743904 9.5991e-07 deg
node 19.23620323890945 2.7477e-06 deg
peri 285.6276576314266 9.2291e-06 deg
M 220.2640956115294 8.3984e-06 deg
tp 2459701.407559841982
(2022-May-01.90755984)
3.0908e-05 TDB
period 1290.482373390586
3.53
5.8898e-06
1.613e-08
d
yr
n .2789654530918882 1.2732e-09 deg/d
Q 2.613337026843224 7.9516e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2267  
   data-arc span      18796 days (51.46 yr)  
   first obs. used      1969-10-07  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48188  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:10:18  

Additional Information
 Earth MOID = 1.02225 au 
 Jupiter MOID = 2.61685 au 
 T_jup = 3.558 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.41   n/a MPCxxxxx  
diameter diameter 4.250 km 0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.79 h n/a LCDB (Rev. 2020-October); 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:
[Warner, B.D. (2013) Minor Planet Bull. 40, 137-145.]
geometric albedo albedo 0.563   0.149 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3720 Hokkaido (1987 UR1)          Discovered 1987-Oct-28 by Ueda, S. and Kaneda, H. at Kushiro
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1987 UR1 = 1969 TF = 1980 TX13 = 1980 VJ2 = 1980 XS1 = 1982 FN2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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