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4289 Biwako (1989 UA2)
Classification: Main-belt Asteroid          SPK-ID: 2004289
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1556164753333252 3.5106e-08  
a 2.297517317659553 7.238e-09 au
q 1.939985770668098 8.1612e-08 au
i 5.461719049872789 3.6619e-06 deg
node 75.89591743651772 4.138e-05 deg
peri 340.7553134076268 4.3278e-05 deg
M 275.1671661174156 1.4243e-05 deg
tp 2459300.242338726855
(2021-Mar-26.74233873)
5.1044e-05 TDB
period 1271.998552954394
3.48
6.0109e-06
1.646e-08
d
yr
n .283019189891254 1.3374e-09 deg/d
Q 2.655048864651008 8.3643e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2033  
   data-arc span      23516 days (64.38 yr)  
   first obs. used      1956-03-16  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45806  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:13:56  

Additional Information
 Earth MOID = .953074 au 
 Jupiter MOID = 2.67199 au 
 T_jup = 3.572 
[ 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 12.8   n/a MPO337287  
diameter diameter 7.694 km 0.197 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 4.4185 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Martinez, L. (2011) Minor Planet Bull. 38, 120.]
geometric albedo albedo 0.248   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

4289 Biwako (1989 UA2)          Discovered 1989-Oct-29 by Sugie, A. at Dynic
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1989 UA2 = 1968 UX2 = 1973 DA = 1975 XF7 = 1978 PX4 = 1980 BH1 = 1980 DF2 = 1982 VR1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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