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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1555555942567482 9.5645e-09  
a 2.296765165801115 5.8833e-09 au
q 1.939490495566724 2.3705e-08 au
i 5.461563671936973 2.1097e-07 deg
node 75.88879658020467 3.2562e-06 deg
peri 340.8798668524059 5.4973e-06 deg
M 331.6743990809549 7.0116e-06 deg
tp 2459300.534532600708
(2021-Mar-27.03453260)
2.4923e-05 TDB
period 1271.373971524157
3.48
4.8851e-06
1.337e-08
d
yr
n .2831582272904505 1.088e-09 deg/d
Q 2.654039836035506 6.7985e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2578  
   data-arc span      23745 days (65.01 yr)  
   first obs. used      1956-03-16  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4279  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:32:13  

Additional Information
 Earth MOID = .951865 au 
 Jupiter MOID = 2.67291 au 
 T_jup = 3.572 
[ 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 12.92   n/a MPCxxxxx  
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. 2020-October); 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

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 ]
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