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4059 Balder (1987 SB5)
Classification: Main-belt Asteroid          SPK-ID: 2004059
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 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0686381558182949 3.5604e-08  
a 3.018523576809662 1.5628e-08 au
q 2.811337685203404 1.0512e-07 au
i 9.465249416296755 4.1254e-06 deg
node 238.0756822813993 2.0886e-05 deg
peri 30.30707183681752 3.4993e-05 deg
M 169.0559645665174 2.8934e-05 deg
tp 2458100.964551286854
(2017-Dec-13.46455129)
0.00015359 TDB
period 1915.535854455559
5.24
1.4876e-05
4.073e-08
d
yr
n .1879369676963424 1.4595e-09 deg/d
Q 3.225709468415921 1.67e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2565  
   data-arc span      23999 days (65.71 yr)  
   first obs. used      1954-05-23  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42632  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:02:50  

Additional Information
 Earth MOID = 1.8003 au 
 Jupiter MOID = 1.82957 au 
 T_jup = 3.223 
[ 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 11.4   n/a MPO332856  
diameter diameter 17.019 km 0.206 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 9.7215 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.097   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4059 Balder (1987 SB5)          Discovered 1987-Sep-29 by Jensen, P. at Brorfelde
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1987 SB5 = 1956 XQ = 1977 TC4 = 1977 TM7 = 1977 VG2 = 1983 XW1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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