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4391 Balodis (1977 QW2)
Classification: Main-belt Asteroid          SPK-ID: 2004391
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2137800190823798 1.8486e-08  
a 2.38870372971691 7.1444e-09 au
q 1.878046600795878 4.3946e-08 au
i 5.352453547797186 7.8672e-07 deg
node 190.2788273882783 2.7947e-06 deg
peri 108.4581316765491 4.6966e-06 deg
M 290.6267347167027 5.5398e-06 deg
tp 2459460.355249131853
(2021-Sep-02.85524913)
2.1583e-05 TDB
period 1348.471767985098
3.69
6.0498e-06
1.656e-08
d
yr
n .2669688817719306 1.1977e-09 deg/d
Q 2.899360858637943 8.6718e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2125  
   data-arc span      15919 days (43.58 yr)  
   first obs. used      1977-08-21  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51142  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:36:08  

Additional Information
 Earth MOID = .869034 au 
 Jupiter MOID = 2.34695 au 
 T_jup = 3.496 
[ 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 14.2   n/a MPO502195  
diameter diameter 3.359 km 0.170 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 3.448 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:
[Carbognani, A. (2011) Minor Planet Bull. 38, 57-63.]
geometric albedo albedo 0.393   0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

4391 Balodis (1977 QW2)          Discovered 1977-Aug-21 by Chernykh, N. S. at Nauchnyj
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1977 QW2 = 1977 RR2 = 1980 GZ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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