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1375 Alfreda (1935 UB)
Classification: Main-belt Asteroid          SPK-ID: 2001375
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07113556580556701 3.13e-08  
a 2.447402372755671 7.329e-09 au
q 2.273305020215809 7.8247e-08 au
i 5.819601786562041 3.8507e-06 deg
node 52.76332112289236 3.8991e-05 deg
peri 32.76130899194198 5.0491e-05 deg
M 355.962071260934 3.1406e-05 deg
tp 2459016.186015561426
(2020-Jun-15.68601556)
0.000122 TDB
period 1398.480747686316
3.83
6.2818e-06
1.72e-08
d
yr
n .2574222066307267 1.1563e-09 deg/d
Q 2.621499725295533 7.8503e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2621  
   data-arc span      32257 days (88.31 yr)  
   first obs. used      1931-10-12  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41755  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:53:09  

Additional Information
 Earth MOID = 1.29162 au 
 Jupiter MOID = 2.51949 au 
 T_jup = 3.487 
[ 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 MPO431509  
diameter diameter 13.928 km 0.174 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 19.14 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pligge, Z.; Monnier, A.; Pharo, J.; Stolze, K.; Yim, A.; Ditteon, R. (2011) Minor Planet Bull. 38, 5-7.]
geometric albedo albedo 0.204   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1375 Alfreda (1935 UB)          Discovered 1935-Oct-22 by Delporte, E. at Uccle
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1935 UB = 1931 TV3 = 1933 FC = A916 WK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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