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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07095210951206102 3.227e-08  
a 2.44681155938717 7.4696e-09 au
q 2.273205117670154 8.0432e-08 au
i 5.820108585849048 3.9124e-06 deg
node 52.76211692757158 4.0303e-05 deg
peri 32.92375477907627 5.1613e-05 deg
M 252.8068115897722 3.1756e-05 deg
tp 2459016.759252906848
(2020-Jun-16.25925291)
0.00012339 TDB
period 1397.974379425839
3.83
6.4016e-06
1.753e-08
d
yr
n .2575154489940333 1.1792e-09 deg/d
Q 2.620418001104185 7.9996e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2470  
   data-arc span      32188 days (88.13 yr)  
   first obs. used      1931-10-12  
   last obs. used      2019-11-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42324  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:21:24  

Additional Information
 Earth MOID = 1.29147 au 
 Jupiter MOID = 2.52129 au 
 T_jup = 3.488 
[ 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-January); 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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