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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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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07095210964461841 3.2174e-08  
a 2.446811559403865 7.4572e-09 au
q 2.273205117361322 8.0231e-08 au
i 5.820108587179337 3.9111e-06 deg
node 52.76211700247444 4.016e-05 deg
peri 32.92375473255988 5.1504e-05 deg
M 252.8068115446334 3.1748e-05 deg
tp 2459016.759253086394
(2020-Jun-16.25925309)
0.00012335 TDB
period 1397.974379440147
3.83
6.391e-06
1.75e-08
d
yr
n .2575154489913977 1.1773e-09 deg/d
Q 2.620418001446408 7.9863e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2486  
   data-arc span      32194 days (88.14 yr)  
   first obs. used      1931-10-12  
   last obs. used      2019-12-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42194  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:58:37  

Additional Information
 Earth MOID = 1.29147 au 
 Jupiter MOID = 2.52129 au 
 T_jup = 3.488 
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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

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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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