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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07123348768714341 2.9483e-08  
a 2.447582402795069 6.9161e-09 au
q 2.273232571842297 7.3091e-08 au
i 5.819252658034546 3.5651e-06 deg
node 52.75805253173157 3.8446e-05 deg
peri 32.7034621051419 4.9938e-05 deg
M 47.49459732723464 3.0993e-05 deg
tp 2459015.978864183528
(2020-Jun-15.47886418)
0.00012042 TDB
period 1398.635058136152
3.83
5.9282e-06
1.623e-08
d
yr
n .2573938054146468 1.091e-09 deg/d
Q 2.62193223374784 7.4088e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2897  
   data-arc span      32609 days (89.28 yr)  
   first obs. used      1931-10-12  
   last obs. used      2021-01-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40571  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:54:49  

Additional Information
 Earth MOID = 1.29115 au 
 Jupiter MOID = 2.51877 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 11.52   n/a E2021B10  
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. 2020-October); 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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