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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 49 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07127209294748718 1.4154e-08  
a 2.447256264673955 6.3951e-09 au
q 2.272835188711792 3.5819e-08 au
i 5.8194907574125 8.658e-07 deg
node 52.75254176659403 4.6736e-06 deg
peri 32.58921825209521 1.1616e-05 deg
M 98.06061665317246 1.1903e-05 deg
tp 2459015.601099124490
(2020-Jun-15.10109912)
4.6148e-05 TDB
period 1398.355517181498
3.83
5.4812e-06
1.501e-08
d
yr
n .2574452602193824 1.0091e-09 deg/d
Q 2.621677340636117 6.8509e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3315  
   data-arc span      32758 days (89.69 yr)  
   first obs. used      1931-10-12  
   last obs. used      2021-06-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38811  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:18:17  

Additional Information
 Earth MOID = 1.29103 au 
 Jupiter MOID = 2.51907 au 
 T_jup = 3.487 
[ 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 11.53   n/a MPCxxxxx  
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

Alternate Designations
 1935 UB = 1931 TV3 = 1933 FC = A916 WK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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