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1939 Loretta (1974 UC)
Classification: Main-belt Asteroid          SPK-ID: 2001939
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1251294787821887 3.1255e-08  
a 3.124016984254482 1.389e-08 au
q 2.733110367308014 9.729e-08 au
i .9053589541220893 3.6047e-06 deg
node 40.4781159370014 0.00021761 deg
peri 189.5530058594905 0.00021809 deg
M 203.3925204063853 1.5932e-05 deg
tp 2459877.861364262280
(2022-Oct-25.36136426)
9.1962e-05 TDB
period 2016.826347975392
5.52
1.3451e-05
3.683e-08
d
yr
n .178498263056405 1.1905e-09 deg/d
Q 3.514923601200951 1.5628e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3224  
   data-arc span      25728 days (70.44 yr)  
   first obs. used      1950-02-19  
   last obs. used      2020-07-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44004  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:43:27  

Additional Information
 Earth MOID = 1.72276 au 
 Jupiter MOID = 1.47467 au 
 T_jup = 3.203 
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Orbital Elements at Epoch 2456438.5 (2013-May-26.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1273871320369228 3.0908e-08  
q 2.72344084288753 9.6236e-08 au
tp 2455852.216924477253
(2011-Oct-17.71692448)
8.1869e-05 TDB
node 40.41096428445015 0.00021735 deg
peri 190.5592213746441 0.00021782 deg
i .9073531220056905 3.6038e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3224  
   data-arc span      25728 days (70.44 yr)  
   first obs. used      1950-02-19  
   last obs. used      2020-07-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44004  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:43:27  

Additional Information
 Jupiter MOID = 1.47467 au 
 T_jup = 3.203 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.553210921667811E-16 -2.951218944853423E-15 -2.90981050616368E-13 5.04868347274071E-16 -4.39241066223566E-14 7.302444435801794E-19
q -2.951218944853423E-15 9.261390045177716E-15 1.092108439627305E-12 -3.184764583153322E-15 1.759568120895301E-13 2.132815763642167E-17
tp -2.90981050616368E-13 1.092108439627305E-12 6.702584233715734E-9 -2.392920305788225E-12 1.184649537202302E-9 1.232958833983691E-13
node 5.04868347274071E-16 -3.184764583153322E-15 -2.392920305788225E-12 4.724025732204908E-8 -4.723459657602398E-8 -9.701684486464602E-11
peri -4.39241066223566E-14 1.759568120895301E-13 1.184649537202302E-9 -4.723459657602398E-8 4.744405045234776E-8 9.70278399155276E-11
i 7.302444435801794E-19 2.132815763642167E-17 1.232958833983691E-13 -9.701684486464602E-11 9.70278399155276E-11 1.298747663842388E-11

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 11.1   n/a MPO358646  
diameter diameter 30.365 km 0.351 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 23.88 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.]
[Fauerbach, M. (2019) Minor Planet Bull. 46, 15-19.]
geometric albedo albedo 0.092   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1939 Loretta (1974 UC)          Discovered 1974-Oct-17 by Kowal, C. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1974 UC = 1934 JE = 1934 LQ = 1939 EH = 1939 GP = 1950 DT = 1950 ES = 1951 MF = 1955 CA = 1969 TE5 = 1975 TZ5 = 1975 XW 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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