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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1247354550588314 1.9702e-08  
a 3.124864013525562 1.2175e-08 au
q 2.735082678801485 6.6114e-08 au
i .9052828570594982 4.428e-07 deg
node 40.47313007810597 3.0816e-05 deg
peri 189.5192239476738 2.9519e-05 deg
M 274.0706108069374 8.5627e-06 deg
tp 2459878.097623097146
(2022-Oct-25.59762310)
4.9332e-05 TDB
period 2017.646650850043
5.52
1.1792e-05
3.228e-08
d
yr
n .1784256920548157 1.0428e-09 deg/d
Q 3.514645348249639 1.3694e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3677  
   data-arc span      26032 days (71.27 yr)  
   first obs. used      1950-02-19  
   last obs. used      2021-05-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42116  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:58:02  

Additional Information
 Earth MOID = 1.72519 au 
 Jupiter MOID = 1.47255 au 
 T_jup = 3.203 
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Orbital Elements at Epoch 2456809.5 (2014-Jun-01.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1274756547416681 1.9464e-08  
q 2.72250789971985 6.5335e-08 au
tp 2455851.634644456302
(2011-Oct-17.13464446)
4.2814e-05 TDB
node 40.40999320959457 3.0854e-05 deg
peri 190.4289828780333 2.9623e-05 deg
i .9073879389141125 4.4151e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3677  
   data-arc span      26032 days (71.27 yr)  
   first obs. used      1950-02-19  
   last obs. used      2021-05-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42116  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:58:02  

Additional Information
 Jupiter MOID = 1.47255 au 
 T_jup = 3.203 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.788419208753483E-16 -1.257105673353348E-15 -4.926421425648199E-13 1.07163856924442E-13 -1.664296576797508E-13 1.041941399723935E-15
q -1.257105673353348E-15 4.268615183090747E-15 1.552325774881262E-12 -3.32922525788064E-13 5.275646201582312E-13 -3.383981352501969E-15
tp -4.926421425648199E-13 1.552325774881262E-12 1.833065003758794E-9 2.409820956762305E-10 1.587038776655686E-11 -3.486046849093344E-13
node 1.07163856924442E-13 -3.32922525788064E-13 2.409820956762305E-10 9.519588516581945E-10 -8.957579070053276E-10 1.064045775629996E-11
peri -1.664296576797508E-13 5.275646201582312E-13 1.587038776655686E-11 -8.957579070053276E-10 8.775284402125738E-10 -1.058848671477409E-11
i 1.041941399723935E-15 -3.383981352501969E-15 -3.486046849093344E-13 1.064045775629996E-11 -1.058848671477409E-11 1.949346189057966E-13

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 11.19   n/a E2021B10  
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. 2020-October); 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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