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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 49 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1248911380634262 1.9698e-08  
a 3.124618054062654 1.2155e-08 au
q 2.734380949277241 6.6076e-08 au
i .9052876891939243 4.4286e-07 deg
node 40.47409829719058 3.0821e-05 deg
peri 189.5389766272986 2.9527e-05 deg
M 239.0917315695524 8.4696e-06 deg
tp 2459878.059336899153
(2022-Oct-25.55933690)
4.9311e-05 TDB
period 2017.408440713967
5.52
1.1772e-05
3.223e-08
d
yr
n .1784467600782888 1.0413e-09 deg/d
Q 3.514855158848067 1.3673e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3597  
   data-arc span      25962 days (71.08 yr)  
   first obs. used      1950-02-19  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42458  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:52:18  

Additional Information
 Earth MOID = 1.72277 au 
 Jupiter MOID = 1.47355 au 
 T_jup = 3.203 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456782.5 (2014-May-05.0) TDB
Reference: JPL 49 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1274790948529972 1.9464e-08  
q 2.722495577371021 6.5346e-08 au
tp 2455851.680929030858
(2011-Oct-17.18092903)
4.2816e-05 TDB
node 40.40998980526222 3.0855e-05 deg
peri 190.4352940894489 2.9625e-05 deg
i .9073881775110357 4.4155e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3597  
   data-arc span      25962 days (71.08 yr)  
   first obs. used      1950-02-19  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42458  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:52:18  

Additional Information
 Jupiter MOID = 1.47355 au 
 T_jup = 3.203 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.788658382735447E-16 -1.257326905393794E-15 -4.925871360452714E-13 1.072391104854293E-13 -1.665097774237978E-13 1.042414885454105E-15
q -1.257326905393794E-15 4.270159311069897E-15 1.552070644455608E-12 -3.333446897532313E-13 5.280135009527056E-13 -3.386681491725383E-15
tp -4.925871360452714E-13 1.552070644455608E-12 1.833224858325963E-9 2.410268291995142E-10 1.584652596206504E-11 -3.485465270843484E-13
node 1.072391104854293E-13 -3.333446897532313E-13 2.410268291995142E-10 9.520603634195246E-10 -8.958678586054061E-10 1.064203619846013E-11
peri -1.665097774237978E-13 5.280135009527056E-13 1.584652596206504E-11 -8.958678586054061E-10 8.776504111445407E-10 -1.059014985946137E-11
i 1.042414885454105E-15 -3.386681491725383E-15 -3.485465270843484E-13 1.064203619846013E-11 -1.059014985946137E-11 1.949642464977302E-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

[ show close-approach data ]
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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