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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1255591550591544 3.1144e-08  
a 3.122742713670217 1.3893e-08 au
q 2.730653777074654 9.6949e-08 au
i .9056583214932468 3.5958e-06 deg
node 40.47830874449963 0.00022189 deg
peri 189.4699995351788 0.00022236 deg
M 132.0666817373208 1.5754e-05 deg
tp 2457861.076076598280
(2017-Apr-17.57607660)
8.6353e-05 TDB
period 2015.592494055945
5.52
1.3451e-05
3.683e-08
d
yr
n .1786075315628794 1.1919e-09 deg/d
Q 3.51483165026578 1.5637e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3066  
   data-arc span      25484 days (69.77 yr)  
   first obs. used      1950-02-19  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44984  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:28:44  

Additional Information
 Earth MOID = 1.72034 au 
 Jupiter MOID = 1.4752 au 
 T_jup = 3.203 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456366.5 (2013-Mar-15.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1273779480480164 3.079e-08  
q 2.723699082214137 9.5948e-08 au
tp 2455852.372473585804
(2011-Oct-17.87247359)
8.2576e-05 TDB
node 40.41402944906779 0.00022169 deg
peri 190.594457313135 0.00022216 deg
i .9073165306801542 3.5939e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3066  
   data-arc span      25484 days (69.77 yr)  
   first obs. used      1950-02-19  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44984  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:28:44  

Additional Information
 Jupiter MOID = 1.4752 au 
 T_jup = 3.203 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.480150684508035E-16 -2.930760676606808E-15 -2.876756365648422E-13 1.01646370755978E-15 -4.337478429626263E-14 -1.724667061228811E-18
q -2.930760676606808E-15 9.205924057686794E-15 1.067508894982457E-12 -4.720417144228686E-15 1.713055964716226E-13 2.795921354715749E-17
tp -2.876756365648422E-13 1.067508894982457E-12 6.818845269048142E-9 -3.02790139439882E-12 1.208995459376695E-9 1.339059992830586E-13
node 1.01646370755978E-15 -4.720417144228686E-15 -3.02790139439882E-12 4.914818083888005E-8 -4.91423933069848E-8 -1.054325095288273E-10
peri -4.337478429626263E-14 1.713055964716226E-13 1.208995459376695E-9 -4.91423933069848E-8 4.935654213422984E-8 1.054442181770553E-10
i -1.724667061228811E-18 2.795921354715749E-17 1.339059992830586E-13 -1.054325095288273E-10 1.054442181770553E-10 1.291622282327064E-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-January); 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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