+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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 2459000.5 (2020-May-31.0) TDB Reference: JPL 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .125129470875672 3.1133e-08   a 3.124016981906425 1.3888e-08 au q 2.73311038995386 9.6955e-08 au i .9053592593349533 3.5919e-06 deg node 40.47811647323383 0.00021859 deg peri 189.5530060631995 0.00021907 deg M 203.3925207207695 1.5948e-05 deg tp 2459877.861361511850 (2022-Oct-25.36136151) 9.2033e-05 TDB period 2016.826345701577 5.52 1.3449e-05 3.682e-08 d yr n .1784982632576479 1.1903e-09 deg/d Q 3.51492357385899 1.5626e-08 au   Orbit Determination Parameters    # obs. used (total)      3178      data-arc span      25553 days (69.96 yr)      first obs. used      1950-02-19      last obs. used      2020-02-05      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44226      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 16:08:25   Additional Information  Earth MOID = 1.72276 au   Jupiter MOID = 1.47467 au   T_jup = 3.203  [ show covariance matrix ] [ 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.DB Last 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 ] 2020-Aug-11 13:31 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin