+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1375 Alfreda (1935 UB) Classification: Main-belt Asteroid          SPK-ID: 2001375 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 49 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07127209294748718 1.4154e-08   a 2.447256264673955 6.3951e-09 au q 2.272835188711792 3.5819e-08 au i 5.8194907574125 8.658e-07 deg node 52.75254176659403 4.6736e-06 deg peri 32.58921825209521 1.1616e-05 deg M 98.06061665317246 1.1903e-05 deg tp 2459015.601099124490 (2020-Jun-15.10109912) 4.6148e-05 TDB period 1398.355517181498 3.83 5.4812e-06 1.501e-08 d yr n .2574452602193824 1.0091e-09 deg/d Q 2.621677340636117 6.8509e-09 au   Orbit Determination Parameters    # obs. used (total)      3315      data-arc span      32758 days (89.69 yr)      first obs. used      1931-10-12      last obs. used      2021-06-19      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .38811      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:18:17   Additional Information  Earth MOID = 1.29103 au   Jupiter MOID = 2.51907 au   T_jup = 3.487  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.53   n/a MPCxxxxx   diameter diameter 13.928 km 0.174 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 19.14 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pligge, Z.; Monnier, A.; Pharo, J.; Stolze, K.; Yim, A.; Ditteon, R. (2011) Minor Planet Bull. 38, 5-7.] geometric albedo albedo 0.204   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1375 Alfreda (1935 UB)          Discovered 1935-Oct-22 by Delporte, E. at Uccle Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1935 UB = 1931 TV3 = 1933 FC = A916 WK  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-28 05:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin