+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2353 Alva (1975 UD) Classification: Main-belt Asteroid          SPK-ID: 2002353 [ 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 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1135624073450272 4.1767e-08   a 2.803456946150901 1.1708e-08 au q 2.485089626457867 1.189e-07 au i 4.79666158388373 4.472e-06 deg node 24.63789981392717 4.4634e-05 deg peri 301.2712473330969 4.7473e-05 deg M 270.4417969043278 1.7818e-05 deg tp 2459627.022684186308 (2022-Feb-16.52268419) 8.5671e-05 TDB period 1714.50700214519 4.69 1.0741e-05 2.941e-08 d yr n .2099728957359569 1.3154e-09 deg/d Q 3.121824265843936 1.3038e-08 au   Orbit Determination Parameters    # obs. used (total)      2965      data-arc span      19790 days (54.18 yr)      first obs. used      1966-11-12      last obs. used      2021-01-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42863      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 19:05:18   Additional Information  Earth MOID = 1.47585 au   Jupiter MOID = 2.19784 au   T_jup = 3.309  [ 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 11.65   n/a E2021B10   diameter diameter 12.564 km 0.192 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 62.6 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: [Rowe, B. (2018) Minor Planet Bull. 45, 203-207.] geometric albedo albedo 0.213   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 2353 Alva (1975 UD)          Discovered 1975-Oct-27 by Wild, P. at Zimmerwald Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1975 UD = 1926 GA = 1966 VG = 1970 SG1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-27 23:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin