+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 42 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1134157994322108 4.1792e-08   a 2.803872230929967 1.176e-08 au q 2.485868820353268 1.1894e-07 au i 4.796266937126056 4.4739e-06 deg node 24.63836753481592 4.4676e-05 deg peri 301.2152048833041 4.7521e-05 deg M 228.4984533947703 1.7775e-05 deg tp 2459626.917837524610 (2022-Feb-16.41783752) 8.5847e-05 TDB period 1714.887979118957 4.70 1.0789e-05 2.954e-08 d yr n .2099262484684008 1.3207e-09 deg/d Q 3.121875641506665 1.3094e-08 au   Orbit Determination Parameters    # obs. used (total)      2958      data-arc span      19625 days (53.73 yr)      first obs. used      1966-11-12      last obs. used      2020-08-05      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42879      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 22:49:50   Additional Information  Earth MOID = 1.47856 au   Jupiter MOID = 2.19788 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 11.6   n/a MPO492778   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. 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: [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 ] 2020-Nov-25 17:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin