+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15230 Alona (1987 RF1) Classification: Main-belt Asteroid          SPK-ID: 2015230 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1660730161343969 3.0992e-08   a 2.283459234853172 6.1032e-09 au q 1.904238272501164 7.061e-08 au i 5.428144443452307 4.1682e-06 deg node 167.7495556041783 3.2295e-05 deg peri 248.6094095294629 3.4525e-05 deg M 117.9564304571024 1.2439e-05 deg tp 2458587.540518411284 (2019-Apr-14.04051841) 4.2905e-05 TDB period 1260.341744793671 3.45 5.053e-06 1.383e-08 d yr n .2856368135762536 1.1452e-09 deg/d Q 2.662680197205181 7.1168e-09 au   Orbit Determination Parameters    # obs. used (total)      1855      data-arc span      11916 days (32.62 yr)      first obs. used      1987-09-13      last obs. used      2020-04-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .527      source      ORB      producer      Otto Matic      solution date      2020-May-20 04:08:59   Additional Information  Earth MOID = .923613 au   Jupiter MOID = 2.68963 au   T_jup = 3.579  [ 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 14.6   n/a MPO452385   diameter diameter 3.429 km 0.342 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.314   0.050 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15230 Alona           Discovered 1987 Sept. 13 by H. Debehogne at the European Southern Observatory. Alona (b. 1997) is a daughter of Valentina Arkadievna Andreichenko, who performed the reductions for astrometric measurements by the discoverer and served as translator for the Tomsk-Uccle Observational Program. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20020328/MPCPages.arc Last Updated: 2003-10-02 Alternate Designations  1987 RF1 = 1998 YS27  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Oct-28 01:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin