+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1661131292690156 3.0958e-08   a 2.283263182075404 6.0724e-09 au q 1.903983189956129 7.0518e-08 au i 5.428324388797429 4.1652e-06 deg node 167.7503714241228 3.2131e-05 deg peri 248.5673202421935 3.4364e-05 deg M 175.1394209925996 1.253e-05 deg tp 2458587.424732645105 (2019-Apr-13.92473265) 4.2873e-05 TDB period 1260.179433030603 3.45 5.0272e-06 1.376e-08 d yr n .2856736037456481 1.1396e-09 deg/d Q 2.66254317419468 7.0811e-09 au   Orbit Determination Parameters    # obs. used (total)      1890      data-arc span      11943 days (32.70 yr)      first obs. used      1987-09-13      last obs. used      2020-05-25      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .52453      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 00:52:22   Additional Information  Earth MOID = .922574 au   Jupiter MOID = 2.69047 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 14.61   n/a E2021B10   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 ] 2021-Apr-16 09:29 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin