+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   4584 Akan (1990 FA) Classification: Main-belt Asteroid          SPK-ID: 2004584 [ 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 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .199995048254878 3.1371e-08   a 2.790816217482794 1.2579e-08 au q 2.232666793396827 8.9077e-08 au i 7.668675690915145 4.2388e-06 deg node 25.17738828297034 3.1427e-05 deg peri 66.07869165373653 3.3762e-05 deg M 272.9129457316097 1.3934e-05 deg tp 2459612.451780099232 (2022-Feb-01.95178010) 6.7302e-05 TDB period 1702.924069272974 4.66 1.1513e-05 3.152e-08 d yr n .2114010873976865 1.4292e-09 deg/d Q 3.348965641568762 1.5094e-08 au   Orbit Determination Parameters    # obs. used (total)      1855      data-arc span      18240 days (49.94 yr)      first obs. used      1971-01-25      last obs. used      2021-01-02      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47728      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 16:31:57   Additional Information  Earth MOID = 1.26176 au   Jupiter MOID = 1.93126 au   T_jup = 3.287  [ 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 13.18   n/a E2021B10   diameter diameter 14.551 km 0.216 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.091   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   SMASSII spectral type spec_B C   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) 4584 Akan (1990 FA)          Discovered 1990-Mar-16 by Matsuyama and Watanabe at Kushiro Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1990 FA = 1951 WA1 = 1971 BR = 1979 VB2 = 1979 YG1 = 1985 BK2 = 1988 UR1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-17 22:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin