+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   5599 (1991 SG1) Classification: Main-belt Asteroid          SPK-ID: 2005599 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1321265932190412 5.9619e-08   a 2.420780141926123 1.753e-08 AU q 2.100930708841117 1.448e-07 AU i 6.450091545081975 7.1344e-06 deg node 265.7851794649482 7.5774e-05 deg peri 196.8267787519052 8.5191e-05 deg M 194.5090030386575 3.7471e-05 deg tp 2457032.916686688040 (2015-Jan-10.41668669) 0.00014426 JED period 1375.72442844656 3.77 1.4943e-05 4.091e-08 d yr n .2616803136995283 2.8424e-09 deg/d Q 2.740629575011129 1.9846e-08 AU   Orbit Determination Parameters    # obs. used (total)      936      data-arc span      22736 days (62.25 yr)      first obs. used      1951-01-06      last obs. used      2013-04-06      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .5693      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:17:36   Additional Information  Earth MOID = 1.11809 AU   T_jup = 3.493  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.5 mag n/a PDS3 (MPC 28113)   rotation period rot_per 3.62 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Willis, S. (2004) Minor Planet Bul. 31, 82-83.] 5599 (1991 SG1)          Discovered 1991-Sep-29 by Ueda and Kaneda at Kushiro (399) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1991 SG1 = 1951 AK1 = 1972 RE1 = 1987 SY20 = 1989 CE1  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-21 02:36 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin