+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   27050 (1998 SW4) Classification: Main-belt Asteroid          SPK-ID: 2027050 [ 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 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1523224305183333 4.6136e-08   a 2.185442378419209 7.2836e-09 au q 1.852550483580628 1.0037e-07 au i 5.844681264866802 4.8764e-06 deg node 32.84252573571924 4.2277e-05 deg peri 354.5729332617417 4.4646e-05 deg M 303.9999513869863 1.6294e-05 deg tp 2459384.066475973226 (2021-Jun-18.56647597) 5.3808e-05 TDB period 1180.069178279325 3.23 5.8993e-06 1.615e-08 d yr n .3050668610165049 1.5251e-09 deg/d Q 2.51833427325779 8.393e-09 au   Orbit Determination Parameters    # obs. used (total)      1252      data-arc span      8504 days (23.28 yr)      first obs. used      1997-04-29      last obs. used      2020-08-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55826      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:25:30   Additional Information  Earth MOID = .85606 au   Jupiter MOID = 2.92536 au   T_jup = 3.655  [ 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 15.25   n/a E2021B10   diameter diameter 2.576 km 0.247 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.266   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   27050 (1998 SW4)          Discovered 1998-Sep-17 by LONEOS at Anderson Mesa Reference: 20010804/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-05 14:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin