+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21197 (1994 PS7) Classification: Main-belt Asteroid          SPK-ID: 2021197 [ 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 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0969016968456404 4.9539e-08   a 2.802284908591025 1.4355e-08 au q 2.530738745903625 1.3689e-07 au i 1.712169321848046 3.8384e-06 deg node 230.8634010349347 0.00014951 deg peri 143.0188823367367 0.0001508 deg M 185.1940103611666 2.1454e-05 deg tp 2460032.494906386458 (2023-Mar-28.99490639) 0.00010441 TDB period 1713.431941994431 4.69 1.3166e-05 3.605e-08 d yr n .2101046392195541 1.6144e-09 deg/d Q 3.073831071278426 1.5746e-08 au   Orbit Determination Parameters    # obs. used (total)      1173      data-arc span      10555 days (28.90 yr)      first obs. used      1992-03-02      last obs. used      2021-01-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50929      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 19:13:20   Additional Information  Earth MOID = 1.53009 au   Jupiter MOID = 2.3937 au   T_jup = 3.317  [ 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 14.89   n/a E2021B10   diameter diameter 3.955 km 0.248 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.163   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21197 (1994 PS7)          Discovered 1994-Aug-10 by Elst, E. W. at La Silla Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1994 PS7 = 1999 TQ30  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-11 05:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin