+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21194 (1994 PN1) Classification: Main-belt Asteroid          SPK-ID: 2021194 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1962831066238789 1.8378e-08   a 2.790409123159902 1.4564e-08 au q 2.242698951714463 5.3731e-08 au i 24.70780439685343 3.6055e-07 deg node 108.7113992445958 1.8783e-06 deg peri 308.1487235476019 5.5502e-06 deg M 224.4636674759696 9.0958e-06 deg tp 2460037.493286244990 (2023-Apr-02.99328625) 4.6054e-05 TDB period 1702.551476426318 4.66 1.3329e-05 3.649e-08 d yr n .2114473512164493 1.6554e-09 deg/d Q 3.338119294605341 1.7423e-08 au   Orbit Determination Parameters    # obs. used (total)      1870      data-arc span      9822 days (26.89 yr)      first obs. used      1994-08-09      last obs. used      2021-06-30      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42189      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 18:31:19   Additional Information  Earth MOID = 1.32287 au   Jupiter MOID = 2.08597 au   T_jup = 3.169  [ 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 13.13   n/a E2021B10   diameter diameter 13.905 km 0.065 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.069   0.002 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21194 (1994 PN1)          Discovered 1994-Aug-11 by McNaught, R. H. at Siding Spring Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1994 PN1 = 1998 MN28  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Aug-01 05:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin