+ 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 | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1964303630730856 1.8424e-08   a 2.78987419714795 1.4783e-08 au q 2.241858195673945 5.3748e-08 au i 24.70916919404073 3.6064e-07 deg node 108.7093962746619 1.8799e-06 deg peri 308.2147610989419 5.5559e-06 deg M 182.9287213234048 8.962e-06 deg tp 2460037.684116122002 (2023-Apr-03.18411612) 4.6382e-05 TDB period 1702.061927018529 4.66 1.3528e-05 3.704e-08 d yr n .2115081679963345 1.6811e-09 deg/d Q 3.337890198621956 1.7687e-08 au   Orbit Determination Parameters    # obs. used (total)      1779      data-arc span      9677 days (26.49 yr)      first obs. used      1994-08-09      last obs. used      2021-02-05      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42079      source      ORB      producer      Otto Matic      solution date      2021-Mar-17 02:55:12   Additional Information  Earth MOID = 1.32162 au   Jupiter MOID = 2.08523 au   T_jup = 3.170  [ 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 13.13   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 [ show close-approach data ] Alternate Designations  1994 PN1 = 1998 MN28  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-10 20:05 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin