+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100731 Ara Pacis (1998 DO) Classification: Main-belt Asteroid          SPK-ID: 2100731 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1587142172206237 3.2863e-08   a 2.775370216447292 1.2627e-08 au q 2.334879505046427 9.3577e-08 au i 12.91716852268429 5.0302e-06 deg node 160.6081784178678 1.5217e-05 deg peri 254.6551153335334 2.1994e-05 deg M 54.07649195066357 1.4928e-05 deg tp 2458946.820238037149 (2020-Apr-07.32023804) 6.9958e-05 TDB period 1688.806189387174 4.62 1.1525e-05 3.155e-08 d yr n .2131683329101458 1.4548e-09 deg/d Q 3.215860927848157 1.4631e-08 au   Orbit Determination Parameters    # obs. used (total)      1023      data-arc span      8370 days (22.92 yr)      first obs. used      1998-02-18      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52632      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:26:03   Additional Information  Earth MOID = 1.38321 au   Jupiter MOID = 2.28813 au   T_jup = 3.280  [ 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 14.67   n/a E2021B55   diameter diameter 3.924 km 0.085 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.182   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   100731 Ara Pacis           Discovered 1998 Feb. 18 by V. S. Casulli at Colleverde. Ara Pacis Augustae, located in Rome, is an altar dedicated to Pax, the Roman goddess of peace. The monument was commissioned by the Roman Senate in 13 BCE to honor the return of Augustus to Rome after a three-year expedition in Hispania and Gaul. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2017-11-04 Last Updated: 2017-11-07 [ show close-approach data ] Alternate Designations  1998 DO = 2001 VN94  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-08 13:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin