+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2601 Bologna (1980 XA) Classification: Main-belt Asteroid          SPK-ID: 2002601 [ 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 45 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06465476691329029 1.9851e-08   a 3.128075310280074 1.5844e-08 au q 2.925830330206697 5.9613e-08 au i 9.586685125880015 9.2377e-07 deg node 288.15797013 4.2099e-06 deg peri 193.1517753804839 1.5876e-05 deg M 32.08229583356348 1.4034e-05 deg tp 2459020.415155212276 (2020-Jun-19.91515521) 7.85e-05 TDB period 2020.757630934788 5.53 1.5353e-05 4.203e-08 d yr n .1781510036082193 1.3535e-09 deg/d Q 3.33032029035345 1.6869e-08 au   Orbit Determination Parameters    # obs. used (total)      2730      data-arc span      20525 days (56.19 yr)      first obs. used      1965-01-11      last obs. used      2021-03-23      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .39706      source      ORB      producer      Otto Matic      solution date      2021-May-03 20:22:31   Additional Information  Earth MOID = 1.9427 au   Jupiter MOID = 1.77696 au   T_jup = 3.189  [ 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 11.46   n/a E2021B10   diameter diameter 12.172 km 0.165 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   geometric albedo albedo 0.360   0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   2601 Bologna (1980 XA)          Discovered 1980-Dec-08 by Osservatorio San Vittore at Bologna Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1980 XA = 1965 AC1 = 1971 DD1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-May-11 14:53 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin