+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06471142830868308 3.748e-08   a 3.128367381279808 1.7325e-08 au q 2.925926259762897 1.1968e-07 au i 9.587028792237053 4.0776e-06 deg node 288.1592178378722 2.4174e-05 deg peri 193.2839519661669 3.9287e-05 deg M 356.335589852706 3.0478e-05 deg tp 2459021.072005257290 (2020-Jun-20.57200526) 0.00017112 TDB period 2021.040657278324 5.53 1.6789e-05 4.597e-08 d yr n .1781260553584317 1.4797e-09 deg/d Q 3.330808502796719 1.8446e-08 au   Orbit Determination Parameters    # obs. used (total)      2445      data-arc span      20387 days (55.82 yr)      first obs. used      1965-01-11      last obs. used      2020-11-05      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41237      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:07:20   Additional Information  Earth MOID = 1.9429 au   Jupiter MOID = 1.77675 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 11.4   n/a MPO324330   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-Jan-22 07:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin