+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3097 Tacitus (2011 P-L) Classification: Main-belt Asteroid          SPK-ID: 2003097 [ 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 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09023450087822731 2.469e-08   a 2.928688738067564 1.0906e-08 au q 2.664419971560352 7.2116e-08 au i 7.46172269825702 3.409e-06 deg node 196.6662198936353 2.2086e-05 deg peri 86.72257530335229 3.1041e-05 deg M 39.38983146922454 2.0393e-05 deg tp 2458800.195883560862 (2019-Nov-12.69588356) 0.00010372 TDB period 1830.66236204715 5.01 1.0226e-05 2.8e-08 d yr n .1966501346525897 1.0985e-09 deg/d Q 3.192957504574776 1.189e-08 au   Orbit Determination Parameters    # obs. used (total)      2928      data-arc span      24671 days (67.55 yr)      first obs. used      1953-04-15      last obs. used      2020-10-31      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45601      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:03:14   Additional Information  Earth MOID = 1.66175 au   Jupiter MOID = 1.9394 au   T_jup = 3.258  [ 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 12.3   n/a MPO435727   diameter diameter 20.810 km 0.170 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 7.417 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.054   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   3097 Tacitus (2011 P-L)          Discovered 1960-Sep-24 by PLS at Palomar These planets have all been discovered as a result of the Palomar survey of faint minor planets and subsequently identified with planets observed at other oppositions. In Sept. and Oct. 1960, T. Gehrels exposed 130 plates with the 122 cm Schmidt camera at Palomar. In the following years C. J. van Houten and I. van Houten-Groeneveld measured these plates astrometrically and photometrically at Leiden. P. Herget, Cincinnati, computed the orbits of the planets found on the NORC computer, Dahlgren, Virginia, USA. Note: "planet" implies "minor planet" Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  2011 P-L = 1965 SX = 1975 TL = 1979 MH9 = 1980 RW2 = 1980 TR6  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Nov-30 17:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin