+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   11667 Testa (1997 UB1) Classification: Main-belt Asteroid          SPK-ID: 2011667 [ 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 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1559221609729911 3.865e-08   a 2.318891519249911 8.1433e-09 au q 1.957324942506523 8.9131e-08 au i 4.75388651386933 4.1957e-06 deg node 32.10134826741347 4.8944e-05 deg peri 261.8799069887664 5.2401e-05 deg M 280.4525084433079 2.1307e-05 deg tp 2459485.498821186054 (2021-Sep-27.99882119) 7.6768e-05 TDB period 1289.790207323616 3.53 6.7941e-06 1.86e-08 d yr n .279115159935211 1.4703e-09 deg/d Q 2.680458095993299 9.4131e-09 au   Orbit Determination Parameters    # obs. used (total)      1413      data-arc span      14035 days (38.43 yr)      first obs. used      1982-07-09      last obs. used      2020-12-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50805      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:01:50   Additional Information  Earth MOID = .946363 au   Jupiter MOID = 2.5081 au   T_jup = 3.558  [ 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 14.9   n/a MPO458941   diameter diameter 2.503 km 0.384 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.407   0.108 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   11667 Testa           Discovered 1997 Oct. 19 by L. Tesi and A. Boattini at San Marcello Pistoiese. Augusto Testa (b. 1950), Italian amateur astronomer, observes minor planets at the Sormano Astronomical Observatory. Over the past few years he has developed a lot of software dedicated to the observation of minor planets, and these are widely used by the Italian community of astrometric observers. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20000124/MPCPages.arc Last Updated: 2013-03-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-03 00:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin