+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   190399 (1999 TQ144) Classification: Main-belt Asteroid          SPK-ID: 2190399 [ 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 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2064912252822828 4.931e-08   a 2.769330814552565 2.1345e-08 au q 2.197488301443624 1.3654e-07 au i 7.380217011179244 5.5857e-06 deg node 185.9066315381488 4.2123e-05 deg peri 108.8941687442398 4.4055e-05 deg M 267.7065812680796 1.6855e-05 deg tp 2459632.047809719973 (2022-Feb-21.54780972) 8.1487e-05 TDB period 1683.296746764226 4.61 1.9461e-05 5.328e-08 d yr n .2138660344303653 2.4726e-09 deg/d Q 3.341173327661506 2.5753e-08 au   Orbit Determination Parameters    # obs. used (total)      520      data-arc span      8343 days (22.84 yr)      first obs. used      1998-04-21      last obs. used      2021-02-22      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46871      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 22:07:29   Additional Information  Earth MOID = 1.19344 au   Jupiter MOID = 1.9383 au   T_jup = 3.295  [ 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 15.51   n/a E2021B55   diameter diameter 5.469 km 0.221 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.045   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   190399 (1999 TQ144)          Discovered 1999-Oct-07 by LINEAR at Socorro Reference: 20080917/Numbers.arc Last Updated: 2008-09-19 [ show close-approach data ] Alternate Designations  1999 TQ144 = 1998 HW66  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-14 21:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin