+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   79983 (1999 DF9) Classification: TransNeptunian Object          SPK-ID: 2079983 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 11 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1400765872835923 3.462e-05   a 46.30920303136679 0.0023626 au q 39.82236791090995 0.00044852 au i 9.84218746058921 0.00010624 deg node 334.9389601880803 0.00020951 deg peri 177.7680182329979 0.0066231 deg M 23.50880160513824 0.0061696 deg tp 2451483.797229797476 (1999-Nov-01.29722980) 1.5771 TDB period 115106.37771861 315.14 8.8089 0.02412 d yr n .003127541732570708 2.3935e-07 deg/d Q 52.79603815182364 0.0026936 au   Orbit Determination Parameters    # obs. used (total)      113      data-arc span      6534 days (17.89 yr)      first obs. used      1999-02-20      last obs. used      2017-01-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      2      norm. resid. RMS      .47907      source      ORB      producer      Otto Matic      solution date      2020-Feb-23 18:50:10   Additional Information  Earth MOID = 38.8331 au   Jupiter MOID = 34.42 au   T_jup = 5.933  [ hide covariance matrix ] Orbital Elements at Epoch 2456387.5 (2013-Apr-05.0) TDB Reference: JPL 11 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1449845740585406 3.4491e-05   q 39.74992949394631 0.00045989 au tp 2451146.028505317064 (1998-Nov-28.52850532) 1.5574 TDB node 334.8339784636715 0.00021064 deg peri 176.3497689060635 0.0065791 deg i 9.8087789246259 0.000106 deg   Orbit Determination Parameters    # obs. used (total)      113      data-arc span      6534 days (17.89 yr)      first obs. used      1999-02-20      last obs. used      2017-01-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      2      norm. resid. RMS      .47907      source      ORB      producer      Otto Matic      solution date      2020-Feb-23 18:50:10   Additional Information  Jupiter MOID = 34.42 au   T_jup = 5.933  Orbit Covariance (6×6)   e q tp node peri i e 1.18965033123113E-9 1.480954753693755E-8 3.014629420772575E-5 -3.739445133052086E-10 1.267608471891461E-7 -1.498801631736597E-10 q 1.480954753693755E-8 2.114974827438355E-7 .0005778276292698074 -5.146074315740561E-9 2.436915509780295E-6 -2.110047545160495E-9 tp 3.014629420772575E-5 .0005778276292698074 2.425342419980108 -1.298496492311997E-5 .01024062626322012 -5.596900985682254E-6 node -3.739445133052086E-10 -5.146074315740561E-9 -1.298496492311997E-5 4.43700930234501E-8 -9.833950268826104E-8 2.171677670298967E-8 peri 1.267608471891461E-7 2.436915509780295E-6 .01024062626322012 -9.833950268826104E-8 4.328453390434645E-5 -4.49496308405943E-8 i -1.498801631736597E-10 -2.110047545160495E-9 -5.596900985682254E-6 2.171677670298967E-8 -4.49496308405943E-8 1.123703784882983E-8 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 5.8   n/a MPO453222   rotation period rot_per 6.65 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: [Lacerda, P.; Luu, J. (2006) Astron. J. 131, 2314-2326.] 79983 (1999 DF9)          Discovered 1999-Feb-20 by Luu, J. X., Trujillo, C. A., Jewitt, D. C. at Kitt Peak Reference: 20040504/Numbers.arc Last Updated: 2004-07-16 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2020-Aug-05 11:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin