+ 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 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1400878069492676 1.9958e-05   a 46.30983004629665 0.0013362 au q 39.82238751491765 0.00024051 au i 9.842127848413446 5.2523e-05 deg node 334.9388534210384 0.00012842 deg peri 177.7639495707785 0.0025924 deg M 23.51143466254331 0.0026371 deg tp 2451482.802657180708 (1999-Oct-31.30265718) 0.61327 TDB period 115108.7154935099 315.15 4.9821 0.01364 d yr n .003127478214456295 1.3536e-07 deg/d Q 52.79727257767563 0.0015234 au   Orbit Determination Parameters    # obs. used (total)      225      data-arc span      7757 days (21.24 yr)      first obs. used      1999-02-20      last obs. used      2020-05-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      2      norm. resid. RMS      .48241      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 21:21:17   Additional Information  Earth MOID = 38.8331 au   Jupiter MOID = 34.4201 au   T_jup = 5.933  [ hide covariance matrix ] Orbital Elements at Epoch 2457399.5 (2016-Jan-12.0) TDB Reference: JPL 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1489853008928052 2.0078e-05   q 39.80002450965754 0.00023976 au tp 2451548.819706132552 (2000-Jan-05.31970613) 0.572 TDB node 334.8105556505012 0.00012914 deg peri 178.0411054252126 0.0024308 deg i 9.797224399127407 5.2296e-05 deg   Orbit Determination Parameters    # obs. used (total)      225      data-arc span      7757 days (21.24 yr)      first obs. used      1999-02-20      last obs. used      2020-05-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      2      norm. resid. RMS      .48241      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 21:21:17   Additional Information  Jupiter MOID = 34.4201 au   T_jup = 5.933  Orbit Covariance (6×6)   e q tp node peri i e 4.031320680981165E-10 4.427343440635802E-9 5.732435556135785E-6 6.325768235137038E-11 2.378324715608757E-8 4.025053166743035E-11 q 4.427343440635802E-9 5.748318126469729E-8 .0001076699946008891 5.946694636625063E-10 4.529837529025745E-7 4.037651566946358E-10 tp 5.732435556135785E-6 .0001076699946008891 .3271834236934436 3.132264171093286E-7 .001388349430368861 3.359004700552139E-7 node 6.325768235137038E-11 5.946694636625063E-10 3.132264171093286E-7 1.667630770565136E-8 -1.519010007048724E-8 6.586371897098428E-9 peri 2.378324715608757E-8 4.529837529025745E-7 .001388349430368861 -1.519010007048724E-8 5.908987098578288E-6 -5.115350996472776E-9 i 4.025053166743035E-11 4.037651566946358E-10 3.359004700552139E-7 6.586371897098428E-9 -5.115350996472776E-9 2.734841873505823E-9 [ 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. 2020-October); 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 ] 2021-Jan-22 14:29 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin