+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100449 (1996 RJ9) Classification: Main-belt Asteroid          SPK-ID: 2100449 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1988578925864905 4.3186e-08   a 2.744090568075246 1.196e-08 au q 2.198406500641337 1.1497e-07 au i 8.166943649596638 4.6899e-06 deg node 346.9998253956567 2.5582e-05 deg peri 9.218776284460832 2.7418e-05 deg M 114.896004304092 9.6706e-06 deg tp 2458670.594394854329 (2019-Jul-06.09439485) 4.368e-05 TDB period 1660.336397317582 4.55 1.0854e-05 2.972e-08 d yr n .216823530810751 1.4175e-09 deg/d Q 3.289774635509155 1.4338e-08 au   Orbit Determination Parameters    # obs. used (total)      794      data-arc span      12226 days (33.47 yr)      first obs. used      1987-09-24      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .48343      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:32:13   Additional Information  Earth MOID = 1.19259 au   Jupiter MOID = 2.15738 au   T_jup = 3.305  [ hide covariance matrix ] Orbital Elements at Epoch 2457257.5 (2015-Aug-23.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2012376391062621 4.3827e-08   q 2.18964986481167 1.1719e-07 au tp 2457006.977609792780 (2014-Dec-15.47760979) 4.0703e-05 TDB node 347.1810166882112 2.5472e-05 deg peri 8.301836250301559 2.7231e-05 deg i 8.193230530304955 4.7005e-06 deg   Orbit Determination Parameters    # obs. used (total)      794      data-arc span      12226 days (33.47 yr)      first obs. used      1987-09-24      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .48343      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:32:13   Additional Information  Jupiter MOID = 2.15738 au   T_jup = 3.305  Orbit Covariance (6×6)   e q tp node peri i e 1.920840443333438E-15 -5.122095985217077E-15 -3.911406228590953E-13 8.841619489500369E-15 -1.3787997632546E-13 -5.30684592046597E-15 q -5.122095985217077E-15 1.373408094999701E-14 1.082323543473487E-12 -2.45783105114517E-14 3.798716696725337E-13 1.448196221993095E-14 tp -3.911406228590953E-13 1.082323543473487E-12 1.656733102044621E-9 8.444261276950271E-12 4.026944391883638E-10 -3.51052486168465E-13 node 8.841619489500369E-15 -2.45783105114517E-14 8.444261276950271E-12 6.488329949538187E-10 -6.396299790360763E-10 -1.747956168431564E-11 peri -1.3787997632546E-13 3.798716696725337E-13 4.026944391883638E-10 -6.396299790360763E-10 7.415052033328566E-10 1.727924848793243E-11 i -5.30684592046597E-15 1.448196221993095E-14 -3.51052486168465E-13 -1.747956168431564E-11 1.727924848793243E-11 2.209430397168006E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.28   n/a E2021B55   diameter diameter 6.026 km 0.531 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.043   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   100449 (1996 RJ9)          Discovered 1996-Sep-07 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 Alternate Designations  1996 RJ9 = 2001 SD261  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-18 15:49 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin