+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   441434 (2008 HE4) Classification: Main-belt Asteroid          SPK-ID: 2441434 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 10 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1801902342877452 1.1138e-07   a 3.088003804598521 5.0637e-08 au q 2.531575675566465 3.1811e-07 au i 17.7084861019103 7.7535e-06 deg node 70.7122558738626 2.7296e-05 deg peri 110.6355677695234 3.4623e-05 deg M 99.24560319569557 2.0806e-05 deg tp 2458454.083328012917 (2018-Dec-01.58332801) 0.00011131 TDB period 1982.05256032825 5.43 4.8752e-05 1.335e-07 d yr n .1816298957987169 4.4675e-09 deg/d Q 3.644431933630577 5.9761e-08 au   Orbit Determination Parameters    # obs. used (total)      147      data-arc span      6757 days (18.50 yr)      first obs. used      2002-02-08      last obs. used      2020-08-09      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55606      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 08:55:59   Additional Information  Earth MOID = 1.59361 au   Jupiter MOID = 1.60046 au   T_jup = 3.129  [ hide covariance matrix ] Orbital Elements at Epoch 2457931.5 (2017-Jun-27.0) TDB Reference: JPL 10 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1784476509610426 1.1157e-07   q 2.534908557292711 3.1712e-07 au tp 2458452.512971002018 (2018-Nov-30.01297100) 0.00011287 TDB node 70.75070130641507 2.7242e-05 deg peri 110.3428684671895 3.4762e-05 deg i 17.73023145958779 7.7621e-06 deg   Orbit Determination Parameters    # obs. used (total)      147      data-arc span      6757 days (18.50 yr)      first obs. used      2002-02-08      last obs. used      2020-08-09      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55606      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 08:55:59   Additional Information  Jupiter MOID = 1.60046 au   T_jup = 3.129  Orbit Covariance (6×6)   e q tp node peri i e 1.244786929780417E-14 -3.521497307684741E-14 2.239202823260533E-12 -5.083237185413372E-14 -1.713849062505944E-13 -1.730394792846621E-15 q -3.521497307684741E-14 1.005627302527283E-13 -5.890705702421201E-12 1.586628946702533E-13 4.853717495768489E-13 1.050478744012512E-14 tp 2.239202823260533E-12 -5.890705702421201E-12 1.274032198434296E-8 -4.379372495251274E-11 2.444204938142304E-9 -5.372341514002484E-12 node -5.083237185413372E-14 1.586628946702533E-13 -4.379372495251274E-11 7.421415125044192E-10 -7.124594930319468E-10 -2.34199997224714E-11 peri -1.713849062505944E-13 4.853717495768489E-13 2.444204938142304E-9 -7.124594930319468E-10 1.208430592877632E-9 2.145167498904884E-11 i -1.730394792846621E-15 1.050478744012512E-14 -5.372341514002484E-12 -2.34199997224714E-11 2.145167498904884E-11 6.025073583792234E-11 [ 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 16.3   n/a MPO477081   441434 (2008 HE4)          Discovered 2008-Mar-30 by CSS at Catalina Reference: Last Updated: 2015-09-02 [ show close-approach data ] Alternate Designations  2008 HE4 = 2013 CX180  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-26 22:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin