+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 10 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1812430848470319 1.1143e-07   a 3.084850032921706 5.0411e-08 au q 2.525742296664508 3.1818e-07 au i 17.6970692992394 7.752e-06 deg node 70.63565297189967 2.7337e-05 deg peri 110.4819114182946 3.4589e-05 deg M 135.7761505426054 2.0991e-05 deg tp 2458454.101940223022 (2018-Dec-01.60194022) 0.00011043 TDB period 1979.016936670297 5.42 4.851e-05 1.328e-07 d yr n .1819084987750036 4.4589e-09 deg/d Q 3.643957769178904 5.9547e-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 = 1.58745 au   Jupiter MOID = 1.60109 au   T_jup = 3.130  [ 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 16.41   n/a E2021B25   441434 (2008 HE4)          Discovered 2008-Mar-30 by CSS at Catalina Reference: Last Updated: 2015-09-02 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 1941-Jun-20 12:42 00:05 Jupiter 1.80194159470682 1.80193761996997 1.80194556960295 4.84273803878561 4.74468014297919 2430166.029051234 4.93941490087494 887.436820446206 27.6723684149268 -77.7586411612562 1768989.78961661 T 10 CATAB v2.0f-lin.ifort 2020-Nov-12 08:56:00 2020-Nov-12 08:56 1951-Jan-15 11:12 00:09 Jupiter 1.83201340191083 1.83201107474432 1.83201574631188 0.821368088605357 n/a 2433661.966829609 8.62226113253222 10908.0187412223 67.9222912171803 89.5029826238021 4033775.77629052 F 10 CATAB v2.0f-lin.ifort 2020-Nov-12 08:56:00 2020-Nov-12 08:56 2001-Mar-03 04:23 00:01 Jupiter 1.96638125508826 1.9663798639339 1.96638264625056 5.17625062681208 5.09235374817901 2451971.682517244 1.05456462283634 237.298166830505 30.0563994528382 -75.1802442547766 2043188.18159041 T 10 CATAB v2.0f-lin.ifort 2020-Nov-12 08:56:00 2020-Nov-12 08:56 2011-Jan-10 19:24 < 00:01 Jupiter 1.71043237251803 1.71043105217752 1.7104336928599 2.79595766339266 2.6128452065272 2455572.308269834 0.945533156606131 269.093421440045 58.7055712594636 -77.0227011972403 876433.828145625 T 10 CATAB v2.0f-lin.ifort 2020-Nov-12 08:56:00 2020-Nov-12 08:56 2070-Oct-13 07:50 00:04 Jupiter 1.61803968569785 1.61803764501889 1.6180417263873 3.6550633708099 3.50891928133448 2477397.826334003 4.23492474416923 304.965401835923 80.7645543719342 72.4478765397512 1015042.71334508 T 10 CATAB v2.0f-lin.ifort 2020-Nov-12 08:56:00 2020-Nov-12 08:56 2130-Jun-17 01:41 00:08 Jupiter 1.58235974784071 1.58235878774163 1.58236070794519 4.12193421307428 3.98995741614797 2499193.570158338 8.23532517180493 919.736858382822 46.7646047425656 88.3249056024874 1383894.47766585 T 10 CATAB v2.0f-lin.ifort 2020-Nov-12 08:56:00 2020-Nov-12 08:56 2190-Feb-16 22:58 00:13 Jupiter 1.6158341537919 1.61582880512949 1.61583950335141 4.46206850658673 4.34300041095714 2520988.456637107 13.1448315842528 1958.99533334526 30.2773793394811 -82.8163186307864 1608899.34333573 T 10 CATAB v2.0f-lin.ifort 2020-Nov-12 08:56:00 2020-Nov-12 08:56 2199-Jun-21 13:48 00:22 Jupiter 1.98984482657879 1.98983708889412 1.98985256394314 1.79706255526007 1.54210522732752 2524400.075268627 22.3927796536975 2765.41361507045 84.8244039716231 8.82208490592266 151199.588073491 T 10 CATAB v2.0f-lin.ifort 2020-Nov-12 08:56:00 2020-Nov-12 08:56 Alternate Designations  2008 HE4 = 2013 CX180  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-11 11:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin