+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   19490 (1998 HC150) Classification: Main-belt Asteroid          SPK-ID: 2019490 [ 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 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1770268704371505 1.8201e-08   a 2.624407500229535 1.2058e-08 au q 2.159816853712115 5.1514e-08 au i 15.07082974769035 1.4486e-06 deg node 40.17829382956345 3.0026e-06 deg peri .9932608178195717 7.0752e-06 deg M 278.0282815514465 9.6792e-06 deg tp 2459554.095615452170 (2021-Dec-05.59561545) 4.3039e-05 TDB period 1552.906587442994 4.25 1.0702e-05 2.93e-08 d yr n .2318233452746012 1.5977e-09 deg/d Q 3.088998146746955 1.4193e-08 au   Orbit Determination Parameters    # obs. used (total)      1631      data-arc span      13457 days (36.84 yr)      first obs. used      1983-11-06      last obs. used      2020-09-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44891      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:55:00   Additional Information  Earth MOID = 1.16718 au   Jupiter MOID = 2.33804 au   T_jup = 3.333  [ 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 13.18   n/a E2021B10   diameter diameter 5.695 km 0.162 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.217   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   19490 (1998 HC150)          Discovered 1998-Apr-19 by Spacewatch at Kitt Peak Reference: 20001211/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1998 HC150 = 1983 VD2 = 1987 UJ1 = 2000 UK2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 18:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin