+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   180176 (2003 HP54) Classification: Main-belt Asteroid          SPK-ID: 2180176 [ 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 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1794047207290138 4.9575e-08   a 3.195331480270452 3.0554e-08 au q 2.622073928415905 1.7145e-07 au i 1.422872320946423 6.1969e-06 deg node 148.9702364115217 0.00024452 deg peri 126.8791907088403 0.00024544 deg M 349.7488203238876 2.2188e-05 deg tp 2459259.907824490144 (2021-Feb-14.40782449) 0.00012878 TDB period 2086.278603260441 5.71 2.9924e-05 8.193e-08 d yr n .1725560524070904 2.475e-09 deg/d Q 3.768589032125 3.6036e-08 au   Orbit Determination Parameters    # obs. used (total)      384      data-arc span      7934 days (21.72 yr)      first obs. used      1998-08-30      last obs. used      2020-05-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .59556      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 21:25:27   Additional Information  Earth MOID = 1.60415 au   Jupiter MOID = 1.36143 au   T_jup = 3.170  [ 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 15.43   n/a E2021B55   diameter diameter 4.500 km 0.609 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.066   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   180176 (2003 HP54)          Discovered 2003-Apr-24 by LONEOS at Anderson Mesa Reference: 20080321/Numbers.arc Last Updated: 2008-03-26 [ show close-approach data ] Alternate Designations  2003 HP54 = 2004 RU27  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 16:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin