+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   58241 (1993 HH4) Classification: Main-belt Asteroid          SPK-ID: 2058241 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07914777685815839 4.782e-08   a 2.700394624558044 1.638e-08 au q 2.486664393384554 1.3019e-07 au i 27.68794675254212 8.587e-06 deg node 30.01636954878891 1.0912e-05 deg peri 257.8583539898801 5.5374e-05 deg M 320.0881069851278 5.6075e-05 deg tp 2459180.196287650524 (2020-Nov-26.69628765) 0.00025256 TDB period 1620.836764873148 4.44 1.4747e-05 4.038e-08 d yr n .2221074989178042 2.0209e-09 deg/d Q 2.914124855731534 1.7676e-08 au   Orbit Determination Parameters    # obs. used (total)      418      data-arc span      9896 days (27.09 yr)      first obs. used      1993-04-20      last obs. used      2020-05-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .59928      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 22:51:48   Additional Information  Earth MOID = 1.58174 au   Jupiter MOID = 2.23405 au   T_jup = 3.199  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.3   n/a MPO244663   diameter diameter 4.842 km 0.176 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.069   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   58241 (1993 HH4)          Discovered 1993-Apr-21 by Spacewatch at Kitt Peak Reference: 20030614/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1993 HH4 = 1999 VN180  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-20 11:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin