+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   69 Hesperia (A861 HC) Classification: Main-belt Asteroid          SPK-ID: 2000069 [ 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 124 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1702603055396135 3.2053e-08   a 2.976822651103346 7.7347e-09 au q 2.469987916989248 9.4797e-08 au i 8.590967437432171 3.8213e-06 deg node 184.9850108400011 2.3722e-05 deg peri 289.1127733990655 2.6496e-05 deg M 17.8971398321458 1.2603e-05 deg tp 2458907.237081921060 (2020-Feb-27.73708192) 6.5513e-05 TDB period 1875.978554300247 5.14 7.3115e-06 2.002e-08 d yr n .1918998483083846 7.4792e-10 deg/d Q 3.483657385217444 9.0516e-09 au   Orbit Determination Parameters    # obs. used (total)      3241      data-arc span      58275 days (159.55 yr)      first obs. used      1861-04-29      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42743      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 19:31:17   Additional Information  Earth MOID = 1.50238 au   Jupiter MOID = 1.70641 au   T_jup = 3.222  [ hide covariance matrix ] Orbital Elements at Epoch 2454304.5 (2007-Jul-23.0) TDB Reference: JPL 124 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1679548282777342 3.2216e-08   q 2.47751719172965 9.5095e-08 au tp 2455160.283442729215 (2009-Nov-24.78344273) 6.1727e-05 TDB node 185.077426774259 2.375e-05 deg peri 289.9264801367241 2.6592e-05 deg i 8.582113821367001 3.8185e-06 deg   Orbit Determination Parameters    # obs. used (total)      3241      data-arc span      58275 days (159.55 yr)      first obs. used      1861-04-29      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42743      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 19:31:17   Additional Information  Jupiter MOID = 1.70641 au   T_jup = 3.222  Orbit Covariance (6×6)   e q tp node peri i e 1.037898448024911E-15 -3.056870548189481E-15 -1.154094718307005E-13 7.475945426724657E-15 -3.227242994511068E-15 4.696456912683513E-16 q -3.056870548189481E-15 9.043133614469543E-15 4.018278358794302E-13 -2.042586873065366E-14 1.327287432867317E-14 -8.289886299407164E-16 tp -1.154094718307005E-13 4.018278358794302E-13 3.810246715886985E-9 -1.378945800112508E-11 7.490501260341134E-10 1.196608965242185E-12 node 7.475945426724657E-15 -2.042586873065366E-14 -1.378945800112508E-11 5.64068369779622E-10 -5.601387918409557E-10 1.036747154004028E-11 peri -3.227242994511068E-15 1.327287432867317E-14 7.490501260341134E-10 -5.601387918409557E-10 7.07134438524914E-10 -9.968380548200426E-12 i 4.696456912683513E-16 -8.289886299407164E-16 1.196608965242185E-12 1.036747154004028E-11 -9.968380548200426E-12 1.458104710077207E-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 7.2   n/a MPO492748 IRAS observations used: 3 magnitude slope G 0.19   n/a PDS3 (MPC 17257) Fit diameter diameter 138.13 km 4.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3 rotation period rot_per 5.655 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Poutanen, M.; Bowell, E.; Martin, L.J.; Thompson, D.T. (1985) Astron. Astrophys. Suppl. Ser. 61, 291-297.] [Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.] [Velichko, F.P.; Krugly, Yu.N. (1989) In 'Methods of investigation of movement, physics and dynamic of Solar System small bodies, Dushanbe, p. 14-15 (in Russian).] [De Angelis, G.; Mottola, S. (1995) Planet. Space Sci. 43, 1013-1017.] [Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.] [Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.] [Shevchenko, V.G.; Velichko, F.P.; Checha, V.A.; Krugly, Y.N. (2014) Minor Planet Bull. 41, 195-198.] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.1402   0.010 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3 B-V BV 0.674   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=6.83, mean=7.96, max.=9.99) deg. U-B UB 0.230   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=6.83, mean=7.96, max.=9.99) deg. Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 69 Hesperia (A861 HC)          Discovered 1861-Apr-29 by Schiaparelli, G. at Milan Reference: 20150829/MPCPages.arc Last Updated: 2015-09-02 [ show close-approach data ] Alternate Designations  A861 HC = 1932 CM1 = 1945 NB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-20 11:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin