+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   14827 Hypnos (1986 JK) Classification: Apollo [NEO, PHA]          SPK-ID: 2014827 [ 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 52 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .6661747233717422 2.5765e-08   a 2.841807725680701 2.1163e-08 au q .9486672501496801 7.3335e-08 au i 1.980219387636799 1.2301e-05 deg node 57.96181659912495 0.00019742 deg peri 238.1318398967857 0.00020205 deg M 93.84594539912941 2.4478e-05 deg tp 2458744.354415002816 (2019-Sep-17.85441500) 0.00011407 TDB period 1749.80826183365 4.79 1.9546e-05 5.351e-08 d yr n .2057368272011418 2.2982e-09 deg/d Q 4.734948201211722 3.5261e-08 au   Orbit Determination Parameters    # obs. used (total)      187      # delay obs. used      0      # Doppler obs. used      10      data-arc span      12022 days (32.91 yr)      first obs. used      1986-05-04      last obs. used      2019-04-03      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .64984      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 00:40:13   Additional Information  Earth MOID = .0144502 au   Jupiter MOID = .529215 au   T_jup = 2.933  [ 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 18.3   n/a PDS3 (MPO 12)   diameter diameter 0.9 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed dark albedo (0.06) B-V BV 0.684   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=4.74 deg. U-B UB 0.492   0.039 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=4.74 deg. 14827 Hypnos           Discovered 1986 May 5 by C. S. Shoemaker and E. M. Shoemaker at Palomar. Hypnos was the Greek god of sleep and twin brother of death. He entered the sleep of mortals and gave them, at the bidding of the Olympians, dreams of foolishness or inspiration, depending on the individual and their divine protectors or enemies. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20030106/MPCPages.arc Last Updated: 2003-10-02 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-17 09:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin