JPL Horizons (Version 3.75) Apr 04, 2013 PURPOSE: The Horizons On-Line Ephemeris System provides access to key solar system data and dynamic production of highly accurate ephemerides for solar system objects. Updated Ephemeris for ISEE-3 at JPL Horizons. 1. Revised: Jun 05, 2014 ISEE-3/ICE Spacecraft -111 (Heliocentric) UPDATE (2014-Jun … NEA Stats 2020-Nov-11. The black spots formed because the craters exposed cleaner material beneath the dusty surface. Specifically, close approaches with 3-sigma time uncertainty greater than 10 days or 3-sigma nominal-distance uncertainty greater than 0.1 au are excluded. Visualize the orbits of the main Solar System objects in an interactive 3D Solar system Simulator. The two black spots are recent impact craters. Moons in Our Solar System 200+ MORE 10 THINGS November 25 The Roundup The latest from around your galactic neighborhood. Horizons; Solar System Dynamics; Next NEO Close Approach within 10 Lunar Distances (LD) Object: 2020 VC1: Date: 2020-Nov-12 14:19 ± < 00:01 (hh:mm) Dist: 4.27 LD (min: 4.27 LD) H: 25.5 : See our Close Approach Tables for more on this object and other NEOs. Featured Fresh Craters on Mars This image shows terrain near Mangala Valles. Object Data Page. Since uncertainties typically grow with time away from epoch, this filter puts an implicit limit on the time period over which the close approaches are listed. Source: JPL Horizons Ephemeris Type: OBSERVER Target Body: ICE Spacecraft (ISEE-3) [-111] Observer Location: Geocentric [500] Time Span: Start=2014-06-05, Stop=2014-07-05, Step=1 d Table Settings: defaults. Read more Sentinel-6 Michael Freilich Satellite … Units: AU and KM/S 1-way_LT = Target 1-way light-time, as seen by observer. (Vokrouhlicky, 1997). ***** JPL On-Line Ephemerides Horizons ***** Target body : Wild 2 ... Target apparent heliocentric range ("r") and range-rate ("rdot") as seen by observer. Units: AU and KM/S delta deldot = Target apparent range ("delta") and range-rate ("delta-dot") relative to observer. Note that nine digits of accuracy for the solar interaction corresponds to <1 mas/yr in precession rates so that even small effects such as lunar gravity and relativity are important. APPENDIX 2 Full listing of the JPL Horizons Output File (CSV format) ***** Revised: Jul 31, 2013 Mercury 199 / 1 GEOPHYSICAL DATA (updated 2008-Feb-07): Mean radius (km) = 2440(+-1) Density (g cm^-3) = 5.427 Mass (10^23 kg ) = 3.302 Flattening, f = Volume (x10^10 km^3) = 6.085 Semi-major axis = Sidereal rot. Table 3 shows contributions to precession rates from several types of interactions (Chapront-Touzé and Chapront, 1983). Approximate positions available between 1900 to 2100 date range. By Keith Cowing on June 6, 2014 12:36 PM. 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