Home > Comet, Ephemeris Program, NASA > 10/26/2015 – Ephemeris – RIP Robert Farquhar interplanetary navigator extraordinaire

10/26/2015 – Ephemeris – RIP Robert Farquhar interplanetary navigator extraordinaire

October 26, 2015

Ephemeris for Monday, October 26th.  The Sun will rise at 8:12.  It’ll be up for 10 hours and 28 minutes, setting at 6:40.   The Moon, 1 day before full, will set at 8:10 tomorrow morning.

This morning Jupiter and Venus appear close together in the morning sky.  They are said to be in conjunction.  Also Venus is at its greatest separation from the Sun today.  It will slowly begin to fall back toward the Sun.  Last week Sunday Robert Farquhar died.  He developed the technique of orbiting the L1 point between the Sun and the earth where the Earth nullifies the Sun’s gravity, so a spacecraft can stay there between the Earth and the Sun.  He designed the trajectory for the ISEE-3 spacecraft that acted as an early warning for particles coming from the Sun.  He also liberated it in 1982 and through a series of ingenious maneuvers worked it into a solar orbit that flew it through the tail of Comet Giacobini-Zinner.

Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.



ISEE-3’s orbital path to the halo orbit at the Earth-Sun Lagrangian L1 point and out to cross the path of Comet Ziacobini-Zinner ahead of the fleet heading to Comet Halley. It was renamed ICE (International Comet Explorer). Credit: NASA/GSFC

Here’s a link to a page that recounts the quest to return the spacecraft to its L1 position by Farquhar and his band of “rouges” last year.

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