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Posts Tagged ‘Launch’

12/28/2021 – Ephemeris – The James Webb Telescope is on its way to L2

December 28, 2021 Comments off

This is Ephemeris for Tuesday, December 28th. Today the Sun will be up for 8 hours and 50 minutes, setting at 5:09, and it will rise tomorrow at 8:19. The Moon, 2 days past last quarter, will rise at 3:18 tomorrow morning.

The James Webb Space Telescope was launched Christmas morning and is heading out past the Moon’s orbit. It was launched from the European Space Agency’s Spaceport in Kourou, French Guiana on the northeast coast of South America, as part of their contribution to the project. It will orbit a point called Lagrange Point 2, or L2 for short, over four times the Moon’s distance in a direction opposite of the Sun. It will take the telescope 29 days to unfold itself. First order of business was to unfold the solar panels to obtain power, then to deploy its high gain antenna for communications with the Earth. Next to begin to deploy a 5 layer, tennis court sized sun shield. After that, the telescope will be unfolded.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). They may be different for your location.

Addendum

The last view of Webb as it separated from the Ariane 5 launch vehicle

The last view of Webb as it separated from the Ariane 5 launch vehicle. Credit: NASA.

12/23/2021 – Ephemeris – The James Webb Space Telescope to launch Real Soon Now

December 23, 2021 Comments off

This is Ephemeris for Thursday, December 23rd. Today the Sun will be up for 8 hours and 48 minutes, setting at 5:06, and it will rise tomorrow at 8:18. The Moon, 3 days before last quarter, will rise at 9:23 this evening.

One of the problems in recording a week’s worth of programs at once is: one, not having the freshest news; and two, talking about an imminent space launch that gets canceled a day or two before scheduled launch. As of Sunday night, when I’m recording this, the often delayed James Webb Space Telescope is scheduled to be launched at 7:20 (am EST) tomorrow morning* from the European Space Agency’s Spaceport in Kourou, French Guiana on the northeast coast of South America. It will be launched on an Ariane 5 rocket into an orbit that will take the telescope a million miles away, opposite of the direction of the Sun to a gravitational somewhat stable L2 Lagrange point, which it will lazily orbit.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). They may be different for your location.

* See? Delayed again, this time for bad weather. The launch is rescheduled for not earlier than 7:20 am EST Christmas Day. This is why I hate to talk about spacecraft launches before they happen, except in a general way.

Addendum

James Webb Space Telescope trajectory to L2

James Webb Space Telescope trajectory to L2 with some milestones of deployment. “ISIM” stands for Integrated Scientific Instruments Module. Credit: Space Telescope Science Institute (STScI).

Full scale model of the JWST at Goddard Space Flight Center

Full scale model of the James Webb Space Telescope at Goddard Space Flight Center. Note its scale, with the people who worked on it the foreground.

James WebbSpace Telescope, folded

James Webb Space Telescope, folded and ready to be placed atop the Ariane 5 Rocket. After launch and on its way to L2 begins “29 Days of Terror” as various parts of the telescope deploy, including the five layer, tennis court sized, sun shade. Any failure could doom the 10 billion dollar telescope.

07/28/2020 – Ephemeris – The Mars Endurance Rover may launch to Mars on Thursday

July 28, 2020 Comments off

This is Ephemeris for Tuesday, July 28th. Today the Sun will be up for 14 hours and 47 minutes, setting at 9:12, and it will rise tomorrow at 6:26. The Moon, 1 day past first quarter, will set at 1:49 tomorrow morning.

This Thursday at 7:50 am is the first opportunity to launch the Mars 2020 or Perseverance Rover to Mars to arrive on February 18th 2021. The rover will be launched on a United Launch Alliance Atlas 5/Centaur rocket with 4 solid boosters. To send a payload to Mars one must launch within a specific window of time called a launch period. This was originally from July17 to August 11th. Some issues with testing caused a delay to July 30th. The launch period was extended to August 15th. Miss that and it’s a wait of 26 months until Earth and Mars are in the same relative position to try again. The landing area or ellipse is less than 6 miles long on the long axis and partially overlaps an ancient dried river delta that flowed into Jezero crater.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Artist's concept of the Mars 2020 Rover launch

An artist’s concept of the Mars 2020 Rover launch. The rocket is an Atlas V with 4 solid boosters and a Centaur upper stage. Credit NASA.