Talk:Wide Field Infrared Survey Telescope

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Same Lagrangian L2 orbit as Webb?[edit]

So this telescope and James Webb Space Telescope will both be at L2? I'm curious if any word on how close they will be, or how they are kept from collision. Tom Ruen (talk) 07:21, 20 February 2016 (UTC)

This page [1] says WFIRST will be in geosynchronous orbit, close to the earth, not L2. Is the Reference system Sun–Earth L2 wrong in the stat table? Tom Ruen (talk) 07:32, 20 February 2016 (UTC)
And here from 4/24/2014 [2] "The SDT considered both geosynchronous and Sun-Earth L2 (2nd Lagrange point, further from the sun than the Earth) orbit options and selected a 28.5 inclined, geosynchronous orbit as the baseline for this study. The primary factor that drove the selection of this orbit is the ability to continuously downlink data to the ground and obtain a much higher science data rate."
But here Feb 18, 2016 NASA Introduces New, Wider Set of Eyes on the Universe: Baltimore's Space Telescope Science Institute to Partner on New NASA 'Wide-View' Space Telescope says "The observatory will begin operations after traveling to a gravitational balance point known as Earth-sun L2, which is located about one million miles from Earth in a direction directly opposite the sun."
As referred to for orbits, L2 isn't a single place; both JWST and WFIRST would be in a loose orbit around L2. The scale of the orbit is around a million km and the size of the spacecraft relatively minuscule and the locations well known. During station-keeping maneuvers, it will be straightforward to avoid collisions. Dbenford (talk) 16:58, 23 February 2016 (UTC)

OK, I see on Jan 11, 2016, this article was changed with orbit changed to L2 diff. So I think this fact needs to be documented in the article, that there was a choice between two orbits, and that geosynch was picked first, and then switched to L2, and explaining WHY! Tom Ruen (talk) 11:11, 20 February 2016 (UTC)

I have added a paragraph on the Geo/L2 trade based on the 2015 Final Report, Appendix C, which documents this. Dbenford (talk) 16:58, 23 February 2016 (UTC)

Launch Vehicle[edit]

As stated by ULA, the Boeing Delta IV is in the process of being retired (in the next few years). A Delta IV rocket will not be available to launch a telescope in 2025. My suggestion is to list "TBD" as the rocket until a launch contract has been procured with a rocket that will still exist during this time frame. — Preceding unsigned comment added by Martin Cash (talkcontribs) 19:09, 25 July 2016 (UTC)

ULA has said they are going to phase out Delta IV, but not Delta IV Heavy: "ULA Targets 2018 for Delta 4 Phase-out, Seeks Relaxation of RD-180 Ban".  Rob (talk) 10:37, 29 July 2016 (UTC)
I agree with Martin Cash. Until there is a launch contract, we should list "TBD". Cheers, BatteryIncluded (talk) 13:16, 29 July 2016 (UTC)