Talk:Wide-field Infrared Survey Explorer
|A news item involving Wide-field Infrared Survey Explorer was featured on Wikipedia's main page in the In the news section on 15 December 2009.|
|A news item involving Wide-field Infrared Survey Explorer was featured on Wikipedia's main page in the In the news section on 24 August 2013.|
|WikiProject Spaceflight||(Rated C-class, Mid-importance)|
|WikiProject Astronomy||(Rated C-class, High-importance)|
- 1 Launch Date Keeps Being Postponed
- 2 Mission Length Resolution Needed
- 3 The survey will be at least 500 times more sensitive than IRAS
- 4 Detecting Dyson spheres?
- 5 "micron" not correct usage for 10^-6 meter ?
- 6 size range of "brown dwarf"
- 7 Any More Data on the Two Brown Dwarf Bodies Discovered by WISE?
- 8 WISE science data schedule
- 9 Any Pressure on the Wise Team to Release Results Earlier?
- 10 Will there be an April Data Release?
- 11 WISE object notability
- 12 WISE Reactivated to Hunt for Asteroids
- 13 Hibernation period
Launch Date Keeps Being Postponed
As of 0026 PDT on 10 Dec 2009, the launch will be no earlier than 0609 on 12 Dec 2009. The launch was postponed from 11 Dec 2009 due to an issue with the Delta II launch vehicle. Additional postponement due to weather is likely; additional postponement due to other issues is, of course, always possible.
Mission Length Resolution Needed
The JPL Web site for the project expects the primary mission to last 10 months: 1 month for checkout, 6 months for the initial survey pass, then an additional period of approx. 3 months, ending when the science instruments run out of solid hydrogen coolant.
At a presentation by a WISE scientist, it was explained that the mission has two coolants. Two detectors are cooled by solid hydrogen, and two are cooled by liquid hydrogen. There was some ambiguity in the presentation: perhaps he meant that two detectors require solid hydrogen coolant, but two could operate when only liquid hydrogen remained (i.e., a single cooling system, with two phases of coolant). The opinion was expressed that it is hoped that WISE will be able to continue surveying, in a reduced capacity, after the solid hydrogen is no longer available.
In the 10 Aug 2005 paper "Preliminary Design of The Wide-Field Infrared Survey Explorer (WISE)" http://arxiv.org/abs/astro-ph/0508246 I read "Nominal on-orbit lifetime of 7 months" (p.9) but it also says "Cryostat Type 2-stage solid hydrogen, Cryostat Lifetime 13 months + 3.25 months margin" (Table 1, p.2-3). I don't know how to reconcile these two figures. The 13 months may include some months before launch sitting on the ground, or the 7 month mission length is conservative. Or, between the paper in 2005 and launch in 2009 the design may have changed to reduce size/weight. Bealevideo (talk) 21:47, 29 January 2010 (UTC)
- Seven months is the figure I've seen as being the primary mission length. There is a plan for a "warm mission" that would continue to operate instruments after the hydrogen reaches a critical temperature, lasting until the hydrogen gets too warm for any useful results to be obtained. This may be the reason for the 13+ month second figure that Bealevideo found. Hmm. — Huntster (t @ c) 17:39, 1 February 2010 (UTC)
The survey will be at least 500 times more sensitive than IRAS
This is very misleading. The resolution of IRAS was about 70" and that of WISE will be about 6". That's only about 12 times the resolution, not 500 times. (Mollwollfumble (talk) 01:43, 3 September 2009 (UTC))
- I'm slightly confused - you have calculated the improvement in angular resolution, while querying the sensitivity expectations. I have added a line or two on the sensitivity in the Science section, if that is any help. Iridia (talk) 04:25, 3 September 2009 (UTC)
Detecting Dyson spheres?
Will this telescope help with detecting Dyson spheres? If so, perhaps the article should mention it even though it might not be an explicit objective of the mission. - LM 2009-12-15 —Preceding unsigned comment added by 22.214.171.124 (talk) 03:16, 15 December 2009 (UTC)
"micron" not correct usage for 10^-6 meter ?
As of 3 March 2010, Gene Nygaard removed "microns" and replaced them with "micrometers", his edit note mentions that "microns were thrown out in the '60s".
It's probably no big deal. But I find it confusing, because the very article that is referenced,  http://wise.ssl.berkeley.edu/documents/WISESPIE_SanDiego05.pdf by Mainzer et.al. (2005), uses those units! To quote from the abstract of the referenced article, "[WISE...] will survey the entire sky in four bands from 3.3 to 23 microns". So the term is in current use. I don't have a reference as to what is formally correct. See also: http://en.wikipedia.org/wiki/Micrometre which mentions: "NOTE: The American spelling of "micrometer" is rarely used (micron is typically used instead), due to the existence of a measuring device of the same name."
- Microns are fine. They're not the SI name for the unit. So? Not everyone uses SI. In particular, astronomers and electrical engineers talk in microns. --Trovatore (talk) 01:11, 5 March 2010 (UTC)
size range of "brown dwarf"
Right now, the article contains the sentence: "A small brown dwarf of 2–3 Jupiter masses would be visible at a distance of up to two to three parsecs." and that reference ( http://www.planetary.org/blog/article/00002070/ ) says this would be a "lightweight brown dwarf".
I don't know if this is needlessly pedantic, but according to http://www.dtm.ciw.edu/boss/definition.html brown dwarfs start at 13 Mj and anything smaller than that is either a "sub-brown dwarf" or a planet. There is also an article by that name: http://en.wikipedia.org/wiki/Sub-brown_dwarf Bealevideo (talk) 05:50, 12 March 2010 (UTC)
Any More Data on the Two Brown Dwarf Bodies Discovered by WISE?
Any More Data on the Two Brown Dwarf Bodies Discovered by WISE?
Have they been parallaxed (trajectory determined) and if so where are they in relation to our solar system? Any such data should be added to the article and properly cited.
WISE science data schedule
Article says: "A planned release of survey data (as and overlapping set of 4 megapixel images) expected in April 2010, has apparently been delayed." Is there a reference for this? I thought the initial data release wasn't planned until 2011? Likewise, article says "The WISE group's bid for continued funding for an extended "warm mission" was recently scored low by a NASA review board, in part because of a lack of outside groups publishing on WISE Data." This seems odd, given that if no data is released yet, as planned, clearly no outside groups will have published on it yet.
"Data from the mission will be released to the astronomical community in two stages: a preliminary release will take place six months after the end of the survey, or about 16 months after launch, and a final release is scheduled for 17 months after the end of the survey, or about 27 months after launch." Source: http://www.nasa.gov/mission_pages/WISE/mission/index.html Bealevideo (talk) 20:25, 6 July 2010 (UTC)
Any Pressure on the Wise Team to Release Results Earlier?
Why are they releasing it all at once in April 2011? Why can't they release some sooner?
Are there any citations available for anyone pressuring them to release some findings sooner?
- This is standard procedure for science results. This allows the primary investigators and related folks to prepare their own research papers, and to get all the data composed and ready for release. This really isn't unusual. — Huntster (t @ c) 04:08, 24 November 2010 (UTC)
Will there be an April Data Release?
And if so, when in April?
I'm having a hard time finding out either way, based on articles I have read so far.
WISE object notability
WISE Reactivated to Hunt for Asteroids
http://www.nasa.gov/mission_pages/WISE/news/wise20130821.html — Preceding unsigned comment added by 126.96.36.199 (talk) 11:09, 22 August 2013 (UTC)
"The spacecraft was put into hibernation on February 1, 2011.". This is interesting. How do you put the spacecraft into hibernation - or rather, why? This article would benefit from explanation why the telescope was shut down for 2 years, and an article on hibernation (spacecraft) may be useful to create. --Piotr Konieczny aka Prokonsul Piotrus| reply here 08:20, 24 August 2013 (UTC)