Talk:Low Earth orbit

message: It'd be nice to have some comparison of the delta-V for LEO vs GEO.  The Delta-v article seems to say it's an extra 40% from LEO to GEO?  -jholman
SpaceShipOne was most certainly in Low Earth Orbit!  —Preceding unsigned comment added by 90.235.12.75 (talk) 19:59, 7 August 2008 (UTC)
replies: text: SpaceShipOne was not in any orbit.  It was sub-orbital, though it did enter the region of space in which low earth orbits exist.  The leading sentence needs to be corrected to reflect that LEO is an orbit, not a region of space. I will do this. Sanchazo (talk) 15:27, 25 May 2016 (UTC)
thread_title:  Old Comments 

message: I'd question " with a low angle of inclination".  A polar orbit is different, although I suppose its altitude could be the same, but I can't see a magic point at say 45deg that makes it no longer LEO.  Citation?  Midgley 23:41, 2 April 2006 (UTC)
thread_title:  Inclination? 

message: I'm thinking the following should be yanked as it discusses other orbits besides LEO.  The "see also" should be sufficient to link for such information.
::Higher orbits include medium Earth orbit (MEO) (sometimes called intermediate circular orbit (ICO)), and far above, Geosynchronous orbit (GSO).  Orbits higher than this are subject to early electronic failure because of intense radiation and charge accumulation. Orbits with a high inclination angle are usually called polar orbits, the properties of this and the sun-synchronous orbit being more significant than their altitude. 
::Thoughts?—Taka2007 05:56, 25 August 2006 (UTC)
replies: text: I doubt it is doing any harm.  It would be likely to be re-added by anyone passign by.  It would be entirely logical to collapse it all into a single article on orbits around earth used for satellites, which would be a fairly chunky page of some merit, and could have all these pages redirect to it.  Shall we rationalise it like that?  Midgley 11:22, 25 August 2006 (UTC)
replies: text:  Good point.  I brought it up because there were quite a few inconsistencies between a variety of entries related to orbits.  One stop shopping should solve that.  —Taka2007 14:06, 25 August 2006 (UTC)
thread_title:  Remove info about other orbits? 

message: Need to add some info about equatorial low Earth orbits.  They have several advantages (low Delta-V, rapid revists for low latitude sites). -Taka2007 00:15, 22 October 2006 (UTC)
thread_title:  Equatorial low Earth orbit 

message: Shouldn't the title of this article be Low-Earth orbit? JulesH 12:45, 21 January 2007 (UTC)
replies: text: Scratch that.  It's the orbit that's low, not Earth.  Duh. JulesH 13:01, 21 January 2007 (UTC)
replies: text: Scratched ;) Winston.PL 21:38, 15 September 2007 (UTC)
thread_title:  Article title? 

message: The passage about weightlessness makes no sense.  The strength of the local gravity field makes no difference.  You can be weightless deep in the atmosphere (on a plane in a dive) in orbit, or in intergalactic space.  Weightlessness is an effect of being in free-fall with respect to your local gravity field, not the strength of that field.  —Preceding unsigned comment added by Vaxalon (talk • contribs) 02:53, August 29, 2007 (UTC) 
:Probably many people think that the weightlessness is caused by the "large" distance from the Earth. That is the reason for the clarification.--Patrick 11:40, 29 August 2007 (UTC)
thread_title:  Weightlessness? 

message: Currently the link to the fact sheet that lists how many objects are currently tracked is broken and I could not find the location of the new page on the new website.Ergzay (talk) 10:49, 4 February 2009 (UTC)
thread_title:  Broken Refrence Link 

message: The first link is dead. Русские идут! (talk) 13:43, 31 December 2010 (UTC)
thread_title:  Dead link 

message: Maybe not the right discussion page for this, but the graphic File:Orbitalaltitudes.jpg is bothersome, as text for GPS includes the phrase "meaning that they orbit the earth in exactly 12 hours (twice per day)" -- I believe GPS orbits are actually 11hrs 58min, corresponding to twice per siderial day, not solar day.  I don't think that this distinction is clear in the graphic, which is possibly misleading (especially given the use of the phrase "exactly 12 hours").  — Preceding unsigned comment added by 184.91.21.205 (talk) 22:23, 25 June 2011 (UTC)
thread_title:  bad graphic 

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thread_title: File:Orbitalaltitudes.jpg Nominated for Deletion

message: 1) A first source in the article,
:
, defines LEO as
:"Region A, Low Earth Orbit (or LEO) Region – spherical region that extends from the Earth’s surface up to an altitude (Z) of 2,000 km"
and the second,
:
explains that: "Low Earth orbit - The region of space to 2000 km altitude".
Why then "" is mentioned as LEO lower limit? Searching for leo orbit 2000 in Google-books gives multiple lower limits: nothing, 160, 200, 300, 400, 500 or just "a few hundred km". NASA & IADC documents and, IMHO, most of the other books - doesn't define any lower limit.
2) Why "the Hubble Space Telescope repair missions" - are specially mentioned? Orbit  is well inside all possible LEO limits. --Alogrin (talk) 06:47, 30 October 2012 (UTC)
thread_title:  1) LEO limits. 2) Hubble repair missions 

message: The article only puts key figures (like speed required for attaining low earth orbit) in metric terms like kilometers. This is rude to hundred of millions of people raised in countries where miles are used rather than kilometers. Both measurements should be provided. Failing to do so is inconsiderate. 
184.183.173.20 (talk) 18:22, 8 November 2012 (UTC)
replies: text: See http://en.wikipedia.org/wiki/Template:Convert on how to do automatic conversions. Martijn Meijering (talk) 18:35, 8 November 2012 (UTC)
thread_title: Metric Bias in Writing

message: Here is the first sentence of the article. What does the period of time mean?
"A low Earth orbit (LEO) is an orbit around Earth with an altitude between , with a period of about 88 minutes, and , with a period of about 127 minutes.--Wyn.junior (talk) 18:15, 17 March 2014 (UTC)
replies: text: It means how long it takes to go once around the Earth.  (More generally, for any repeating motion, it's the time to do one complete cycle.)  I've put a link in to Orbital period to help.  Djr32 (talk) 21:34, 17 March 2014 (UTC)
replies: text: Orbits are orbiting in only 88 minutes? Isnt that kinda fast? I have a lot of learning yet to do.--Wyn.junior (talk) 00:18, 18 March 2014 (UTC)
replies: text: Yes; the limit is about 86 min for an orbit at sea level (doesn't happen, of course.) Wwheaton (talk) 05:58, 16 June 2015 (UTC)
thread_title:  First sentence, what does "period" mean? 

message: What (sourced!) does LEO go to?  Is it from 100 miles to 2000 km or (per this change) 100 to 200 miles?  Andy Dingley (talk) 13:46, 19 January 2017 (UTC)
thread_title:  Height limit? 

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thread_title:  External links modified 

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message: I don't understand the "because" in the following statement: "While definitions based on altitude are inherently ambiguous, most of them fall within the range specified by an orbit period of 128 minutes because, according to Kepler's third law, this corresponds to a semi-major axis of 8,413 km (5,228 mi)." (emphasis mine) According to Kepler's third law, a period of 128 minutes corresponds to a semi-major axis of 5,228 mi. So what? Is there anything special about that geocentric distance? If so, it should be written what. If not, the because should be replaced by "and" or "which" or something. Glasfaser Wien (talk) 14:36, 25 September 2023 (UTC)
thread_title:  Why "because"?