Aeronautics Industry Aeronautics Industry    FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Inclination angles for LEO satellites Goto page 1, 2  Next          Aeronautics Industry Forum Index -> Aeronautics Industry View previous topic :: View next topic   Author Message Dave Michelson Guest Posted: Mon Jun 11, 2007 11:00 pm    Post subject: Inclination angles for LEO satellites Hi, all. I'm looking for the most common altitudes and inclination angles for LEO satellites. I found the distribution of altitudes easily enough. See http://satjournal.tcom.ohiou.edu/issue6/current_debris2.html What I need now is a similar result for inclination angles. If you can help, I would be most appreciative. -- Dave Michelson davem@ece.ubc.ca Back to top   Ads Advertising Sponsor Rand Simberg Guest Posted: Mon Jun 11, 2007 11:05 pm    Post subject: Re: Inclination angles for LEO satellites On Mon, 11 Jun 2007 19:00:00 GMT, in a place far, far away, Dave Michelson <davem@ece.ubc.ca> made the phosphor on my monitor glow in such a way as to indicate that: Quote: Hi, all. I'm looking for the most common altitudes and inclination angles for LEO satellites. I found the distribution of altitudes easily enough. See http://satjournal.tcom.ohiou.edu/issue6/current_debris2.html What I need now is a similar result for inclination angles. If you can help, I would be most appreciative. I don't have any data, but my guess is that sun-synch would dominate (i.e., about 98 degrees, though exact inclination is of course a function of altitude). Back to top   Ads Advertising Sponsor Dave Michelson Guest Posted: Mon Jun 11, 2007 11:58 pm    Post subject: Re: Inclination angles for LEO satellites Rand Simberg wrote: Quote: Hi, all. I'm looking for the most common altitudes and inclination angles for LEO satellites. I found the distribution of altitudes easily enough. See http://satjournal.tcom.ohiou.edu/issue6/current_debris2.html What I need now is a similar result for inclination angles. If you can help, I would be most appreciative. I don't have any data, but my guess is that sun-synch would dominate (i.e., about 98 degrees, though exact inclination is of course a function of altitude). I suspect you're right. Interestingly enough, the 600-800 km peak in the altitude PDF corresponds to the "optimum" altitude for a satellite in a 98-degree sun synchronous orbit. Other peaks would correspond to the large LEO comsat constellations such as Orbcomm, Iridium, and Globalstar. If one had access to the NORAD TLE data base, I suppose that one could easily run the numbers but I gather that it's been locked down. Or has it? -- Dave Michelson davem@ece.ubc.ca Back to top   Ads Advertising Sponsor Rand Simberg Guest Posted: Tue Jun 12, 2007 12:13 am    Post subject: Re: Inclination angles for LEO satellites On Mon, 11 Jun 2007 19:58:53 GMT, in a place far, far away, Dave Michelson <davem@ece.ubc.ca> made the phosphor on my monitor glow in such a way as to indicate that: Quote: Rand Simberg wrote: Hi, all. I'm looking for the most common altitudes and inclination angles for LEO satellites. I found the distribution of altitudes easily enough. See http://satjournal.tcom.ohiou.edu/issue6/current_debris2.html What I need now is a similar result for inclination angles. If you can help, I would be most appreciative. I don't have any data, but my guess is that sun-synch would dominate (i.e., about 98 degrees, though exact inclination is of course a function of altitude). I suspect you're right. Interestingly enough, the 600-800 km peak in the altitude PDF corresponds to the "optimum" altitude for a satellite in a 98-degree sun synchronous orbit. Other peaks would correspond to the large LEO comsat constellations such as Orbcomm, Iridium, and Globalstar. That's probably LEO, to first order. Quote: If one had access to the NORAD TLE data base, I suppose that one could easily run the numbers but I gather that it's been locked down. Or has it? Are you looking for satellites currently in orbit, or historically? Jonathan's Space Report might have a text file of all (unclassified) launches that you could Perl out some results from. Back to top   Ads Advertising Sponsor David Schneider Guest Posted: Tue Jun 12, 2007 2:18 pm    Post subject: Re: Inclination angles for LEO satellites Rand Simberg wrote: Quote: Are you looking for satellites currently in orbit, or historically? Jonathan's Space Report might have a text file of all (unclassified) launches that you could Perl out some results from. Dr. Kelso's site probably has still has a fairly complete list of TLE's. I used that site most when I was keeping up with stsplus, but I still visit from time to time. /dps Back to top   Ads Advertising Sponsor snidely Guest Posted: Wed Jun 13, 2007 1:21 am    Post subject: Re: Inclination angles for LEO satellites On Jun 12, 3:18 am, David Schneider <snide...@isp.com> wrote: Quote: Dr. Kelso's site probably has still has a fairly complete list of TLE's. I used that site most when I was keeping up with stsplus, but I still visit from time to time. That would be <http://celestrak.com/NORAD/elements/>, wouldn't it? /dps Back to top   Ads Advertising Sponsor robert casey Guest Posted: Wed Jun 13, 2007 8:21 am    Post subject: Re: Inclination angles for LEO satellites Quote: inclination angles. Unless a satellite needed a specific inclination for its application, the inclination would likely be that of the launch site. Cape Canaveral is around 27 degrees, and Russia's launch site is something like 51 degrees. Odds are you'll find a clumping at these two values. Back to top   Ads Advertising Sponsor Dave Michelson Guest Posted: Wed Jun 13, 2007 1:33 pm    Post subject: Re: Inclination angles for LEO satellites snidely wrote: Quote: On Jun 12, 3:18 am, David Schneider <snide...@isp.com> wrote: Dr. Kelso's site probably has still has a fairly complete list of TLE's. I used that site most when I was keeping up with stsplus, but I still visit from time to time. That would be <http://celestrak.com/NORAD/elements/>, wouldn't it? Indeed it is. Thanks :-) -- Dave Michelson davem@ece.ubc.ca Back to top   Ads Advertising Sponsor Allen Thomson Guest Posted: Wed Jun 13, 2007 7:17 pm    Post subject: Re: Inclination angles for LEO satellites On Jun 11, 2:00 pm, Dave Michelson <d...@ece.ubc.ca> wrote: Quote: What I need now is a similar result for inclination angles. Would p.5 of http://www.spaceelevator.com/docs/800Carroll.pdf help? Back to top   Ads Advertising Sponsor Dave Michelson Guest Posted: Wed Jun 13, 2007 8:44 pm    Post subject: Re: Inclination angles for LEO satellites Allen Thomson wrote: Quote: On Jun 11, 2:00 pm, Dave Michelson <d...@ece.ubc.ca> wrote: What I need now is a similar result for inclination angles. Would p.5 of http://www.spaceelevator.com/docs/800Carroll.pdf help? Thanks, that's very helpful! I presume 'other' is mostly ESA. If so, I had no idea they had put up so many satellites into near equatorial LEO. -- Dave Michelson davem@ece.ubc.ca Back to top   Ads Advertising Sponsor Rand Simberg Guest Posted: Wed Jun 13, 2007 8:56 pm    Post subject: Re: Inclination angles for LEO satellites On Wed, 13 Jun 2007 16:44:06 GMT, in a place far, far away, Dave Michelson <davem@ece.ubc.ca> made the phosphor on my monitor glow in such a way as to indicate that: Quote: Allen Thomson wrote: On Jun 11, 2:00 pm, Dave Michelson <d...@ece.ubc.ca> wrote: What I need now is a similar result for inclination angles. Would p.5 of http://www.spaceelevator.com/docs/800Carroll.pdf help? Thanks, that's very helpful! I presume 'other' is mostly ESA. If so, I had no idea they had put up so many satellites into near equatorial LEO. Well, they're the only ones who can (except Sea Launch). Not sure that's a good enough reason to do it, though. I wonder why? It doesn't seem like a very useful orbit. Back to top   Ads Advertising Sponsor thomsona@flash.net Guest Posted: Wed Jun 13, 2007 10:35 pm    Post subject: Re: Inclination angles for LEO satellites On Jun 11, 2:58 pm, Dave Michelson <d...@ece.ubc.ca> wrote: Quote: If one had access to the NORAD TLE data base, I suppose that one could easily run the numbers but I gather that it's been locked down. Or has it? "Supervised" is perhaps better than "locked down." You have to apply, agree to the terms of usage (which are slightly weird but not particularly oppressive), and get approved for access. After that, it's very user-friendly, generally better than the NASA version that preceded it. If you're interested, go to http://www.space-track.org/perl/login.pl and look at "Create a New Account". Back to top   Ads Advertising Sponsor Chris Jones Guest Posted: Thu Jun 14, 2007 2:24 am    Post subject: Re: Inclination angles for LEO satellites robert casey <wa2ise@ix.netcom.com> writes: Quote: inclination angles. Unless a satellite needed a specific inclination for its application, the Which it usually does. Quote: inclination would likely be that of the launch site. Cape Canaveral is around 27 degrees, and Russia's launch site is something like 51 degrees. Odds are Actually, Baikonur is closer to 48 degrees, and Plesetsk (which at various times is either the most common or 2nd most common Russian launch site) is close to 63 degrees. Neither uses those as inclinations, as a rule, as payload considerations and where the launch stages fall dictate other than due easterly launch azimuths, as they do for launches from KSC and Vandenberg, the two most popular US launch sites (and really, every other launch site). > you'll find a clumping at these two values. Back to top   Ads Advertising Sponsor Dave Michelson Guest Posted: Thu Jun 14, 2007 11:15 am    Post subject: Re: Inclination angles for LEO satellites Rand Simberg wrote: Quote: What I need now is a similar result for inclination angles. Would p.5 of http://www.spaceelevator.com/docs/800Carroll.pdf help? Thanks, that's very helpful! I presume 'other' is mostly ESA. If so, I had no idea they had put up so many satellites into near equatorial LEO. Well, they're the only ones who can (except Sea Launch). Not sure that's a good enough reason to do it, though. I wonder why? It doesn't seem like a very useful orbit. Agreed! (Of course, the ordinate in the graph is radar cross section so we don't really know exactly what the objects are except that they're man-made.) -- Dave Michelson davem@ece.ubc.ca Back to top   Ads Advertising Sponsor Dave Michelson Guest Posted: Thu Jun 14, 2007 5:55 pm    Post subject: Re: Inclination angles for LEO satellites Dave Michelson wrote: Quote: Rand Simberg wrote: What I need now is a similar result for inclination angles. Would p.5 of http://www.spaceelevator.com/docs/800Carroll.pdf help? Thanks, that's very helpful! I presume 'other' is mostly ESA. If so, I had no idea they had put up so many satellites into near equatorial LEO. Well, they're the only ones who can (except Sea Launch). Not sure that's a good enough reason to do it, though. I wonder why? It doesn't seem like a very useful orbit. Agreed! (Of course, the ordinate in the graph is radar cross section so we don't really know exactly what the objects are except that they're man-made.) I found some very nice scatter plots showing the number of objects with mass > 1 mg or diameter > 1 cm over altitudes between 100 and 100000 km (log scale) and inclination angles between 0 and 165 degrees in a journal article, C. Pardini and L. Anselmo, "Assessing the Risk of Orbital Debris Impact," Space Debris. Dordrecht: 1999. Vol. 1, Iss. 1; p. 59-80. There's no evidence of a spike in equatorial LEO as seen in the figure on page 5 of Carroll. -- Dave Michelson davem@ece.ubc.ca Back to top   Ads Advertising Sponsor Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         Aeronautics Industry Forum Index -> Aeronautics Industry All times are GMT Goto page 1, 2  Next Page 1 of 2   Jump to: Select a forum Aeronautics Industry----------------Aeronautics Industry  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Australian Debt Consolidation Experts medical insurance Wedding Recensioni dei principali siti Escort/Accompagnatrici (BestAnnunci, Piccoletrasgressioni, Incontriitalia ...) 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