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This topic has moved here: Subject: Sanghelios sky.
  • Subject: Sanghelios sky.
Subject: Sanghelios sky.

I'm writing a fanfiction which will involve humans on sanghelios, and therefore, I have to explore everything about Elites and their homeworld. A couple of weeks ago, I came to the question; how is the year/day cycle on Sanghelios?

I have tried to understand how it would look from the surface, and (with a lot of mind-blam!-s), have come pretty far with the question.

In order to understand everything, I looked up triple star systemes, which Sanghelios is a part of. I came to the conclusion that Sanghelios must rotate around a single star, if it would be habitable and stable. That means all star systems would be dismissed except for this one:

Triple star system

Can you help me out?

P.S: Remember that Sanghelios has 2 moons and that it is unkwon if it has a tilted axis or not.

  • 01.06.2012 10:52 AM PDT

Posted by:ScubaToaster
Posted by: HipiO7
This man, this man right here put it so eloquently that I actually cancelled my own 2000+ word long post.
/slow clap for respect


:)
The person who said participating is important, not winning, obviously never won anything.

Cole Protocole, Evolutions and Glasslands should help you in what you are looking for. I cant remember much detail about this subject.

  • 01.06.2012 10:59 AM PDT
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Do not waste your tears, I was not born to watch the world grow dim. Life is not measured in years, but by the deeds of men.

Posted by: goldhawk
We should know better, because we are better.

My advice is to watch the Duel and Origins from Halo legends. The Duel is set on Sangheilios and has plenty of good scenes fro you to use as a reference.

  • 01.06.2012 11:05 AM PDT


Posted by: HipiO7
Cole Protocole, Evolutions and Glasslands should help you in what you are looking for. I cant remember much detail about this subject.

Thanks, but I'm afraid that it'll take a while for me to find out. I don't own any halo book atm, but I'm gonna get them, and the forerunner trilogy and all of that is gonna have to wait a while :/ Anyway, thanks for commenting.

  • 01.06.2012 11:37 AM PDT


Posted by: Xd00999
My advice is to watch the Duel and Origins from Halo legends. The Duel is set on Sangheilios and has plenty of good scenes fro you to use as a reference.

Thanks for the advice. I don't really remember if it was shown or not, but maybe I missed it. I might not however use this as a solid canon source, as Halo Legends show Halo canon wrongly and illogically at times.

  • 01.06.2012 11:39 AM PDT

"Find where the liar hides, so that I may place my boot between his gums!" - Rtas 'Vadum

Well, I don't think the days would be any longer than ours. If a planet rotates too slowly, then I think one side gets baked by the sun due to the long exposure times, whilst the other side plummets. Think about how hot it gets in the hours between midnight and 3pm on a summers day, and then double that for 42 hour days, etc. Same with freezing conditions.

As for Sanghelios' position in that pic, would it not be more likely that the planets orbit outside the binary group's orbit? If Sanghelios was slap bang in the middle, then that is a lot of solar energy it would be getting, especially when passing between the two star groups. I think they would have to be quite far from their centre sun, both for long term stability of their orbits and habitability, though I am no expert.

There was a post on Halopedia about this. Urs is described as being a primary, so like that guy says, Sanghelios probably orbits Urs at either a distance along with the other two (That are a close Binary) or the close Binary are at the center and Sanghelios tags along with Urs as it orbits the Binary.

  • 01.06.2012 11:56 AM PDT


Posted by: anton1792
Well, I don't think the days would be any longer than ours. If a planet rotates too slowly, then I think one side gets baked by the sun due to the long exposure times, whilst the other side plummets. Think about how hot it gets in the hours between midnight and 3pm on a summers day, and then double that for 42 hour days, etc. Same with freezing conditions.

As for Sanghelios' position in that pic, would it not be more likely that the planets orbit outside the binary group's orbit? If Sanghelios was slap bang in the middle, then that is a lot of solar energy it would be getting, especially when passing between the two star groups. I think they would have to be quite far from their centre sun, both for long term stability of their orbits and habitability, though I am no expert.

There was a post on Halopedia about this. Urs is described as being a primary, so like that guy says, Sanghelios probably orbits Urs at either a distance along with the other two (That are a close Binary) or the close Binary are at the center and Sanghelios tags along with Urs as it orbits the Binary.

You're probably right about the day/night cycle. It seems right totally. I've made some calulations (cool word for drawing some -blam!- :P), and I came to the conclusion that half the time of the year, both suns are up at different times (in fact, sometimes even with no night at all). But there's also the opposite way, with total night almost 40% of the time, which comes with all three suns shining on the surface the whole day. Anyway, I haven't included the possibility of a tilted axis and that Urs rotates Fied and Joori, or vice versa.

Quoted from the halopedia articles about Fied:

Fied is one of three stars in the ternary Urs system. It orbits the primary star Urs along with the star Joori and at least four planets, which include the Sangheili homeworld Sanghelios.

It might just be my weird way of reading or some -blam!-, but to me, it seems like that this line suggests that Fied orbits Urs together with Joori with the four planets, but it can't be true, as it would be too unstable to orbit them.

The three stars could also share a center of mass somewhere inbetween them, but that doesn't really seem stable for any planets rotating Urs, so i trashed that one. To me, it seems more likely for Fied and Joori to be the center stars. I might be wrong, as there's real examples that support both theories. I checked my writings again if the different theories affected it, and they don't, feeding my happiness =D (it took an hour to make them). I also have to check on the moons and double check any information on the time of the orbits.

Anyway, thanks a lot for your answer, it helped me a lot.

  • 01.06.2012 12:50 PM PDT
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"but you already knew that, I mean, how couldn't you?

Only when no Human brick is left atop another, shall we be satisfied with your destruction.

Remember, gravity affects both masses in a system equally, so while the biggest star may be the 'Primary', with the other smaller ones orbiting around it, their actual orbits will describe a path around the centre of mass of the whole trinary system.

Similarly, the planets in-system will orbit the centre of mass of the trinary system (to first approximation anyway).

Trinary systems are very unlikely to have habitable planets around them, because temperature changes in the life belt will be extreme, but we'll ignore that for now.

  • 01.06.2012 6:34 PM PDT

I see what you mean, and I know that they don't orbit Urs, or that Urs doesn't orbit Fied and Joori, but a point which the central star/stars orbits themselves. That leads us to the conclusion that the stars/stars that orbits the central star/stars are much smaller. But not too small either, as the temperature changes from -5 degrees to 95 degrees.

  • 01.07.2012 4:15 AM PDT
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"but you already knew that, I mean, how couldn't you?

Only when no Human brick is left atop another, shall we be satisfied with your destruction.

Don't get too hung up on the definition of 'Primary' in this case, it just means Urs is biggest.

I don't think the way they orbit has ever been specified, it could be a binary pair with a smaller satellite star orbiting their barycentre, a large cetral star orbited by a binary pair, a complex three way orbit around a mutual barycentre...

There are lots of options, I wouldn't go into that much detail in a fanfic to be honest. While I appreciate you want to get it right, your readers will probably be just fine with it if you drop a mention of a triple-sunrise somwhere along the way, or at sometime during the day make mention of the third sun rising in the east.

  • 01.07.2012 7:43 AM PDT

Wrong account oopsie daisies.

[Edited on 01.07.2012 11:13 AM PST]

  • 01.07.2012 11:13 AM PDT

Well, I haven't found anything on the matter, so I have to be creative and logical. I doubt it could be three way orbit, because that seems too unstable. Might just be how I look at things though.

Also, I'm not doing this solely because i want it to be right, I primarily do it because it's fun, and I'm also driven by myself to have it in a way that contradicts reality. Thanks a lot for the help, anyway! I'm really grateful.

  • 01.07.2012 11:14 AM PDT