Celestia Forums

Well I am wondering now if it is a mix up in some way with Mizar's B component (by that I mean the star you see in a scope, not the very close star that is less than 1AU from Mizar, no way could we see that!) which at a separation of 14" would make them 500 AU apart. Although I have the close s...

Yes I do have that as well Grant, thanks for spotting it! I am guessing that this is a small error then? Mystery solved, though I still wonder how it came to be.

Many thanks Grant, I have been pretty puzzled by this additional star.

That is wonderful argelesmer , thank you kindly for taking the time and effort to produce that, Alcor now has the correct Red Companion! This does of course still leave the puzzle as to what exactly TYC 4242-6717-0 is doing in Celestia, it does not exist in SIMBAD, It does not exist in my eyepiece, ...

Thanks for your reply Argelesmer, I think the point I was making was that TYC 4242-6717-0 seems to be a spurious star, as if it existed, though it may not be a true companion to Alcor, it would at least be classed as a double star and would be visible in a telescope, unless the distance between the ...

In Celestia 1.6.1 Alcor has a companion star, listed as TYC 4242-6717-0 almost but not quite identical to Alcor, yet I can find no reference to this star anywhere, in fact Alcor does have a companion , but it's a red dwarf, so where did this A type twin pop up from, is it an error in the Tycho catal...

Thanks Andrew, (I had figured that one out )

Wow! I made the stc and the result is fantastic! many thanks Andrew, I am very grateful. I do note that both sets of stars are now displayed, is there a simple way to cancel the original stars? Also to Fridger too for his input and explanaitions. I understand a lot better now why things are as they ...

Hi Fridger, We must have posted at virtually the same instant Currently reading and trying to grasp the significance of the various posts and links etc in that thread. I very much appreciate your advanced understanding of the subject as I am heving to read and re-read this stuff several times over t...

Thanks for the clarifications there Selden, I understand better now how the program is working. As many of my observations include double stars I was particularly interested to them in the 3D environment of Celestia, in some cases this is possible, but I understand better now why many seem to be "Mi...

See this thread for some discussion of this system. The situation does not seem to be as clear-cut as some popular sources make out. Interesting, thanks for the link. The image on the site I posted though seems to show the two seperated components as being fairly equal in mv, at least not so widely...

Is the model in Celestia accurate? It shows component A as a large G8III type star of 18 Rsun but the B component is only 1.2 Rsun, and the seperation is at 1.4 AU. Burnhams has these stars much closer physically (70 million Miles) and much closer in size to each other, although the spectral classes...