Celestia Forums

ajtribick wrote:I am sitting here going "mwahahaahaaa I am going to set a bunch of stars to O-type to mess with Fafers-br."

I appreciate your sense of humor as much as I appreciate your efforts in making this addon. Thank you for both.

Hi ajtribick. After installing the v1.0.1, I noticed very suspicious "blue stellar patches" in the Galaxy when setting the magnitude limit to 15.2. To my surprise, I determined that this new version created a large number of stars with spectral type "O". Was this intentional like...

Wow! Very clever.

Hi Joey.
I found this one. Hope it helps.

And here is an interesting reading about Neptune's discovery, from where I took the link above.

I couldn't find inclination and ascending nodes data. I used Neptune's ones to achieve the orbits below.

Bye.

Great job LukeCel.
And thanks for the kind citation.

I found two papers on the structure of the LMC. The one I found most "didatic" was Koerwer 2009 . It provides a good 3D schematics in figure 6. The other is Subramanian 2013 . Both seem to agree that 30 Dor is slightly behind the plane of the disc of LMC. Refer to section 5 from first sour...

As an exercise of pure imagination, if we could abandon the scientific rigour for a while... We could fix the value of Rv=3.1. Then, for the same Schulte 16 given as example above. From Earth: d'=d=1514.6pc The declared value for Av would be 4.5. Then: Avpc=Av/d'=0.02971mag/pc. So: E(B-V)=d'*Avpc/Rv...

Have you thought of a good way to add interstellar reddening as well? As we know, stars appear not just dimmer, but redder when obscured by dust because the dust preferentially scatters blue light. I think reddening is more complicated. Well, even my suggestion for extinction is already naively con...

Hello there! As everybody knows, Celestia does not take visual extinction (Av) in consideration in its calculations. This has some consequences, and one of them is the underestimation of the AbsMag and, hence, the calculation of the stars' radius when using the black body aproximation. I'd like to p...

The tree displayed in the solar system browser, with the star on the top and the planets below, also gives the "feeling" of increasing distance from the star as you go down the planet list. So, it's one more reason in favor of the distance order. As long as the order of discovery date is r...

It is a great work indeed, ajtribick.
Congratulations and thank you for that!

Hi Jujuapapa! Try this: Barycenter "Star_A" { RA 180.0000 Dec 20.0000 Distance 200.0 #Inclination -20.0000 } # # Star B # "Star B" { OrbitBarycenter "Star_A" SpectralType "G1V" AbsMag 4.67 EllipticalOrbit { Period 1000 SemiMajorAxis 100 Eccentricity 0.01 Incli...

Hi Jujuapapa. This is strange. In my Celestia the code I sent resulted in the figure bellow when viewing from the Sun: celestia_Inclination for a barycenter.jpg The orbits are aligned and it's an eclipsing system. Of course, you'd have to change the orbital parameters of the rest of the system to ma...

Hi jujuapapa. I think what you want is basically a system inclined 90º relative to the plane-of-sky. I recommend you use Grant Hutchison's starorbs spreadsheet for Celestia. Here's the code using your data in Grant Hutchison's spreadsheet, supposing that the AscendingNode you provided is relative to...

No objections. I see you are propposing the temperatures from E. Mamajek's table. I think it's a good source.

If I can find some rotation rate relations for planet's mass vs age, that's what I'd like to do. I've considered just extrapolating downward from the brown dwarf regime -- something that should be somewhat well characterized, but I haven't managed to find some decent research on it since I haven't ...

The issue arises in the way Celestia calculates the "distance." For a planet, the distance is between the observer and the surface, whereas for a star, it is defined with respect to the centre of the star. If you "land" on the star's surface, you'll note you will have quite some...

Talking about object comparison, and apologizing for drifting a little offtopic, this topic reminded me of an issue I observed in my Celestia 1.6.0 (Yes, I know...). Once upon a time, in a not so far away galaxy, I had the idea of making a comparison of object sizes putting them side by side in a ve...

City included in my profile.

(...)the barycenters do not show up in the Stars List when set to "planets with stars." Apparently it was the developers' choice not to show barycenters in the Star Browser (if you mark the option "nearest", they will not show up too). But their planetary companions are correctl...