Posted: 05.11.2019, 05:25
According to Sirius_Alpha there's a paper somewhere that effectively deconfirmed Dagon and characterized it as some dust cloud or smth.
Real-time 3D visualization of space
SevenSpheres wrote:Why isn't Fomalhaut b included? It should at least be in Exoplanets_Unconfirmed.ssc.
Concerning the visible-light point source, its underlying physics is unclear, but the only hypothesis that can be shown to reasonably fit all existing data is an optically thin dust cloud, which is transient or has a transient component. If this interpretation is valid, the cloud may or may not be physically bound to a central object in the super-Earth mass regime.
The relatively high collision rate that we calculate here would mean that another Fom b-like object should appear within the next decade, and Fom b itself will fade over the coming years, possibly becoming resolved. In order to test these two predictions, continued follow-up observations capable of detecting objects as faint as Fom b are vital. For now, the only telescope capable of detecting Fom b is Hubble, but the upcoming James Webb Space Telescope will be able to resolve the dust cloud, and provide some additional constraints on the dust composition with near IR measurements.
Also, non tidally locked planets are defined with unrealistically long rotation periods. (This is great work otherwise!)
And that is why I don't use Wikipedia as a source for this.SevenSpheres wrote:So the Wikipedia article is incorrect then? Someone should fix it...
Yeah! I have looked for it but haven't found it. I might be able to recover the relation from the rotation periods given in that .ssc file though.SevenSpheres wrote:The 2013 extrasolar.ssc file uses tidal spin-down formulas from a book called "Solar System Dynamics" by CD Murray & SF Dermott. If you can get that book you could potentially use those formulas, taking the system's age into account where known.
Sirius_Alpha wrote: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 kept track of brown dwarf research. For terrestrial planets, the various stochastic processes that lead to their formation give them fairly randomized rotation rates, so the only systematic is the influence of tides. This might be worth pursuing -- i.e., planets that are still reaching tidal equilibrium being represented in some sort of intermediate rotation regime. But since the initial rotation rate is random, how do you calculate this?
LukeCEL wrote:where are the sources for the binary star definitions? I noticed that systems like 11 Com have a full definition including all the parameters, but I can't find any reference to those orbital elements. Apologies if this was mentioned somewhere else and I haven't noticed it.
This is a most useless feature that could have been make. I deleted it in the very first versions of CO.LukeCEL wrote:Sirius_Alpha: do you plan on doing "limit of knowledge" AltSurface definitions for all the planets? It's a thing that's in the original exoplanet files.
I have thought about it, along with creating a companion addon with textures for extrasolar planets (based on longitudinally-resolved maps from phase curve data). But ultimately I don't know a lot about creating textures so this has been only a vague idea.LukCEL wrote:Sirius_Alpha: do you plan on doing "limit of knowledge" AltSurface definitions for all the planets? It's a thing that's in the original exoplanet files.
That's how my main Celestia install is set up...Art Bloss wrote:All the same, that all unexplored asteroids would be in the form of gray smooth balls.
Yeah there shouldn't be any conflict between the two. It's based off the TYC catalogue, and any stars in this addon that have TYC ID's have the overwrite prefix to prevent duplicates.@sirius_alpha : is it ok if I use your latest file and the ajtribrick' gaia_stars_catalog ?