Posts by LukeCEL

by LukeCEL
09.09.2020, 02:39
Forum: Add-on releases
Topic: Extrasolar, Stars and Exoplanets for Celestia
Replies: 87
Views: 68588

Re: Extrasolar, Stars and Exoplanets for Celestia

Here's a recently-discovered triple star system. TIC 278825952 consists of three stars, two of which are similar and on a tight, nearly circular orbit, and the third, which is on an unusually circular orbit around the two. Parameters from Mitnyan et al. (2020) . Barycenter "TIC 278825952" ...
by LukeCEL
31.08.2020, 16:23
Forum: Help Central
Topic: I'll need some help with the globular clusters
Replies: 4
Views: 181

Re: I'll need some help with the globular clusters

Hi Spaceman ! I tried your DSC code and it worked for me. MagniCluster.png The only "wrong" with your DSC file is that the RA is too high - for DSC files the RA is in fractional hours, not degrees, so it goes from 0 to 24. However, the globular will still work, it'll just be placed in an u...
by LukeCEL
18.08.2020, 01:15
Forum: Add-on releases
Topic: Extrasolar, Stars and Exoplanets for Celestia
Replies: 87
Views: 68588

Re: Extrasolar, Stars and Exoplanets for Celestia

Here's a very low-mass eclipsing binary. NGTS J0930-18 has an M0V star and a companion just above the hydrogen-burning limit. Parameters from Acton et al. (2020) . Barycenter "NGTS J0930-18" { RA 142.56666667 Dec -18.84267222 Distance 742.614 } "NGTS J0930-18 A" { OrbitBarycenter...
by LukeCEL
14.08.2020, 01:26
Forum: Add-on releases
Topic: Populating WLM (and other galaxies) with REAL stars
Replies: 82
Views: 16197

Re: Populating WLM (and other galaxies) with REAL stars

Here is an update to the Draco Dwarf add-on. The main change is a new orbital definition for the symbiotic star [ALS82] C1, also known as Draco C1. The parameters come from Lewis et al. (2020): "Geometry of the Draco C1 Symbiotic Binary".
by LukeCEL
06.08.2020, 21:10
Forum: Add-on development
Topic: Preliminary release of Red Supergiant catalog
Replies: 9
Views: 593

Re: Preliminary release of Red Supergiant catalog

nussun wrote:I'm not sure what you mean

Basically citing the sources you used for the catalog.
by LukeCEL
06.08.2020, 20:28
Forum: Add-on releases
Topic: star-binary
Replies: 5
Views: 370

Re: star-binary

Hi, what source(s) did you use for all the binary orbits?
by LukeCEL
01.08.2020, 16:34
Forum: Add-on development
Topic: Nebulae in Celestia using sprites
Replies: 34
Views: 3016

Re: Nebulae in Celestia using sprites

GK Per (Firework Nebula) GK Per has a very unique appearance, as its nova outburst in 1901 ejected a lot of mass. This mass is visible to us as numerous streaks of red, which I believe is H-alpha emission. Anyway, if you look at a picture of GK Persei, you can see how the nickname "Firework Ne...
by LukeCEL
26.07.2020, 19:23
Forum: Add-on releases
Topic: Populating WLM (and other galaxies) with REAL stars
Replies: 82
Views: 16197

Re: Populating WLM (and other galaxies) with REAL stars

This add-on adds over 190 stars to the Ursa Minor Dwarf Galaxy . Despite having over a thousand listed children in SIMBAD, I excluded most of them because they had an average membership probability under 90%. That being said, the leftover stars had a relatively large amount of photometric data, whic...
by LukeCEL
22.07.2020, 17:31
Forum: Add-on releases
Topic: Populating WLM (and other galaxies) with REAL stars
Replies: 82
Views: 16197

Re: Populating WLM (and other galaxies) with REAL stars

I've gone around and fixed a few of my add-ons. M 33 / Triangulum Galaxy: The problematic system here was M33SSS J013300.38+303416.8. It is listed as a Mira variable, but the V-magnitude from SIMBAD makes it unrealistically bright, and thus, large. I've changed the spectral type from "MIII"...
by LukeCEL
21.07.2020, 15:51
Forum: Add-on development
Topic: Northern System
Replies: 12
Views: 784

Re: Northern System

The Minmus Derp wrote:Thank you! hold up how do you quote?

Simply select the text you want to quote. In the top right, a box with a quotation mark will appear. Then just click the box.

howtoquote.png
by LukeCEL
21.07.2020, 15:47
Forum: Add-on releases
Topic: Extrasolar, Stars and Exoplanets for Celestia
Replies: 87
Views: 68588

Re: Extrasolar, Stars and Exoplanets for Celestia

Question: How can an orange subgiant have such a low mass? I would expect it to have a mass of between 0.6 and 2 MSol. How did it lose so much mass? Even though the secondary star has the appropriate temperature and radius, I wouldn't really call it a "subgiant"; that's mainly for Celesti...
by LukeCEL
21.07.2020, 01:36
Forum: Add-on releases
Topic: Extrasolar, Stars and Exoplanets for Celestia
Replies: 87
Views: 68588

Re: Extrasolar, Stars and Exoplanets for Celestia

Here is KIC 12268220, an eclipsing binary. It looks a bit unusual, because the secondary star has a very low mass (about 0.23 Msol) while being quite large (over 3 Rsol). The paper mentioned several other similar systems, apparently the prototype is R CMa. Parameters from Cui et al. (2020) . Barycen...
by LukeCEL
15.07.2020, 17:30
Forum: Utilities
Topic: A humble tool for creating Celestia systems
Replies: 8
Views: 1189

Re: A humble tool for creating Celestia systems

Yes, but the bigger problem is that these are Windows executables (and do not work for macOS).
by LukeCEL
14.07.2020, 21:22
Forum: Add-on development
Topic: Nebulae in Celestia using sprites
Replies: 34
Views: 3016

Re: Nebulae in Celestia using sprites

Kepler-1520 b (KIC 12557548 b) A few exoplanets are known to have dust tails around them, because the planets' surfaces are literally evaporating away. KIC 12557548 b, now designated Kepler-1520 b, was the first known example of this. These tails are actually pretty hard to model, even for professi...
by LukeCEL
13.07.2020, 01:21
Forum: Add-on releases
Topic: Extrasolar, Stars and Exoplanets for Celestia
Replies: 87
Views: 68588

Re: Extrasolar, Stars and Exoplanets for Celestia

ZTF J2055+4651, only the second known binary consisting of a hot OB subdwarf and a white dwarf. Parameters from Kupfer et al. (2020) . Barycenter "ZTF J2055+4651" { RA 313.81658333 Dec 46.85179444 Distance 7502 # 2.3 kpc } "ZTF J2055+4651 A" { OrbitBarycenter "ZTF J2055+4651...
by LukeCEL
11.07.2020, 23:09
Forum: Add-on development
Topic: Nebulae in Celestia using sprites
Replies: 34
Views: 3016

Re: Nebulae in Celestia using sprites

What about the fibonacci sphere? The Fibonacci sphere (posted on Discord, by the way, for those lacking context) was created so I could fill a sphere evenly with points. I will release that once I'm done making final tweaks to it. HD 163296 Sprites can also be used to make protoplanetary disks arou...
by LukeCEL
11.07.2020, 16:31
Forum: Ideas & News
Topic: Rings (disks) around stars?
Replies: 26
Views: 8214

Re: Rings (disks) around stars?

A more recent disk model made by LukeCEL using sprites can be found here. Here's an optimized version of that disk model. Optimized in the sense that it looks the same but has a significantly smaller size. To use it in SSC objects, however, you need to do two things: 1) define it with "Emissiv...
by LukeCEL
09.07.2020, 19:48
Forum: Add-on development
Topic: Nebulae in Celestia using sprites
Replies: 34
Views: 3016

Re: Nebulae in Celestia using sprites

Update: I've optimized the CMOD models by coloring the material definitions instead of the points themselves, when possible. I also tweaked the appearances of some of the models. This means that the files are now slightly lighter than before. All of them are available in the Google Drive link in the...
by LukeCEL
07.07.2020, 16:07
Forum: Announcements
Topic: New site/forum server and adminstrator
Replies: 8
Views: 2014

Re: New site/forum server and adminstrator

Since the Celestia website is now run by onetwothree, I think it's worth bringing this question back up. Could we work on translating the website into more languages? Alexell started an initiative to translate the website here , and we got seven different languages. But after the website was redesig...
by LukeCEL
05.07.2020, 21:55
Forum: Add-on development
Topic: Nebulae in Celestia using sprites
Replies: 34
Views: 3016

Re: Nebulae in Celestia using sprites

A note about color. In astronomy, color is quite complicated. You can't just take many of the famous Hubble photos at face value, because they're false-color. This isn't because astronomers are trying to trick you - it's because using different filters and processing can bring out details so they c...

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