Posts by LukeCEL

by LukeCEL
11.11.2020, 22:16
Forum: Utilities
Topic: Utilities 2017
Replies: 12
Views: 4403

Re: Utilities 2017

A while ago I compiled the cmodview utility on my computer. I'm not sure if it'll work on macOS Catalina, but I'll post it here.
by LukeCEL
26.10.2020, 16:14
Forum: Add-on development
Topic: Elliptical and Lenticular Galaxies: An Experiment
Replies: 9
Views: 1639

Re: Elliptical and Lenticular Galaxies: An Experiment

it would be better if luke showed you how to change colors and brighten it so you get get it brighter and a creamy white as in the pic of the real thing The colors are derived from color indices from two papers ( Buta et al. (1994) and Buta et al. (1995) ); I transformed them using FarGetaNik's col...
by LukeCEL
21.10.2020, 19:57
Forum: Add-on development
Topic: Request WD 1586 and its planet WD 1586 b
Replies: 7
Views: 496

Re: Request WD 1586 and its planet WD 1586 b

That great resource has WD 1856 b, not WD 1586 b. I know they are easy to mix up 1856......1586.... You're right, they're easy to mix up... I even wrote 1586 in my own post. :insane: But it looks like the article https://gadgets.ndtv.com/science/news/exoplanet-wd-1586b-discovered-nasa-tess-2296737 ...
by LukeCEL
20.10.2020, 21:04
Forum: Add-on development
Topic: Request WD 1586 and its planet WD 1586 b
Replies: 7
Views: 496

Re: Request WD 1586 and its planet WD 1586 b

I would recommend Sirius_Alpha's exoplanet catalogue. It has all known exoplanets and is updated monthly, and it has WD 1586 b.
by LukeCEL
17.10.2020, 19:54
Forum: Add-on releases
Topic: Updated Binary Star Catalogue
Replies: 1
Views: 465

Re: Updated Binary Star Catalogue

Here's a small update to this file - it adds a few missing TYC and HD designations not present in the earlier file.
by LukeCEL
14.10.2020, 22:06
Forum: Add-on releases
Topic: Updated Binary Star Catalogue
Replies: 1
Views: 465

Updated Binary Star Catalogue

Hi everyone, A while ago on the Motherlode, I uploaded a catalogue of binary or multiple stars in Celestia, replacing 130 or so stars (with Bayer or Flamsteed designations) with binary systems using available data. Unfortunately, at the time of writing the Motherlode is still not functional, so I ca...
by LukeCEL
09.09.2020, 02:39
Forum: Add-on releases
Topic: Extrasolar, Stars and Exoplanets for Celestia
Replies: 87
Views: 71252

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: 344

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: 71252

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: 18316

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: 996

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: 618

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: 4324

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: 18316

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: 18316

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: 13
Views: 1157

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: 71252

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: 71252

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: 1439

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: 4324

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...

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