Posts by LukeCEL

by LukeCEL
Today, 01:21
Forum: Add-on releases
Topic: Extrasolar, Stars and Exoplanets for Celestia
Replies: 55
Views: 64129

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: 24
Views: 1445

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: 7204

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: 24
Views: 1445

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: 671

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: 24
Views: 1445

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...
by LukeCEL
04.07.2020, 03:18
Forum: Add-on development
Topic: Nebulae in Celestia using sprites
Replies: 24
Views: 1445

Re: Nebulae in Celestia using sprites

Abell 7 Abell 7 is the first planetary nebula in the Abell catalogue to show relatively complex features. These features are only visible in extremely long-exposure shots, such as this one by Don Goldman. That is the image that I based my model on. These complex features cannot be easily made using...
by LukeCEL
03.07.2020, 16:33
Forum: Development
Topic: Celestia 1.7.0 Development Thread
Replies: 914
Views: 194124

Re: Celestia 1.7.0 Development Thread

Thoughts: to retain backwards compatibility, would it be better to organize it like this: const char* WhiteDwarfSubclassNames[13] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "", &q...
by LukeCEL
27.06.2020, 18:23
Forum: Celestia Users
Topic: Pictures from Celestia
Replies: 344
Views: 60018

Re: Pictures from Celestia

jujuapapa wrote:Or you think that celestia gave wrong datas since several years???

Actually, yes. Look at Venus, for example.

Venustemp.png
by LukeCEL
25.06.2020, 19:09
Forum: Add-on development
Topic: Nebulae in Celestia using sprites
Replies: 24
Views: 1445

Re: Nebulae in Celestia using sprites

Abell 6 Abell 6 is an extremely faint nebula. In general this is true of all planetary nebulae, so these models are way brighter than in reality. To the unaided eye, they would probably be completely invisible. That being said, looking at photographs we can get a basic idea of what Abell 6 looks li...
by LukeCEL
24.06.2020, 18:52
Forum: Add-on development
Topic: Nebulae in Celestia using sprites
Replies: 24
Views: 1445

Re: Nebulae in Celestia using sprites

Abell 2 Abell 2 is poorly studied, and only has very low-resolution photos taken of it, such as this one . Therefore, I tried my best to make a model consistent with the features visible. To "fill up" the space of the nebula, I generated points with random x-, y-, and z-coordinates and re...
by LukeCEL
23.06.2020, 15:59
Forum: Add-on releases
Topic: MrSpace43's Exoplanet Addons
Replies: 10
Views: 574

Re: MrSpace43's Exoplanet Addons

jujuapapa wrote:Why kepler-62's star is unknown on my 1.6.2 ?

You have to use Sirius_Alpha's exoplanet catalogue as a base: viewtopic.php?f=23&t=18705
by LukeCEL
23.06.2020, 01:33
Forum: Add-on releases
Topic: Extrasolar, Stars and Exoplanets for Celestia
Replies: 55
Views: 64129

Re: Extrasolar, Stars and Exoplanets for Celestia

We're getting more papers about HR 6819.

https://arxiv.org/abs/2006.11974 - This paper suggests a similar model to the one mentioned above.

https://arxiv.org/abs/2006.11872 - This paper suggests that HR 6819 is a black hole binary, but the Be star is actually a chance alignment.
by LukeCEL
22.06.2020, 03:48
Forum: Add-on releases
Topic: Extrasolar, Stars and Exoplanets for Celestia
Replies: 55
Views: 64129

Re: Extrasolar, Stars and Exoplanets for Celestia

Regarding the QV Tel/HR 6819 system: another recent study found an alternative explanation that invokes only two stars (and no black hole).

https://arxiv.org/abs/2006.10770
by LukeCEL
18.06.2020, 20:10
Forum: Add-on releases
Topic: Populating WLM (and other galaxies) with REAL stars
Replies: 102
Views: 12592

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

This add-on adds about 860 stars in IC 10 . It is the nearest starburst galaxy, so there are a lot of Wolf–Rayet stars in this one. There is also a high-mass X-ray binary (IC 10 X-1), with one of the highest-mass black holes known. You're welcome to add accretion disks or something, if you want. The...
by LukeCEL
14.06.2020, 23:26
Forum: Add-on releases
Topic: Populating WLM (and other galaxies) with REAL stars
Replies: 102
Views: 12592

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

After some renewed attention, it looks like the Triangulum stars add-on is in need of a few tweaks! Specifically: 1. The brightness of Mira-type stars is way over the place, causing some of them to be as small as ~20 solar radii. I've bumped up the brightness on those. 2. Other stars, namely red sup...
by LukeCEL
10.06.2020, 22:25
Forum: Help Central
Topic: Anybody besides me tired of constant captchas getting here?
Replies: 37
Views: 1105

Re: Anybody besides me tired of constant captchas getting here?

For me I rarely get captchas. However, when I go to https://celestia.space/forum/, often Cloudflare doesn't let me in the first time, but seems to "reload" again and again.
by LukeCEL
10.06.2020, 16:50
Forum: Add-on development
Topic: Nebulae in Celestia using sprites
Replies: 24
Views: 1445

Re: Nebulae in Celestia using sprites

MyCn 18 (Etched Hourglass Nebula) I'm releasing another bipolar nebula today. I'm using the same method as mentioned above. However, I didn't use an equation for the curve; instead, I traced out the density map from Vincent Icke's simulation of MyCn 18. All the resources (the GeoGebra file, the Per...
by LukeCEL
07.06.2020, 17:40
Forum: Celestia Users
Topic: Pictures from Celestia
Replies: 344
Views: 60018

Re: Pictures from Celestia

Some galaxy clusters rendered using these elliptical/lenticular galaxy models. Unfortunately I'd say they're not suitable for Celestia because of lag, but they still look pretty I guess.

Virgo Cluster:
VirgoCluster.png


Coma Cluster:
ComaCluster.png


Fornax Cluster:
FornaxCluster.png
by LukeCEL
07.06.2020, 17:14
Forum: Add-on development
Topic: Elliptical and Lenticular Galaxies: An Experiment
Replies: 4
Views: 412

Re: Elliptical and Lenticular Galaxies: An Experiment

Here's an "add-on", I guess. Below are files that replaces all the elliptical and lenticular galaxies in Celestia with an elliptical galaxy model. To install, replace the old "galaxies.dsc" file with the new one (keep a backup of the old one!), move the file "blank.png"...

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