Posts by Sirius_Alpha

by Sirius_Alpha
03.10.2020, 04:33
Forum: Add-on releases
Topic: Extrasolar Planets (updated catalogue)
Replies: 83
Views: 65701

Re: Extrasolar Planets (updated catalogue)

TESS Sector 27 and 28 planets are out, as well as new planet candidates from Sectors 14-26. TESS has now detected over 3,000 planets and planet candidates. Additionally, with the addition of a few remaining systems, the extrasolar planet catalogue addon now contains all known transiting brown dwarfs...
by Sirius_Alpha
15.09.2020, 20:24
Forum: Add-on releases
Topic: Extrasolar Planets (updated catalogue)
Replies: 83
Views: 65701

Re: Extrasolar Planets (updated catalogue)

I've seen other problem, lot of gas giants that are class 2 appear as class 1 or 3 Planet temperatures are calculated by the following. // Get sudarsky class + albedo. double L_star = CalculateLuminosity(); for (int i = 0; i < PlanetList.Count; i++) { // Determine planet equilibrium temperature. Pl...
by Sirius_Alpha
02.09.2020, 00:53
Forum: Add-on releases
Topic: Extrasolar Planets (updated catalogue)
Replies: 83
Views: 65701

Re: Extrasolar Planets (updated catalogue)

TESS Sector 26 planets are out! I've improved the programme I use for this to be able to calculate Mean Anomaly for celestial bodies that have a 3D orbit but whose position on it is given as a position-angle at a certain epoch. This is sometimes done in literature for systems that have very loose or...
by Sirius_Alpha
23.08.2020, 12:28
Forum: Add-on development
Topic: 200.000.000 star
Replies: 21
Views: 1282

Re: 200.000.000 star

A few months ago I generated a stars.dat file that contained a billion (fictional) stars to see how well it loaded in Celestia. The programme loaded up and when it got to stars.dat it just sat there. Task Manager showed it was taking up more and more memory (no doubt due to loading the .dat file) up...
by Sirius_Alpha
04.08.2020, 00:57
Forum: Add-on development
Topic: Preliminary release of Red Supergiant catalog
Replies: 9
Views: 744

Re: Preliminary release of Red Supergiant catalog

There appear to be a number of stars that lack sourcing information. For a random example, HD 45829. Do you intend to include these for the final version?
by Sirius_Alpha
02.08.2020, 21:39
Forum: Add-on releases
Topic: Extrasolar Planets (updated catalogue)
Replies: 83
Views: 65701

Re: Extrasolar Planets (updated catalogue)

TESS Sector 25 planets are out! Many planetary systems discovered by radial velocity feature giant planets in eccentric orbits. With the HST astrometric results for Ups And showing a significantly misaligned system, I have suspected that many of these eccentric multi-planet systems from RV would end...
by Sirius_Alpha
08.07.2020, 18:18
Forum: Celestia Users
Topic: Pictures from Celestia
Replies: 383
Views: 75538

Re: Pictures from Celestia

A gravity-darkening experiment using cloud maps.
WASP-33A.png
WASP-33 A and it's misaligned hot Jupiter
by Sirius_Alpha
02.07.2020, 01:15
Forum: Add-on releases
Topic: Extrasolar Planets (updated catalogue)
Replies: 83
Views: 65701

Re: Extrasolar Planets (updated catalogue)

TESS Sector 24 planets are out! Additionally, new TESS Sector 10 and 11 planet candidates have also been released "after a recent review of the initial vetting for those sectors." Among the more interesting results is that at least two of the super-earths orbiting the nearby, bright star N...
by Sirius_Alpha
03.06.2020, 04:51
Forum: Add-on releases
Topic: Extrasolar Planets (updated catalogue)
Replies: 83
Views: 65701

Re: Extrasolar Planets (updated catalogue)

My apologies for the delay. TESS Sector 23 planets are out! The NASA Exoplanet Archive's unconfirmed Kepler KOI list is a rather interesting place where, as far as I can tell, model-fitting throws bayesian priors to the wind and χ^2 minimization is the rule. "Does a sixteen solar-radius planet ...
by Sirius_Alpha
31.05.2020, 18:56
Forum: Add-on releases
Topic: A Hot Jupiter Experiment
Replies: 7
Views: 742

A Hot Jupiter Experiment

I've always felt that everyone's favourite kind of planet could be rendered in a more realistic way. Certainly in my mind's eye hot Jupiters have an appearance that makes them appear to be very warm places, very close to the star. Celestia has a number of limitations to rendering them the way I imag...
by Sirius_Alpha
08.05.2020, 22:44
Forum: Celestia Users
Topic: Back from the dead!
Replies: 6
Views: 556

Re: Back from the dead!

I am very happy to see you have returned!
by Sirius_Alpha
01.05.2020, 01:36
Forum: Add-on releases
Topic: Extrasolar Planets (updated catalogue)
Replies: 83
Views: 65701

Re: Extrasolar Planets (updated catalogue)

TESS Sector 22 planet candidates are out! Appreciations again to all the people who pointed out errors! PDS70.png 01 May 2020 - 27 TESS candidate planets added (TOI-1794 through TOI-1824). - 21 TESS candidate planets have been determined to be false positives since the last update and excluded. - Ad...
by Sirius_Alpha
03.04.2020, 04:04
Forum: Add-on releases
Topic: Extrasolar Planets (updated catalogue)
Replies: 83
Views: 65701

Re: Extrasolar Planets (updated catalogue)

Thanks for that! Do you have a better orbit I can use?
by Sirius_Alpha
02.04.2020, 03:43
Forum: Add-on development
Topic: Poll: Exoplanet Catalogue planet ordering
Replies: 14
Views: 1058

Re: Poll: Exoplanet Catalogue planet ordering

Well, the results of the poll are unambiguous to say the least. The .ssc order of the planets has been changed as of the April 2020 version of the exoplanet catalogue.
by Sirius_Alpha
02.04.2020, 03:39
Forum: Add-on releases
Topic: Extrasolar Planets (updated catalogue)
Replies: 83
Views: 65701

Re: Extrasolar Planets (updated catalogue)

TESS Sector 21 planet candidates are out! Otherwise not a lot from TESS this time. Perhaps it's related to the current global situation. A huge thank-you to SevenSpheres , LukeCEL , Fafers_br and pedro_jg for identifying problems that have been fixed and new information that has been implemented. Tw...
by Sirius_Alpha
28.03.2020, 19:21
Forum: Utilities
Topic: A humble tool for creating Celestia systems
Replies: 8
Views: 1288

Re: A humble tool for creating Celestia systems

Some improvements: 1. For single-transit planets (as are a frequent case for some TESS planet candidates), we sometimes do not have an orbital period or semi-major axis. But we do have a transit duration. You may now use "Transit_Dur" to specify a transit duration, which will then be used ...
by Sirius_Alpha
22.03.2020, 18:19
Forum: Utilities
Topic: A humble tool for creating Celestia systems
Replies: 8
Views: 1288

Re: A humble tool for creating Celestia systems

Feedback and FAQ's.

Can you make this open source?
Sure!
CelestiaWriterSource.rar
(496.36 KiB) Downloaded 59 times
by Sirius_Alpha
22.03.2020, 17:55
Forum: Utilities
Topic: A humble tool for creating Celestia systems
Replies: 8
Views: 1288

A humble tool for creating Celestia systems

Over about the past year I have been developing a programme to create an updated catalogue of extrasolar planets, here . I have been continuously improving over the past year, but its structure was very limited and cumbersome, like a cathedral built without a plan, and only as a result of continuous...
by Sirius_Alpha
17.03.2020, 20:29
Forum: Celestia Users
Topic: Pictures from Celestia
Replies: 383
Views: 75538

Re: Pictures from Celestia

MrSpace43 wrote:I know that Kepler-62 was a K-type star. I took Kepler-62 from Sirius_Alpha's exoplanet catalog, in which he incorrectly made the star a G-type.
LukeCEL wrote:We agreed that the majority of the data seem to show that the spectral type should be K, not G.
Yeah it will be a K-type star in the April release.
by Sirius_Alpha
16.03.2020, 03:09
Forum: Ideas & News
Topic: What should go in revised.stc?
Replies: 12
Views: 950

Re: What should go in revised.stc?

Because it isn't assembled from a uniform data source, and hopefully many of its contents would be in a newly assembled Gaia+Hipparcos stars.dat file at some point in the future. Clearly we are not currently at the point where dumping nearstars.stc is feasible (lest we lose α Cen as a binary system)...

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