Posts by ajtribick

by ajtribick
06.05.2020, 18:33
Forum: Help Central
Topic: startextdump doesn't output spherical coordinates
Replies: 10
Views: 336

Re: startextdump doesn't output spherical coordinates

makestardb looks ok.
makexindex has the same issue.
by ajtribick
05.05.2020, 20:54
Forum: Help Central
Topic: startextdump doesn't output spherical coordinates
Replies: 10
Views: 336

Re: startextdump doesn't output spherical coordinates

Interesting... looking at the code I see what's going on: the ofstream is created on the heap via operator new and it is not deleted at the end of the program. So the ofstream destructor doesn't get called and the stream doesn't get flushed. There are no explicit calls to flush the stream either. Th...
by ajtribick
03.04.2020, 16:44
Forum: Add-on releases
Topic: Extrasolar Planets (updated catalogue)
Replies: 64
Views: 58255

Re: Extrasolar Planets (updated catalogue)

Thanks for that! Do you have a better orbit I can use? Unfortunately I'm not aware of any. Given the length of the orbit I'd guess most solutions would be highly approximate anyway. I see that the paper which provided the orbit is cited here with a rather different (but also implausible!) value of ...
by ajtribick
02.04.2020, 18:47
Forum: Add-on releases
Topic: Extrasolar Planets (updated catalogue)
Replies: 64
Views: 58255

Re: Extrasolar Planets (updated catalogue)

Sirius_Alpha wrote:Updated stellar orbits for 83 Leo, GJ 86 and 16 Cyg using Sixth Orbits Catalogue
I remember running into this for the OEC: the implied total mass of 83 Leo AB from the orbit in the Sixth Catalogue is implausibly low, about 0.4 solar masses.
by ajtribick
31.03.2020, 16:04
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

SIMBAD might help in some cases. I do note that the first star I checked, S Doradus is not listed as a child of the LMC, so it isn't going to remove 100%. SIMBAD might also help with the cross-match issues, although things are complicated by binary and multiple star systems. I've seen multiple cases...
by ajtribick
30.03.2020, 18:04
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

Well this add-on only includes HIP or TYC stars, so it's not going to be very informative about how stars outside these catalogues are represented. To figure out how non-HIP/TYC stars are handled, you need to look at the Celestia source code. The general rules for Celestia IDs, which are represented...
by ajtribick
22.03.2020, 15:28
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

TYC 858-1221-2 is not present in the Gaia tycho2_best_neighbour table on the Gaia archive which I use for the source selection. It's therefore not present in the stars.dat file. The star in question is defined in visualbins.stc, where it is NOT assigned a Tycho number. The issue you report has nothi...
by ajtribick
22.03.2020, 09:27
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

There's no reason why the stars.dat file would prevent modification via the .stc file. "It didn't work" is not useful for diagnosing the issue. We don't know what your .stc file looks like. We don't know what the console log looks like in Celestia, maybe it indicates errors in your file. W...
by ajtribick
07.03.2020, 14:04
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

Having done a few searches on VizieR, I'm not sure there's any reliable source on which TYC stars are extragalactic. It's an interesting problem, for values of "interesting" that mean "don't expect anything in the immediate future". :)
by ajtribick
03.03.2020, 20:44
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

Interesting observation! I think you're probably right. As an example, the LMC B[e] supergiant R126 (TYC 9167-518-1, HD 37974) is assigned a distance of 10.5 kpc in the Gaia geometric distance catalogue, versus a ~50 kpc distance to the LMC. I don't have a Celestia installation to hand as I'm writin...
by ajtribick
01.03.2020, 09:51
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

@Art Blos - I don't have any plans to do any updates on this unless someone finds a sufficiently severe bug, i.e. that something's gone wrong with correctness with respect to the input data. (Correctness with regards to external reality is another matter, which should probably be handled in revised....
by ajtribick
27.02.2020, 22:44
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

Good find. I'm not making individual corrections to the various entries as this would be a lot of work. Presumably these "stars" are missing in Gaia DR2 but because the cross-match is incomplete (even beyond just missing the brightest stars that are too bright for Gaia) I can't rely on the...
by ajtribick
25.02.2020, 23:05
Forum: Help Central
Topic: startextdump doesn't output spherical coordinates
Replies: 10
Views: 336

Re: startextdump doesn't output spherical coordinates

Yes, the function DumpStarDatabase (used for the current star database format) is blissfully unaware of the existence of useSpherical. Once you extract x, y and z from the file, the distance is easy to calculate from the usual Euclidean formula (x²+y²+z²). Extracting the right ascension and declinat...
by ajtribick
25.02.2020, 22:09
Forum: Help Central
Topic: startextdump doesn't output spherical coordinates
Replies: 10
Views: 336

Re: startextdump doesn't output spherical coordinates

Looking at the code, the useSpherical parameter is only passed to DumpOldStarDatabase, which as the name implies only handles the older format. At that time stars.dat contained the HD cross-index and stored coordinates as (right ascension, declination, parallax). I believe the reason for the change ...
by ajtribick
25.02.2020, 18:40
Forum: Add-on releases
Topic: NGTS-10b
Replies: 5
Views: 249

Re: NGTS-10b

Transiting planets like NGTS-10b give you an easy way to check whether or not you've got the orbits correct. Remember, the given orbital elements are usually relative to the sky plane, while Celestia's default is to use orbital elements relative to the ecliptic. In Celestia, go to the solar system, ...
by ajtribick
17.02.2020, 20:56
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

In your database has all HIP/TYC stars? Unfortunately not. The main reason for this are that the cross-matches to Gaia DR2 are incomplete. In the case of HIP2 stars I can fall back to XHIP for distance information but this is not possible for TYC2. There are also some stars in Gaia DR2 that do not ...
by ajtribick
16.02.2020, 20:48
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

I saw differences between GrantHutchinson's catalog (found on celestiamotherlode : http://celestiamotherlode.net/catalog/show_addon_details.php?addon_id=1114) and gaia catalog ! This is expected. That catalogue (originally by Pascal Hartmann, converted to Celestia 1.4.0 format by Grant Hutchison) i...
by ajtribick
15.02.2020, 18:19
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

Good to know it works on 32-bit! One way of finding out how many stars there are in a stars.dat file is to take the file size in bytes, subtract 14 (to account for the file header, which incidentally also contains the number of stars) then divide by 20.
by ajtribick
15.02.2020, 12:19
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

Fixed an issue with duplicate stars which resulted from not accounting for duplicate entries in the SAO cross match. The v0.1.2-alpha release is linked in the first post of the thread.
by ajtribick
16.01.2020, 07:02
Forum: Add-on releases
Topic: Updated stars.dat including Gaia DR2 data (update 2020-02-15)
Replies: 49
Views: 2058

Re: Updated stars.dat including Gaia DR2 data (update 2020-02-15)

Janus wrote:However, small issue.

They require a gaia account to do the queries.
Something you should warn people about.
Indeed, that's why it's the second bullet point in the Prerequisites section of the README.md that's displayed on the main page of the repository on GitHub.

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