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Stars color index (B-V) #374
Description
Original report by Bernard Balusseau: https://bugs.launchpad.net/stellarium/+bug/1762194
Some stars, not all, have huge B-V color index shifts compared to classical photometric catalogs such as Ducati, 2002 or Nicolet, 1978.
Two examples on brighting stars:
- Arcturus 0.82 on Stellarium, 1.23 on Ducati, 2002
- Betelgeuse 1.52 on Stellarium, 1.85 on Nicolet, 1978.
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gzotti commentedon Sep 27, 2018
(From original discussion)
Different catalog, different result...
http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%2027989
and even different in TYC
http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=+I%2F239%2Ftyc_main&-from=nav&-nav=cat%3AI%2F311%26cat%3AI%2F239%26tab%3A%7BI%2F239%2Fhp_notes%7D%26key%3Asource%3D1311%2Fhip2%26key%3Asource%3D1239%2Fhip_main%26HTTPPRM%3A%26-out.add%3D.%26HIP%3D27989%26-go+%25%23Sesame%23%25%26
One task "somebody" should do in the next 5 years or so is switching to Gaia data, including correct proper motion. In this process, we should think about best non-positional data as well. Volunteers welcome.
gzotti commentedon Dec 21, 2019
This is actually a duplicate of #364 but both entries have interesting links.
Atque commentedon Dec 28, 2024
Surely solved by #3992?
gzotti commentedon Dec 28, 2024
Our B-V is created from the HIP/Gaia DR3 now. This is not necessarily the same as whatever Ducati or Nicolet have reported, but unless you can provide a cross index between those two catalogs, there is not much that can be done to reproduce anything but what's in DR3. Do not expect we use your favourite catalog instead. However, now Stellarium shows 1.23 for Arcturus, and 1.85 for Beteigeuze, so the reported issue seems solved.
github-actions commentedon Dec 29, 2024
Hello @alex-w!
Please check the fresh version (development snapshot) of Stellarium:
https://github.com/Stellarium/stellarium-data/releases/tag/weekly-snapshot
henrysky commentedon Dec 31, 2024
Just to add that$B-V$ index for most stars without HIP ids in the new star catalog are measured from low resolution Gaia optical spectra (so unlikely those $B-V$ will match any catalog) while stars with HIP have their $B-V$ pulled from SIMBAD whatever SIMBAD thinks is the best.
gzotti commentedon Dec 31, 2024
Ah, thanks. This info should go into the User Guide. Some people are using Stellarium for reference and may report "errors" when they find data in different catalogs. It would be fine if you name which Gaia list entries were processed with which algorithms.
github-actions commentedon Mar 23, 2025
Hello @alex-w!
Please check the latest stable version of Stellarium:
https://github.com/Stellarium/stellarium/releases/latest