Stars color index (B-V)

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

Thank you for your quick a answer.

You’re right of course.

I wanted just to point out the lack of consistency which ends up with Aldebaran (Stellarium B-V color index= 1.55) being (very) slightly more red compared to Betelgeuse (1.52), actually 1.82 in Nicolet's catalog, 1978.

Best regards
Provenance : Courrier pour Windows 10

De : gzotti
Envoyé le :dimanche 8 avril 2018 18:15
À : <email address hidden>
Objet :[Bug 1762194] Re: Stars color index (B-V)

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

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Title:
  Stars color index (B-V)

Status in Stellarium:
  New

Bug description:
  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.
  Regards

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One task "somebody" should do in the next 5 years or so is switching to Gaia data. In this process, we should think about best non-positional data as well. Volunteers welcome.

The bug report was moved to https://github.com/Stellarium/stellarium/issues/374