Talk:Epsilon Indi

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Space velocity[edit]

Note that R. Lachaume et al (1999) lists space velocity components for HD 209100 of:

U = -44.3, V = -27.0, W = 27.3

which is significantly different from the Kollatschny (1980) paper. — RJH (talk) 19:18, 12 July 2007 (UTC)

Project Ozma[edit]

I'm starting to think that the following sentence is incorrect: "During Project Ozma in 1960, this star was examined for artificial radio signals, but none were found." There is only one source that states this; all others say that only Epsilon Eridani and Tau Ceti were observed by Drake. However, it is possible it was examined by Project Ozma II (Benjamin Zuckerman & Patrick Palmer, 1973–1976). Unfortunately I haven't been able to locate a definitive list of the Ozma II targets.—RJH (talk) 20:16, 18 February 2011 (UTC)

Bolometric Luminosity[edit]

Is the absolute magnitude value given for Epsilon Indi in this article wrong or at least inconsistent with the effective temperature and radius claimed for Epsilon Indi in this article?

Per what follows, do you mean absolute magnitude or luminosity?—RJH (talk) 14:42, 26 May 2011 (UTC)

Because, you get a different luminosity figure for Epsilon Indi, much more like the luminosity values I've seen elsewhere on the internet given for Epsilon Indi, if you use the Absolute Magnitude value of Epsilon Indi, taken from this article and put into the formula below to calculate the Bolometric Luminosity.

L=10^(0.4*(Mbol(sun)-Mbol (epsilon indi)) Where Mbol = MV + BC.

Mbol (sun) = 4.83 -0.08 = 4.75 Mbol (epindi) = 6.89 - 0.51 = 6.38

L = 10^(0.4* (4.75 - 6.38)) = 10^(0.4*-1.63) = 10^-0.652 = 0.22 instead of the 0.17 calculated using a different formula, calculated from the effective temperature and radius, and used in this article. — Preceding unsigned comment added by 86.179.31.119 (talk) 02:21, 26 May 2011 (UTC)