User talk:75.166.172.10

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Bethune[edit]

WP:BRD and WP:LEAD. Just mention it on the talk page and go from there.Cptnono (talk) 06:09, 10 July 2010 (UTC)

I don't want to discuss it with you. Your reverts have no basis.

He is obviously, to any reasonable person, an environmental activist, etc...

Eventually your misplaced reverts will be overwhelmed by the common sense of the bulk of reasonable editors.

75.166.172.10 (talk) 06:15, 10 July 2010 (UTC)

Nemesis[edit]

I was referring to the Apparent_magnitude in the visual band by v. For a red dwarf reference, Wolf 359 is pretty close to the Red Dwarf/Brown Dwarf boundary (but comfortably on the red dwarf side), and at two and a half parsecs, has v = -13.5, so Hipparcos would see any Red Dwarf's parallax if it was ~2.5^2 ~6 times brighter than Wolf 359, which would correspond to a distance of ~1 parsec (since light intensity follows an inverse square law.) ~1 parsec is a typical distance between stars (for instance, the closest stars to the Sun are ~1.3 parsecs), so we would expect that anything bound to the Sun would necessarily be closer than that; otherwise, passing stars would come closer to the object than it would be to the sun, and unbind it.

For planets (or planetary mass objects, if one wishes to not call free floating planets planets; BALDERDASH! I say, but I digress), and especially brown dwarves, you'd probably need to think about other surveys & whatnot, I don't think Hipparcus is going to pick them up. I could probably math out a distance vs. is it detected relation, assuming you're just reflecting sunlight, but that's somewhat dicier? Maybe not. I really don't know brown dwarfs very well, but if one was 4.5 Gyrs old, I'd expect it to not emit in the v band. You'd have to think more about people cross-correlating Spitzer and 2MASS for detectability, I think? Which is more complicated. WilyD 14:14, 1 September 2010 (UTC)