Talk:Gliese 876 b

Good article

Well written, well referenced with a great image to boot. Promoted -- Samir धर्म 10:52, 25 August 2006 (UTC)

Inclination and true mass

Since there is a discrepancy between astrometric and radial velocity determinations for the orbital inclination of this planet, I have removed inclination from the infobox and restored the lower mass limit value. Chaos syndrome 15:01, 28 July 2007 (UTC)

GA Sweeps Review: Pass

As part of the WikiProject Good Articles, we're doing sweeps to go over all of the current GAs and see if they still meet the GA criteria. I'm specifically going over all of the "Planets and Moons" articles. I believe the article currently meets the criteria and should remain listed as a Good article. I have made several minor corrections throughout the article. Altogether the article is well-written and is still in great shape after its passing in 2006. Continue to improve the article making sure all new information is properly sourced and neutral. I would also recommend going through all of the citations and updating the access dates and fixing any dead links. If you have any questions, let me know on my talk page and I'll get back to you as soon as I can. I have updated the article history to reflect this review. Happy editing! --Nehrams2020 (talk) 10:17, 20 February 2009 (UTC)

Habitable Zone

There is no source given, a journal paper or anything else, for the specific claim in the article that Gliese 876 b's orbit lies within the habitable zone of Gliese 876. At 0.208317 AU it would receive about the same amount of bolometric illumination, or heat, as an object at 1.83 AU would receive in our solar system. That's far beyond the orbit of Mars, at the inner asteroid belt. Using Kasting et al.'s 1993 definition of a habitable zone, scaled down for Gliese 876, would place the inner edge of the habitable zone at 0.108317 AU and the outer edge of the habitable zone at 0.156204 AU for the system. That would put Gliese 876 c right in the middle of the habitable zone but Gliese 876 b at 0.208317 AU lies beyond the outer edge of the habitable zone. Just because Gliese 876 is a type III gas giant doesn't mean it's in the habitable zone.

"Gliese 876 b lies within the habitable zone of Gliese 876 as defined by the ability of an Earth-mass planet to retain liquid water at its surface." Whose definition is that being used here? Certainly not Kasting et al. 1993's defintion as according to their defintion an Earth massed planet orbiting Gliese 876 at Gliese 876 b's distance would experience complete global glaciation, so no surface water! If Fogg 1992 is being used to define the habitable zone, 0.95 - 3.0 AU, to justify the claim that Gliese 876 b is in the habitable zone, then Gliese 876 e is also orbiting inside the habitable zone of Gliese 876. Scaled up, Gliese 876 e would recieve the same amount of bolometric illumination, or heat from its sun, as a body orbiting at 2.932 AU would in our solar system. — Preceding unsigned comment added by 86.186.181.123 (talk) 21:53, 6 July 2012 (UTC)