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How can this planet have a density of 5428 kg/m³? Earth's density is of 5515 kg/m³, so that would make it more of a rocky planet than a gas giant. Futhermore, if this planet is 36% of Jupiter's mass and 72% of Jupiter's Radius, that would make: m= 6.8350e+026 kg, and r=48469150 m (using Jupiter's polar radius, I don't really know what a "Jupiter radius" is exactly, as Jupiter is not a perfect sphere), leading to a volume of 4.7696e+023 m³ (assuming it's a sphere) Therfore the density of the planet HD 149026 b should be 1433 kg/m³, higher than Jupiter's 1326.
This source, http://www.extrasolar.net/planettour.asp?StarCatId=normal&PlanetId=304, indicates that its density is "1.4 times that of water", so similar to the 1443 kg/m³ that I calculated. This other source, http://www.journals.uchicago.edu/ApJ/journal/preprints/ApJ64021.preprint.pdf, states that its density is 1180 +/30 kg/m³. Which is what you would get if you use Jupiter's Equatorial radius. But then you would get a lower density than Jupiter, contradicting the statement that HD 149026 b is very dense for a gas giant.
Since I'm not too sure about the volume, I won't change the page, but the 5428 density seems way off.
Any thoughts on this? And anyone know the value used for Jupiter radius? There are two different radius on the Jupiter entry. AtikuX 03:43, 23 July 2007 (UTC)
Answer: In July, a planet with the largest core ever discovered was announced. The planet, HD 149026 b, orbits the star HD 149026, and has a core that is estimated to be 70 Earth masses, accounting for two-thirds of the planet's mass.
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How can this planet have a density of 5428 kg/m³? Earth's density is of 5515 kg/m³, so that would make it more of a rocky planet than a gas giant. Futhermore, if this planet is 36% of Jupiter's mass and 72% of Jupiter's Radius, that would make: m= 6.8350e+026 kg, and r=48469150 m (using Jupiter's polar radius, I don't really know what a "Jupiter radius" is exactly, as Jupiter is not a perfect sphere), leading to a volume of 4.7696e+023 m³ (assuming it's a sphere) Therfore the density of the planet HD 149026 b should be 1433 kg/m³, higher than Jupiter's 1326.
This source, http://www.extrasolar.net/planettour.asp?StarCatId=normal&PlanetId=304, indicates that its density is "1.4 times that of water", so similar to the 1443 kg/m³ that I calculated. This other source, http://www.journals.uchicago.edu/ApJ/journal/preprints/ApJ64021.preprint.pdf, states that its density is 1180 +/30 kg/m³. Which is what you would get if you use Jupiter's Equatorial radius. But then you would get a lower density than Jupiter, contradicting the statement that HD 149026 b is very dense for a gas giant.
Since I'm not too sure about the volume, I won't change the page, but the 5428 density seems way off.
Any thoughts on this? And anyone know the value used for Jupiter radius? There are two different radius on the Jupiter entry. AtikuX 03:43, 23 July 2007 (UTC)
Answer: In July, a planet with the largest core ever discovered was announced. The planet, HD 149026 b, orbits the star HD 149026, and has a core that is estimated to be 70 Earth masses, accounting for two-thirds of the planet's mass.
There is a move discussion in progress on Talk:Upsilon Andromedae d which affects this page. Please participate on that page and not in this talk page section. Thank you. — RMCD bot 02:59, 17 December 2015 (UTC)
Hello fellow Wikipedians,
I have just modified one external link on HD 149026 b. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
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Cheers.— InternetArchiveBot ( Report bug) 06:09, 27 October 2017 (UTC)