Talk:List of extrasolar planet extremes

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This article was nominated for deletion on 12 September 2007. The result of the discussion was Nomination withdrawn.

Contents 1 sources 2 PSR B1257+12 D 3 HAT-P-1 4 Old table 5 Least massive 6 There is no way to tell the most massive known extrasolar planet. 7 Is 2M1207b known to be in a bound orbit? 8 Add category

[edit] sources

The sources were left behind on extrasolar planet when this was split off

[edit] PSR B1257+12 D

PSR B1257+12 D could be defined as a planet if the 2006 redefinition of planet... it's larger than Ceres. 132.205.93.195 03:33, 18 August 2006 (UTC)

[edit] HAT-P-1

How does the discovery of HAT-P-1 affect the status of HD 209458 b as the largest and least dense? ThreeBlindMice 02:43, 15 September 2006 (UTC)

[edit] Old table

Title	Planet	Star	Notes
Oldest	PSR B1620-26c	PSR B1620-26	12.7 billion years old
Youngest	2M1207 b	2M1207	8 million years; first exoplanet imaged; first orbiting brown dwarf
Most massive	HD 136118 b	HD 136118	11.9 MJupiter (Note: Only the minimum mass is known.)
Least massive	PSR B1257+12 A	PSR B1257+12	0.02 MEarth (Note: PSR 1257+12 system may include possible asteroidal object, but it is not massive enough to qualify as a planet)
Largest	COROT-Exo-1b	COROT-Exo-1	Has a radius of 1.78 RJupiter (Note: Only radii of transiting planets are known.)
Smallest	Gliese 436 b	Gliese 436	Has a radius of 4.327 REarth (Note: Only radii of some planets are known.)
Most distant	OGLE-2005-BLG-390Lb	OGLE-2005-BLG-390L	21,500 ± 3,300 light years (Note: A controversial microlensing event of lobe A of the double gravitational lens Q0957+561 suggests that there is a planet in the lensing galaxy lying at redshift 0.355 (7.8 Gly).)
Least distant	Epsilon Eridani b	Epsilon Eridani	10.4 light years
Most dense	?	?	?
Least dense	TrES-4	GSC 02620-00648[1]	0.24 g/cm³ (Note: Only mass and radius are known.)
Longest period	2M1207b	2M1207	2450+ years
Shortest period	OGLE-TR-56b	OGLE-TR-56	1.2 days (Note: SWEEPS-10 (awaiting confirmation) has an orbital period of 0.424 days (10.2 hours).)
Most eccentric orbit	HD 80606 b	HD 80606	eccentricity of 0.927
Least eccentric orbit	PSR B1257+12 A	PSR B1257+12	eccentricity of 0.0
Most inclined orbit	HAT-P-2b	HD 147506	inclination 90°
Least inclined orbit	Epsilon Eridani b	Epsilon Eridani	inclination 30.1° (Note: Most planets do not have their inclinations measured.)
Largest orbit	2M1207b	2M1207	55+ AU
Smallest orbit	Gliese 876 d	Gliese 876	0.021 AU (Note: SWEEPS-10 (awaiting confirmation) has an orbital distance of 0.008 AU (1.2 million km).)

Title	Star	Notes
Lowest Metalicity	HD 155358	−0.68 dex Note: Planets are thought to preferentially form from nebulæ with a metal-rich composition. The lowest metalicity star about which planets can form is thus important to formation models and future planet searches.

[edit] Least massive

I've added this, because we know much about the lower bound of planetary mass for discovered planets. Since the exact mass of the pulsar planet is known, and it is smaller than the lower bound of any non-pulsar planet, it seems reasonable to include on the list. 132.205.44.5 23:32, 12 September 2007 (UTC)

Playing Devil's advocate here, true masses are only known for planets B and C. The true mass of planet A is based on the assumption that it lies in the mean plane of the outer two planets. While this is almost certainly a reasonable assumption (the two outer planets are nearly coplanar), strictly the true mass of PSR B1257+12A is unknown. Chaos syndrome 23:36, 12 September 2007 (UTC)

[edit] There is no way to tell the most massive known extrasolar planet.

Well, aside from XO-3b not yet being published in a refereed journal (only thing we have is some text submitted to an abstracts listing service and a press release), saying we can tell the most massive planet is misleading, because it is perfectly possible that one of the planets for which we know only a minimum mass is more massive and still below the brown dwarf boundary (which if defined by deuterium fusion is actually a function of metallicity: the value of 13 Jupiter masses is for solar composition). Chaos syndrome 07:05, 13 September 2007 (UTC)

[edit] Is 2M1207b known to be in a bound orbit?

According to [1], the object 2M1207b may or may not be in a bound orbit around 2M1207. So while on the assumption that the orbit is bound, this object would have the largest orbit of any known planetary mass object, I'm not sure making the assumption is valid. I'm going to remove the entry for largest orbit on this basis - feel free to put it back if you can cite evidence that the orbit is bound. Chaos syndrome 13:17, 15 September 2007 (UTC)

[edit] Add category

I propose "Least massive planet around normal star", because it is distinct from "least massive in general". Why? Simple I'm not interested in some dead world around some pulsar. But I would be interesed in record holder by lowest mass around normal star. --84.10.180.181 (talk) 17:10, 10 March 2008 (UTC)

Define normal star. Do you mean main sequence star, Sun-like star, star still actively fusing? Or star larger than a red dwarf, of Sun-like metallicity, smaller than a subgiant, and on the main sequence? One can argue that a "normal star" is a red dwarf, only. 70.55.87.10 (talk) 11:49, 4 June 2008 (UTC)