Talk:51 Pegasi

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First exoplanet??

The statement describing 51 Peg b as "the first discovered planetary-mass companion of its parent star" ignores the earlier discovery in 1992 of PSR B1257+12 B and PSR 1257+12 C. These are both planetary-mass objects and are no less "companions of their parent star" than 51 Peg b. Better to stick to the "first around a main-sequence star" language, which is unambiguous. — Preceding unsigned comment added by 65.100.126.140 (talk) 22:58, 17 November 2018 (UTC)[reply]

[Untitled]

I've added some details from the German wiki article, but left out a paragraph on Dr. David Latham speculating on a second planet around 51 Peg. I do recall discussion on a second planet from detailed analysis of the doppler plots, but cannot now find believable references, and all reliable sources just list the one 51 Peg b.

Some intersting references:

51 Peg c

I don't think the very hypothetical planet 51 Pegasi c should be included to this article until it is confirmed or at least it has more evidence. Just a blog entry isn't enough!--Jyril 06:00, 10 April 2006 (UTC)[reply]

Agreed. In addition the designation "51 Pegasi c" isn't official either, so we probably shouldn't be using it. Chaos syndrome 20:00, 10 April 2006 (UTC)[reply]

Well, now. The 51 Pegasi c is confirmed, and is not a planet most likely a brown dwarf or low-mass star, based on a mass of 70 M_J and has a spectral type of T. Orangefanta120 (talk) 07:02, 16 November 2024 (UTC)[reply]

Temperature

The 1295 K value looks like it has been taken from Extrasolar Visions. This is a speculative calculated value based on several simplifying assumptions. In addition, when I do the calculation myself using the values for star temperature, radius, planet semimajor axis and bond albedo presented on the Extrasolar Visions website, I do not get this value. The temperature of the planet has not been measured but presenting it here makes it seem as though it has. Unless the value can be found in the scientific literature, I feel it is best to leave such speculative values out of the article. Chaos syndrome 11:56, 10 April 2006 (UTC)[reply]

Learn to spell

As I understand it, 51 Peg b=Peg beta; shouldn't it be written out as such? Trekphiler (talk) 15:07, 11 June 2008 (UTC)[reply]

No, a lower-case letter after a star's name indicates the designation of a planetary companion around the star, in order of discovery. If a second planet were discovered it would be 51 Peg c. Capital letters after star designations indicate members of multiple stars systems, e.g. Sirius A and Sirius B. Greek letters are usually used in star designations in the Bayer designation which names stars in constellations using Greek letters, e.g., Sirius is the brightest star in Canis Major so that's $\alpha$ CMa. shorlin (talk) 16:22, 6 October 2008 (UTC)[reply]

Stellar classification

According to this article, its "spectral type is listed as either G2.5IVa[2] or G4-5Va." While this is true, according to the 'mk' properties section on the SIMBAD query, the two measurements since 2000 give G2.5 IVa and G2V+. The G4-5V results are from 1957–1970.—RJH (talk) 14:57, 10 May 2010 (UTC)[reply]

Never mind. This source from 2009 lists G5V. The inconsistency seems odd.—RJH (talk) 15:18, 10 May 2010 (UTC)[reply]

However, the radius and mass given (as well as the temperature given here) show tremendous deviation from the standard values for G5; they match something like G2 much better. This database also indicates G2 for the spectral type, albeit IV for luminosity class. This is quite confusing. Apha (talk) 02:44, 26 January 2014 (UTC)[reply]

position of star in picture is wrong

The position of the star in the chart is wrong (it should be more to the right, outside the pegasus-quadrilateral. Check the coordinates or compare to the german Wikipedia (there's a map there too). 81.62.121.68 (talk) 20:36, 2 October 2015 (UTC)[reply]

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