Talk:Lacaille 9352

Hubble Space Telescope observation for a Jupiter-sized companion

I believe that the following statement:

No Jupiter sized object could be detected by the recent research using the Hubble Space Telescope.

was based upon information included in the SolStation article. The latter references Schroeder et al, 2000, but in reading through that journal article, GJ 887 was not included as one of the program stars. Therefore I believe that the SolStation article is in error and so I removed the above text from this article.

This statement is likely from the same source, and can't be readily cross-checked:

Its closest neighbor is the EZ Aquarii Triple Star System, 1.29 pc or 4.21 ly away.

It too was removed.—RJH (talk) 22:10, 20 January 2010 (UTC)[reply]

The closest currently known star system to Lac 9352 is indeed EZ Aqr ABC at ≈4.1 ly. Solstation used Chview simulation program to show it. --Yigor (talk) 08:00, 15 April 2010 (UTC)[reply]

I haven't found SolStation to be a completely reliable source. It can be a good starting point, but I have found a few errors on the site. (As per the example at the start of this section.) We should probably reference the Chview site.—RJH (talk) 16:08, 15 April 2010 (UTC)[reply]

Yeah, it's not obvious at all, U should put at least 50 nearest star systems on a 3D-map to be sure. Actually, my own simulations give also GJ 1 and SCR 1845-6357 at ≈4.3 ly from Lac 9352. In addition, HIP parallaxes used by RECONS and Solstation for some stars are now improved by the new HIP2 reduction. --Yigor (talk) 18:41, 17 April 2010 (UTC)[reply]

Well, finally, I put the info about its closest neigbour (EZ Aqr) referring to the ChView simulation. --Yigor (talk) 18:32, 20 April 2010 (UTC)[reply]

Thanks. I'm not really sure why it is of interest, unless the nearest star is especially close.—RJH (talk) 19:52, 20 April 2010 (UTC)[reply]

Yeah, anyway, let it be like that until someone finds a closer star or brown dwarf. lol ;) --Yigor (talk) 21:02, 20 April 2010 (UTC)[reply]

Actually, one of easy consequences of this proximity is that the constellation Piscis Austrinus is not far away from Aquarius! :D --Yigor (talk) 21:19, 20 April 2010 (UTC)[reply]

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The space velocity components of this star are (U, V, W) = (−93.9, −14.1, −51.4) km/s.

I can't see how this would yield a radial velocity of +9.7 km/s.

UVW space velocities are galactocentric. Does that help? Lithopsian (talk) 10:43, 10 May 2020 (UTC)[reply]

Planetary System

Why planetary system table been deleted for Lacaille 9352? This paper "Frequency of planets orbiting M dwarfs in the Solar neighbourhood" https://arxiv.org/abs/1906.04644v1 cleary showing evidence of planetary system of 3 planets around Lacaille 9352 (GJ 887) — Preceding unsigned comment added by Exoplanetcool (talk • contribs) 23:31, 3 June 2020 (UTC)[reply]

The paper is only a preprint, not accepted for publication, so not a reliable source. Given its age, it seems that it isn't going to be accepted for publication. Lithopsian (talk) 09:58, 4 June 2020 (UTC)[reply]

two planets been confirmed: https://researchprofiles.herts.ac.uk/portal/files/22224473/GJ887_3.pdf and the table was deleted again.

I've now amended the article based on the new work. ChiZeroOne (talk) 23:21, 29 June 2020 (UTC)[reply]

The article in "Nature" says the masses are "at least ... 4.2 and 7.6 times the mass of Earth". Shouldn't the table be updated (Mass >=, and not Mass =) ?--92.152.253.254 (talk) 16:31, 30 June 2020 (UTC)[reply]

Good point, Done. ChiZeroOne (talk) 17:14, 30 June 2020 (UTC)[reply]

Pronunciation

Should the pronunciation of Lacaille be included, like in Sirius ? I don't know how English-speakers say the name.--92.152.233.19 (talk) 18:18, 3 July 2020 (UTC)[reply]