Talk:List of objects at Lagrange points

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Why do the "dust clouds" link in the L4 and L5 sections go to an article about terrestrial weather phenomenon?

Fixed. JamesHoadley 17:38, 14 October 2005 (UTC)

Trojan points vs Trojan asteroids

I just removed references to Asteroids in L4 or L5 of, say, Neptune/Sun as Trojan Asteroids. I think Trojan Asteroids are only objects in L4 or L5 of Jupiter/Sun. I think it's OK to refer to any L4 or L5 point as a Trojan Point, but that's for the Lagrangian point article.

It may be acceptable to refer to an "Asteroid in a Trojan point of PlanetXYZ-Sun" as "Trojan Asteroid of PlanetXYZ".

JamesHoadley 06:29, 14 November 2005 (UTC)

Exact position of L4, L5

In Earth-Sun Lagrangian points, under L4 and L5, the page has "located in the Earth's orbit".

That is not exactly true; the points are just outside Earth's orbit.

L4 & L5 are 60° from the secondary as seen from the centre of the primary; the four distances of L4 & L5 from the centres of the two massive bodies are all equal to the separation of those centres. But the secondary does not orbit the primary's centre; it orbits the barycentre. The primary and secondary orbital radii add up to the separation of their centres.

82.163.24.100 12:50, 22 February 2007 (UTC)

Nomenclature

I think that, when describing a set of Lagrange points by naming the corresponding two massive bodies, always to refer to those bodies in order of size.

So - Sun-Earth, Sun-Mars, Sun-Jupiter, Sun-Neptune (alternatively, reverse the others).

82.163.24.100 12:55, 19 June 2007 (UTC)

Explain, please

At no point does this article explain what the Lagrangian points are all about, and what the relevance is. —Preceding unsigned comment added by 84.197.233.106 (talk) 17:44, 10 May 2009 (UTC)

The link in the first sentence of the article should help with that. 82.163.24.100 (talk) 10:45, 21 June 2009 (UTC)

Herschel

Does the Herschel entry need updating? 82.163.24.100 (talk) 18:34, 9 August 2009 (UTC)

Citation needed and Failed verification

After unlinking the incorrect Kordylewski cloud (an Earth-Moon Lagrangian item), I have tagged a few claimed Sun-Earth Lagrangian items with {{Citation needed}} and {{Failed verification}}:

• Dust clouds{{citation needed}} reason=need specific claim of observations of dust at Sun-Earth L4 (not Earth-Moon L4), with page numbers; none found in 1998 Kelsall paper {{Failed verification}} reason=cite mentions trailing blob at 10 degrees, this is not L4}}

Simililarly for the claimed Sun-Earth L5 item:

• Dust clouds

Table 1 in Kelsall's paper details the Trailing Blob component. Now, Figure 4 in Kelsall's paper page 50 shows diagrams for "Cloud+Bands+Ring" with "Bands Only" and "Ring Only", and these appear to indicate a torus shaped cloud at 1 A.U. and other components from the Sun, but I saw nothing that stated they were specifically "at" L4 and L5 longitudes. Page 3 mentions dust "being resonantly trapped by the Earth in orbits near 1 AU", and again on page 14, but nothing specific to L4 or L5.

-84user (talk) 14:49, 2 November 2009 (UTC)

GEOTAIL and Hiten

Former GEOTAIL was removed because its apogee is 200000km[1]. But the 200000km is apogee after lowered by lunar swing-by. At first, GEOTAIL's orbit was kept night side of earth and apogee to maximun 220 earth radii (= more than 1400000km)JAXA GEOTAIL. i.e. GEOTAIL stayed around L2 for a month (under mentioned) periodically. Since the section name is "Past probes", GEOTAIL should belong to there.

Hiten was test probe of GEOTAIL. Same orbit was tested once. Thereafter, Hiten's apogee was momentarily bringed to 1532000km[2] by lunar swing-by to change its orbit to earth-lunar L4 and L5. In the figure of ISAS news 154 [3](in Japanese), the test orbit of GEOTAIL (1350000km apogee) stays at magnetotail for 1 month. The after orbit (1530000km apogee) stayed at magnetotail for 3 months. Of cource, magnetotail trails on night side of earth. --Gwano (talk) 07:59, 10 April 2010 (UTC)

switching Darwin for PLATO in L2 planned missions

Darwin has been canceled and it looks like PLATO has taken its place Jhmadden (talk) 19:29, 16 July 2015 (UTC)

Updating Sun-Earth L2 planned and current probes

James Webb Space Telescope has been launched and successfully reached Sun-Earth L2. 204.101.18.66 (talk) 20:09, 5 September 2022 (UTC)

References