Talk:Halo orbit

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ISEE-3[edit]

Just reverted "ISEE-U" to ISEE-3. The former was red-linked. I think it must have been the pre-launch designation, as NASA used to denote un-launched satellites with a letter (eg, OSO-H) and then change that to a numeral (eg, OSO 7) once they were up and successfully operating. Anyhow, it was widely known as ISEE-3 from after launch in 1978 until it was re-named "ICE" for "International Cometary Explorer" and sent off to look at a comet. (A redirect from ISEE-U to ISEE-3 would be fine with me.) Wwheaton (talk) 04:52, 15 January 2009 (UTC)[reply]

Animated GIF[edit]

I might be wrong but it seems to me that the satellite on this animation is orbiting around nothing, just between the Moon and L2. Shoudn't it orbit (on the same banana-shaped trajectory) around L2, a little more to the right of this picture? 81.53.143.67 (talk) 21:09, 9 February 2009 (UTC)[reply]

I agree. I removed the animation a year ago, and now user:Kerichill has put it back in. I think we should not include it because it seems to be wrong and there is no reference. Eric Kvaalen (talk) 11:03, 5 December 2013 (UTC)[reply]

I have not seen the GIF, but there are defniteley orbits that lay between the the moon (or secondary planet of the system) and the L2, not just right around L2. They just vary in size.

This diagram shows a (symbolic?) halo orbit around L1. [1] [2]

Haven't seen the animation either, but it is perfectly possible for a Halo Orbit to exist somewhere between the moon and the Eart-Moon-L2. According to my own analysis they are even more stable and more easy to control (a spacecraft in a Halo-Orbit has to make active trajectory correction every revolution!) than a Halo-Orbit that actually orbits the Lagrangepoint/Librationpoint. Also the shape of the orbit is far from being a circle so it is actually not so easy to define when a Halo-Orbit really orbits the Lagrangepoint. — Preceding unsigned comment added by 194.114.62.124 (talk) 09:00, 3 December 2015 (UTC)[reply]

Definition of Halo vs. Lissajous[edit]

I wish that Halo orbits were defined here with slightly more content, at least descriptive, by someone who understands them. Are Halo orbits a special subset of a larger class of Lissajous orbits? It would help me to have some mention of the typical range of periods of Halo psuedo-orbits (compared to the period of the larger two bodies). jimswen (talk) 22:09, 13 December 2014 (UTC)[reply]

Agreed, the article is too general. It just says that a halo orbit is a type of orbit (who'd have thought), without describing what orbit it actually is. The diagram doesn't help, and is somewhat misleading: it shows the Lagrange points but not the Halo orbits.2602:306:CEAE:E60:1DD3:419B:DDDC:1669 (talk) 06:36, 21 May 2018 (UTC)[reply]

Introduction[edit]

The present Introduction includes "Halo orbits are the result of a complicated interaction between the gravitational pull of the two planetary bodies and the Coriolis and centrifugal accelerations on a spacecraft.".

Coriolis and centrifugal accelerations are essentially fictitious; all non-relativistic orbits are a direct result of combining the Newtonian gravitational fields (or other fields) and considering the consequences. Evidently Lagrange understood that.

94.30.84.71 (talk) 14:32, 24 September 2017 (UTC)[reply]

SOHO?[edit]

The Lissajous orbit article lists SOHO as having used a Sun-Earth L1 Lissajous orbit. It's also listed here. Has its orbit type changed? 165.225.38.204 (talk) 13:43, 27 October 2017 (UTC)[reply]

According to the Earth Observatory Portal, SOHO is correctly listed here as having a Halo orbit. The site includes a schematic diagram of the orbit (https://directory.eoportal.org/web/eoportal/satellite-missions/s/soho).165.225.38.204 (talk) 14:03, 27 October 2017 (UTC)[reply]

External links modified[edit]

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Sub-section Near Rectilinear Halo Orbits (NRHOs)[edit]

A section for NRHOs may be of interest as NASA's LOP-G station is intended to be placed in one. Further information can be found here:

Targeting Cislunar Near Rectilinear Halo Orbits for Human Space Exploration https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20170001352.pdf
Cislunar Near Rectilinear Halo Orbits for Human Space Exploration https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20160003078.pdf
Options for Staging Orbits in Cis-Lunar Space https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20150019648.pdf — Preceding unsigned comment added by 24.22.169.89 (talk) 15:32, 16 September 2018 (UTC)[reply]

North and south[edit]

What's this about north and south families of orbit? Doesn't each orbit go north south east west? Jim.henderson (talk) 01:09, 3 November 2018 (UTC)[reply]

It refers to the locations of the apoapsis of the orbits.

(sdsds - talk) 21:28, 8 February 2024 (UTC)[reply]

Sphere of influence of secondary body[edit]

Without relying on WP:original research it would improve the article if an assertion could be made that a halo orbit is at least partially outside the sphere of influence of the secondary body. Is there a source for that? (sdsds - talk) 21:26, 8 February 2024 (UTC)[reply]