<p><a href="https://en.wikipedia.org/wiki/Indian_Space_Research_Organisation" rel="nofollow noreferrer">ISRO</a>'s next mission to the Sun is <a href="https://en.wikipedia.org/wiki/Aditya-L1" rel="nofollow noreferrer">Aditya-L1</a>, (also <a href="https://www.isro.gov.in/aditya-l1-first-indian-mission-to-study-sun" rel="nofollow noreferrer">here</a>), which will be placed at the Sun-Earth Lagrangian point L-1. </p>

<p>Why it is not placed near L-4 or L-5, since these are stable equilibrium point whereas L-1 is unstable equilibrium? What is the advantage to placing Sun-observing satellites like Aditya near the L-1 point?</p>

CC BY-SA 3.0
2018-01-29T18:29:12.890Z
You might look at the distances involved. L4 and L5 are 1AU away from the Earth, whereas L1 is 100 times closer. Then think about trying to use your cell phone or WiFi to upload data, and having a choice between two seats, one being 100 times farther from the transmitter than the other.
uhoh
CC BY-SA 3.0
2018-01-29T18:30:55.933Z
fyi there is also a [Space Exploration](https://space.stackexchange.com/) Stack Exchange site. You can search there for questions about halo orbits.
uhoh
CC BY-SA 4.0
2021-06-29T10:11:28.727Z
I find the [Wiki list of objects at Lagrange points](https://en.wikipedia.org/wiki/List_of_objects_at_Lagrange_points) interesting.
B--rian
<the-sun><orbit><orbital-mechanics>
Aaditya L1 mission ISRO
Gauti
# Aaditya L1 mission ISRO

(Asked by: username_0 on 2018-01-29)

[ISRO](https://en.wikipedia.org/wiki/Indian_Space_Research_Organisation)'s next mission to the Sun is [Aditya-L1](https://en.wikipedia.org/wiki/Aditya-L1), (also [here](https://www.isro.gov.in/aditya-l1-first-indian-mission-to-study-sun)), which will be placed at the Sun-Earth Lagrangian point L-1.

Why it is not placed near L-4 or L-5, since these are stable equilibrium point whereas L-1 is unstable equilibrium? What is the advantage to placing Sun-observing satellites like Aditya near the L-1 point?

**Tags:** the-sun, orbit, orbital-mechanics

> **Comments:**
> **username_1**: You might look at the distances involved. L4 and L5 are 1AU away from the Earth, whereas L1 is 100 times closer. Then think about trying to use your cell phone or WiFi to upload data, and having a choice between two seats, one being 100 times farther from the transmitter than the other.  
> **username_1**: fyi there is also a [Space Exploration](https://space.stackexchange.com/) Stack Exchange site. You can search there for questions about halo orbits.  
> **username_2**: I find the [Wiki list of objects at Lagrange points](https://en.wikipedia.org/wiki/List_of_objects_at_Lagrange_points) interesting.  

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## 0 answers

