<p>Comets' orbits often change during perihelion passage due to the outgassing of volatiles. So I am wondering, how much change in velocity is applied each perihelion pass? What does this depend on?</p>

CC BY-SA 4.0
2021-11-12T17:22:44.393Z
All comets are different. And each one changes on each orbit, so there is no answer here - it is hugely variable. Your best bet if you want to know historical values is to look them up for each comet where the data has been recorded.
Rory Alsop
CC BY-SA 4.0
2021-11-14T10:54:07.020Z
I think you can adjust the question to ask for specific examples, or for a resource where orbital solutions are used to extract "non-gravitational accelerations". See for example [Did Rosetta improve on models of non-gravitational effects on comet 67P's orbit?](https://space.stackexchange.com/q/18474/12102)
uhoh
<orbit><comets>
Average DeltaV applied to a comet during outgassing?
WarpPrime
# Average DeltaV applied to a comet during outgassing?

(Asked by: username_0 on 2021-11-12)

Comets' orbits often change during perihelion passage due to the outgassing of volatiles. So I am wondering, how much change in velocity is applied each perihelion pass? What does this depend on?

**Tags:** orbit, comets

> **Comments:**
> **username_1**: All comets are different. And each one changes on each orbit, so there is no answer here - it is hugely variable. Your best bet if you want to know historical values is to look them up for each comet where the data has been recorded.  
> **username_2**: I think you can adjust the question to ask for specific examples, or for a resource where orbital solutions are used to extract "non-gravitational accelerations". See for example [Did Rosetta improve on models of non-gravitational effects on comet 67P's orbit?](https://space.stackexchange.com/q/18474/12102)  

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