Comment by superkuh

Comment by superkuh 2 days ago

13 replies

This slightly tilted view of the poles is a teaser. I didn't know they'd managed to incorporate late in the mission gravity assists into the cheaper plan B to slightly tweak out of the ecliptic while dropping close to the sun. That's pretty cool. https://upload.wikimedia.org/wikipedia/commons/6/66/Animatio...

But we could've had so much more. The original proposal A for the ESA Solar Orbiter was a highly inclined orbit relative to the ecliptic plane to truly get full polar views of the sun. But this was too expensive. So they went with the cheaper proposal B which was mostly just a spectroscopic platform. Similar to SDO AIA, except in a solar orbit (almost completely within the ecliptic plane) instead of SDO AIA's Earth based sun synchronous orbit.

BurningFrog 2 days ago

They plan to get a more polar orbit each time they get close to Venus: https://www.esa.int/ESA_Multimedia/Images/2020/01/Solar_Orbi...

Not sure if 33° angle in 2029 is the final "polarity" or if they'll keep tilting after that.

  • widforss 2 days ago

    Wouldn't the tilt affect the gravity assist of Venus?

    • zamadatix 2 days ago

      The planning of sure, you've gotta make sure you're crossing the plane at the time, but gravity assist itself is otherwise the same though.

      • widforss 2 days ago

        At the time, every time, and the position of Venus changes with every orbit. But I guess the folks at ESA are proficient in math.

hcarvalhoalves 2 days ago

I suppose it takes a lot of deltaV to get a stable orbit over the sun poles?

  • ChocolateGod 2 days ago

    You'd need to completely cancel out the rotation of the solar system, far beyond what we have the technology to do.

  • sandworm101 2 days ago

    It does, but most of the needed dV is harvested from the planets during gravity assists. The probe is accelerated/turned several hundred or thousand m/s and in exchange the planets it passes are shifted/slowed/turned by maybe 0.00000000000000000000001 m/s. In this case, the probe largely needs to slow down, to bleed of the speed it got from being at earth's orbit, so the planets are probably being accelerated.