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Deploy and Speak To LEAVES on Venus

January 9, 2025
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Deploy and Speak To LEAVES on Venus
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We reported earlier than a few NIAC-funded challenge often known as the Lofted Setting and Atmospheric Venues Sensors (LEAVES) mission to review Venus’ environment. Whereas the know-how behind the thought remains to be underneath improvement, it has already impressed a staff of Worcester Polytechnic Institute (WPI) undergraduates to develop a supporting satellite tv for pc mission to launch and talk with the leaves. Their paper, a part of their B.S. Thesis, particulars find out how to use these new sensors and the challenges forward.

As a refresher – the principle distinctive promoting level of LEAVES is that they’re cheap methods to gather information about Venus’ environment – a minimum of from the peak of about 100km right down to 30km, the place a variety of fascinating atmospheric physics is happening. They’re designed and not using a propulsion system and, as such, glide down on their very own accord, sending again information concerning the native strain, temperature, atmospheric composition, and the probe’s orientation by way of an inertial measurement unit like these used on drones.

They aren’t supposed to final lengthy, however the brief time they are going to be current within the environment may present insights into a number of excellent questions on Venus, equivalent to what compound is absorbing near-ultraviolet mild within the higher environment or the native carbon monoxide focus. Nonetheless, their distribution over the planetary floor is a important a part of any such effort – which is the place the mission design from the staff at WPI is available in.

Venus’ atmosphere is harsh on know-how, as Fraser discusses on this video.

Their mission design revolves round two spacecraft joined collectively for launch and strategy to Venus however then breaking up into wildly completely different orbits. Considered one of them, Demeter, is answerable for launching the LEAVES. The opposite, Persephone, is known as after Demeter’s daughter, whom Venus’ Greek equal had taken away to the underworld. It’s left at a better orbit and answerable for transmitting the information collected by the LEAVES again to Earth.

Demeter had two necessary design selections—one was the place to deploy the LEAVES, and the second was find out how to. The staff got here up with a deployment technique of eight LEAVES each 20 meters of latitude the whole method across the planet, for a complete of 144 probes. Importantly, these could be deployed on the day/night time mild to look at how the distinction between day and night time would possibly play a task within the sulfur dioxide cycle on Venus. 

deploy them provided a special problem – the staff settled on 18 miniature housings, every hooked up to a small strong rocket booster utilizing hydrazine. Demeter would orbit across the planet at an altitude of about 235km and would launch eight LEAVES each 20 levels across the planet. These LEAVES would descend by the environment – some across the equator, some across the poles – and would deploy their glide type at about 150km from the floor. At round 100 km, they might begin sending again information to Persephone, ready overhead. After its deployment mission was full, Demeter itself would deorbit and begin burning up in Venus’ environment.

Cosmic Voyages discusses the LEAVES challenge.
Credit score – Cosmic Voyages YouTube Channel

Persephone has a a lot less complicated job—it makes use of a rocket booster to succeed in a 2000km orbit and patiently waits till the LEAVES are deployed. It then makes use of a high-gain antenna to choose up alerts from the LEAVES’ comparatively weak communications techniques and shops them on its native onerous drive. As soon as all the information has been gathered, Persephone transmits it again to Earth.

All of the elements besides one on each satellites have very excessive Know-how Readiness Ranges (TRL-9). The only exception is the deployment tubes for the LEAVES, which have an anticipated TRL of 1-2, that means they might require extra improvement and testing earlier than being prepared for prime time.

There isn’t a deadline for that improvement and testing for now as LEAVES remains to be only a NIAC challenge and has not been chosen for a mission alternative to Venus. Given the rising curiosity in exploring our sister planet, it appears doubtless {that a} comparable mission will sometime launch – and perhaps among the staff that spent a lot of their senior yr engaged on this challenge can have a hand in engaged on the model that lastly does make it there.

Be taught Extra:
Baxter et al. – Design and Analysis of a SmallSat as a Communication Relay for Venus Atmospheric Probes
UT – Floating LEAVES May Characterize Venus’s Ambiance
UT – Ambiance of Venus
UT – Venus has Clouds of Concentrated Sulfuric Acid, however Life May Nonetheless Survive

Lead Picture:
Mockup of the Demeter spacecraft, together with the deployment tubes for the LEAVES.
Credit score – Baxter et al.

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