European Space Agency's Solar Orbiter completes its second flyby of Venus - just 33 hours before the BepiColombo spacecraft is set to swing by the planet
- Solar Orbiter flew by Venus this morning, coming 5,000 miles from the planet
- BepiColombo will fly by on August 10, coming 340 miles from Venus surface
- They are both heading to the inner solar system, using Venus for gravity assist
- Even though both spacecraft will be flying within a few thousand miles of Venus and just a day apart, they will be separated by over 350,000 miles of open spaceThe European Space Agency's Solar Orbiter spacecraft has made its second flyby of Venus, just 33 hours before the BepiColombo craft makes its close approach.
They are both using the gravitational pull of Venus to help them drop a little bit of orbital energy to reach their destinations at the centre of the solar system.
Solar Orbiter is on its way to study the polar regions of the sun in a bid to better understand its 11-year cycle, and made its approach at 05:42 BST, ESA said, coming within 4,967 of the planet. ESA's New Norcia monitoring station in Australia lost contact with the solar orbit for six minutes, as expected.
ESA tweeted: 'A few minutes ago, as the spacecraft swung behind the planet for its Venus Flyby, New Norcia station lost contact as expected.'
Six minutes later, it regained contact, writing: 'New Norcia has you in sight again - we're back in contact!'
BepiColombo is heading to Mercury on a seven year mission to study the structure and atmosphere of the innermost planet in the solar system and makes its approach to Earth's 'evil twin' tomorrow at 14:42 BST.
The double flyby offers ESA astronomers a chance to study Earth's sister-planet Venus from different locations at the same time, and places rarely visited by probes.
They are both using the gravitational pull of Venus to help them drop a little bit of orbital energy to reach their destinations at the centre of the solar system
The double flyby offers ESA astronomers a chance to study Earth's sister-planet Venus from different locations at the same time, and places rarely visited by probes
Solar Orbiter is a partnership between ESA and NASA to study the polar regions of our host star.
This isn't the first time the sun-observing satellite has visited Venus.
It is scheduled to make repeated gravity assist flybys of the planet throughout its mission in its bid to get close to the star at the heart of the solar system.
During the Venus flybys it is changing its orbital inclination.
While doing this, it is acting to boost itself out of the ecliptic plane, to get the best – and first – views of the sun's poles.
BepiColombo is a partnership between ESA and the Japanese space agency JAXA.
It will fly by Venus at 14:48 BST on August 10, coming just 340 miles from the surface of the planet.
The probe is on its way to the mysterious innermost planet of the solar system, Mercury.
To get there it has required flybys of Earth, Venus and even Mercury itself to get close enough.
These flybys, coupled with the spacecraft's solar electric propulsion system is what is required to steer into Mercury orbit against the gravitational pull of the sun.
It is not possible to take high-resolution imagery of Venus with the science cameras onboard either mission, so there won't be new pictures of Earth's 'evil twin'. Solar Orbiter must remain facing the sun, and the main camera onboard BepiColombo is shielded by the transfer module that will deliver the two planetary orbiters to Mercury, according to ESA officials.
However, two of BepiColombo's three monitoring cameras will be taking photos around the time of close approach and in the days after as the planet fades.
The cameras provide black-and-white snapshots in 1024 x 1024 pixel resolution, and are positioned on the Mercury Transfer Module such that they also capture the spacecraft's solar arrays and antennas.
BepiColombo, a partnership between ESA and the Japanese space agency JAXA, will fly by Venus at 14:48 BST on August 10, coming just 340 miles from the surface of the planet
During the closest approach, Venus will fill the entire field of view, but as the spacecraft changes its orientation the planet will be seen passing behind the panels.
The images will be downloaded in batches, one by one, with the first image expected to be available in the evening of August 10, and the majority on August 11.
Even though both spacecraft will be flying within a few thousand miles of Venus and just a day apart, they will be separated by over 350,000 miles of open space.
'It is – unfortunately! – not expected that one spacecraft will be able to image the other,' the European agency said in a blog post.
Solar Orbiter has been acquiring data near-constantly since launch in February 2020 with its four instruments that measure the environment around the spacecraft itself.
Both Solar Orbiter and BepiColombo's Mercury Planetary Orbiter and Mercury Magnetospheric Orbiter will collect data on the magnetic and plasma environment of Venus from different locations.
At the same time, JAXA's Akatsuki spacecraft is in orbit around Venus, creating a unique constellation of datapoints.
It will take many months to collate the coordinated flyby measurements and analyse them in a meaningful way, so information won't be available straight away.
The data collected during the flybys will also provide useful inputs to ESA's future Venus orbiter, EnVision, which will launch to the planet in the 2030s.
Solar Orbiter and BepiColombo both have one more flyby of Venus this year.
Solar Orbiter, a partnership between ESA and NASA, will fly by Venus on August 9, coming about 5,000 miles from the planet at 05:42 BST that morning
BepiColombo will see Mercury for the first time overnight on October 1, making its first of six flybys of Mercury – with this one from just just over 100 miles.
The two planetary orbiters will be delivered into Mercury orbit in late 2025, tasked with studying all aspects of this mysterious inner planet.
This includes its core to surface processes, magnetic field, and exosphere, to better understand the origin and evolution of a planet close to its parent star.
On November 27, Solar Orbiter will make a final flyby of Earth, coming just under 300 miles from the surface, kicking off the start of its main mission.
Even though both spacecraft will be flying within a few thousand miles of Venus and just a day apart, they will be separated by over 350,000 miles of open space
Both NASA and the European Space Agency are sending spacecraft to study Venus in more detail in the 2030s, where they will explore how it became so different to the Earth, despite having a similar origin
It will continue to make regular flybys of Venus to progressively increase its orbit inclination to best observe the sun's uncharted polar regions.
Solar scientists say understanding and imaging the polar regions of our star is key to understanding its 11 year activity cycle.
Both NASA and the European Space Agency are sending spacecraft to study Venus in more detail in the 2030s, where they will explore how it became so different to the Earth, despite having a similar origin.
No comments: