Venus Express Spacecraft, Low On Fuel, Does Delicate Dance Above Doom Below

It’s been an interesting year for Venus Express. A few months ago, controllers deliberately dipped the spacecraft into the atmosphere of the planet — for science purposes, of course. The daring maneuver was approved because the spacecraft is near the end of its mission. It’s nearly out of fuel and will fall into Venus — sometime. Likely in 2015. No one knows exactly when, however.

Until Dec. 30, European Space Agency operators are going to boost the spacecraft’s orbit to try to get a little more productivity out of it. After that, all depends on what gas is left in the tank.

The push against the dense atmosphere revealed a few surprises. In a recent blog post, ESA said the atmosphere was changing more than expected. Between different altitudes, controllers sometimes saw a steady rise in pressure and sometimes multiple peaks. The spacecraft’s journeys took it as low as 129.2 kilometers (80 miles) above the surface, but mostly involving a month of “surfing” between 131 km and 135 km (81.4 miles and 83.9 miles).

Artist’s conception of Venus Express doing an aerobraking maneuver in the atmosphere in 2014. Credit: ESA–C. Carreau

“One possible explanation is that we detected atmospheric waves,” stated Håkan Svedhem, Venus Express project scientist.

“These features can be caused when high speed winds travel over mountain ranges. The waves then propagate upwards. However, such waves have never before been detected at such heights – twice the altitude of the cloud deck that blankets Venus.”

ESA observed that the atmospheric density increased 1,000 times between 165 km and 130 km (102.5 miles and 80.8 miles) and that it also changed when the spacecraft moved from day to night (specifically, it was four times greater on the sunlit side.) Measurements were also taken of high-energy particles and Venus’ magnetic fields, which are still being examined.

False colour composite of a ‘glory’ seen on Venus on 24 July 2011. The image is composed of three images at ultraviolet, visible, and near-infrared wavelengths from the Venus Monitoring Camera. The images were taken 10 seconds apart and, due to the motion of the spacecraft, do not overlap perfectly. The glory is 1200 km across, as seen from the spacecraft, 6000 km away. Credit: ESA/MPS/DLR/IDA.

But now, the end is indeed near for the spacecraft after eight years at Venus — four times longer than its primary mission. Although it is healthy and performing routine science operations, fuel is only standing at around 3 kilograms (6.6 pounds) and oxidizer at 5 kg (11 lbs). It’s possible not all of it is accessible due to propellant movement in the tanks, ESA said. The new maneuvers are expected to subtract 1.4 kg of fuel and 2 kg of oxidizer from these totals.

“Unfortunately, we do not know how much fuel remains in its tanks, but we are intending to continue the up-down process as long as possible, until the propellant runs out,” Svedhem added.

“We have yet to decide whether we shall simply continue until we lose control, allowing it to enter the atmosphere and burn up naturally, or whether we attempt a controlled descent until it breaks up.”

Source: European Space Agency (here and here)

Elizabeth Howell

Elizabeth Howell is the senior writer at Universe Today. She also works for Space.com, Space Exploration Network, the NASA Lunar Science Institute, NASA Astrobiology Magazine and LiveScience, among others. Career highlights include watching three shuttle launches, and going on a two-week simulated Mars expedition in rural Utah. You can follow her on Twitter @howellspace or contact her at her website.

Recent Posts

NASA Gets a Firm Grip on the Future of Space Exploration

As part of their ongoing mission to push the boundaries of space exploration, NASA’s cutting-edge…

2 hours ago

Yes, the Odds of an Asteroid Striking Earth Have Doubled. No, You Don’t Need to Worry

The odds of 2024 YR4 striking Earth in 2032 have doubled to 2.3%, but that's…

6 hours ago

Europa Clipper Tests its Star Tracker Navigation System

On October 14th, 2024, NASA's Europa Clipper mission launched atop a Falcon Heavy rocket from…

2 days ago

The Moon has Two Grand Canyons, Carved in Minutes by an Asteroid Impact

Our Moon continues to surprise us with amazing features. Scientists recently shared new information about…

3 days ago

Is Methane the Key to Finding Life on Other Worlds?

How would detecting methane help astronomers identify if exoplanets, or even exomoons, have life as…

3 days ago

Space Junk Could Re-Enter the Atmosphere in Busy Flight Areas

In the more than 60 years since the Space Age began, humans have sent more…

3 days ago