Rajan Wilcox
The James Webb Space Telescope (JWST) is a NASA mission that was launched on December 25, 2021. It has been noted that the telescope has enough maneuvering fuel for between 5 and 10 years. However, due to the precision of the launch trajectory and mid-course correction, the telescope is expected to have enough propellant for 20 years of science, according to Mike Menzel, the Lead Mission Systems Engineer for the James Webb Space Telescope.
| Characteristics | Values |
|---|---|
| Fuel type | Hydrazine fuel and dinitrogen tetroxide as oxidizer |
| Fuel volume | 159 liters or 42 U.S. gallons of hydrazine fuel and 79.5 liters or 21.0 US gallons of dinitrogen tetroxide at launch |
| Fuel duration | 5-10+ years, likely 20 years |
| Fuel conservation | Fuel saved due to accurate launch and mid-course correction |
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What You'll Learn
The James Webb Space Telescope has enough fuel for 5-10+ years
The James Webb Space Telescope, which was launched on December 25, 2021, has enough fuel for 5 to 10 or more years. The telescope was designed to carry enough fuel for ten years, but the precision of the Ariane 5 launch and the first mid-course correction saved enough onboard fuel that the observatory should be able to maintain its orbit for "significantly more" than this. The telescope has completed two of the three burns required to see it to its final destination, with the final burn taking place nearly a month after launch. The accuracy of the launch trajectory also allowed for the timely deployment of the solar array, which occurred about a minute and a half after separation from the Ariane 5 second stage.
The James Webb Space Telescope is NASA's flagship general-purpose telescope in space, succeeding the highly successful Hubble Telescope. It is currently on its way to an insertion location about 930,000 miles (1.5 million kilometers) away from our planet, where it will fire its engines to glide to a "parking spot" called Earth-sun Lagrange Point 2 (L2). This Lagrange point is balanced between the gravitational forces of the sun, Earth, and moon, allowing the telescope to stay steady while using a minimum of fuel.
The telescope has rocket propellant onboard not only for mid-course correction and insertion into orbit around L2 but also for necessary functions during the life of the mission, including "station-keeping" maneuvers and momentum management. The extra propellant is largely due to the precision of the Ariane 5 launch, which exceeded the requirements needed to put Webb on the right path, as well as the precision of the first mid-course correction maneuver. A second correction maneuver occurred on December 27, adding around 6.3 mph (2.8 meters/sec) to the speed.
The James Webb Space Telescope has a mission to explore the universe in the infrared spectrum, the perfect wavelength of light for viewing the most distant and, therefore, the earliest parts of the universe. It will hunt for the faintest galaxies from just after the birth of our universe, acting as both a telescope and a time machine. Astronomers will also use Webb to observe how stars and planets form, peer into the supermassive black hole at the center of our galaxy, measure the chemical properties of exoplanets, and even observe planets within our solar system.
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The telescope's lifespan may exceed 10 years
The James Webb Space Telescope (JWST) was launched on 25 December 2021 on an Ariane 5 rocket from Kourou, French Guiana. It arrived at its destination in January 2022, and its first image was released to the public on 11 July 2022. The telescope is designed to conduct infrared astronomy and is equipped with high-resolution and high-sensitivity instruments, allowing it to view objects that are too old, distant, or faint for the Hubble Space Telescope.
The lifespan of the telescope may exceed 10 years due to several factors. Firstly, the telescope was designed to carry enough fuel for a lifespan of 10 years. However, the precision of the Ariane 5 launch and the first midcourse correction meant that less fuel was needed to correct the telescope's trajectory toward its final orbit. As a result, the telescope will have more fuel left in its tank than initially expected, allowing it to maintain its orbit for significantly longer than 10 years.
Additionally, the telescope has a limited supply of liquid helium, which is necessary to keep the telescope super-cooled and sensitive to infrared radiation. While the telescope will slowly leak helium over time, it is possible to extend its lifespan by sending an unmanned resupply craft with more liquid helium. Furthermore, the telescope was built with a fueling port, which could potentially be used to refuel the telescope in the future.
The telescope's lifespan may also be extended through the use of "maintenance satellites," which could service, refuel, and course-correct the telescope. While this technology is still in its early phases, it is possible that it will be available within the telescope's initial 10-year lifespan, allowing for further extensions.
Finally, the telescope's lifespan may be influenced by its scientific impact and the availability of funding for extensions or repairs. The telescope has already revealed new insights into the early universe and the formation of galaxies, and it is likely that further discoveries will be made throughout its lifespan. The availability of funding for repairs or extensions could also impact the telescope's lifespan, although presently, no money is budgeted for such purposes.
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Webb's fuel is hydrazine
The James Webb Space Telescope, launched on December 25, 2021, is equipped with 159 litres of hydrazine fuel and 79.5 litres of dinitrogen tetroxide oxidiser. The telescope's fuel system is designed to provide sufficient propulsion and manoeuvring capabilities for its scientific mission. Webb's fuel system plays a crucial role in achieving and maintaining its operational orbit about 1 million miles away from Earth.
Hydrazine, a highly toxic substance, is used as a long-term storable propellant for in-space spacecraft propulsion. It has a history of application in rocket fuels, dating back to World War II. Its ability to reduce the concentration of dissolved oxygen and control the pH of water makes it valuable in industrial boilers and spacecraft propulsion systems. Hydrazine is also utilised in the pharmaceutical and agrochemical industries, as well as in the preparation of gas precursors for airbags.
The selection of hydrazine as Webb's fuel is based on its suitability for the specific requirements of the mission. Its toxic nature demands careful handling, which was evident during the fuelling process, where technicians wore protective suits. The choice of hydrazine also reflects the need for a propellant that can be efficiently stored and handled, contributing to the overall success of the mission.
The precise amount of fuel loaded onto the telescope, including both hydrazine and the oxidiser, was calculated to meet the mission's duration and operational needs. With the efficient launch and trajectory correction, the Webb telescope is expected to have enough fuel for significantly more than the baseline estimate, potentially exceeding 20 years of mission life. This extended fuel capacity is a positive outcome of the precise insertion by Ariane 5 and the effective correction burns during the telescope's journey to its final orbit.
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Webb's fuel was used for three MCC course correction burns
The James Webb Space Telescope, launched on December 25, 2021, is NASA's flagship general-purpose telescope in space. It was designed to carry enough fuel for ten years, but the precision of the Ariane 5 launch and the first mid-course correction (MCC) burn saved enough onboard fuel to maintain its orbit for "significantly more" than this. The first MCC burn, MCC-1A, was completed on December 26, 2021, and was about 20 minutes shorter than planned, which helped to save fuel.
The Webb telescope has thrusters only on the warm, Sun-facing side of the observatory. This means that the thrusters can only push Webb away from the Sun, not back toward it or the Earth. Therefore, the Ariane 5 launch insertion and the MCCs are designed to always keep the telescope on the uphill side of the gravitational potential. This ensures that the telescope does not drift away downhill on the other side, from which it would have no ability to return. MCC-1A was executed to take out most, but not all, of the total required correction to ensure that this burn would not overshoot.
MCC-1B was scheduled for 2.5 days after launch, and MCC-2 was scheduled for about 29 days after launch. The three MCC course correction burns have totalled 24.4 m/s fuel used in burns totalling 79.5 minutes. The telescope started out with 150 m/s worth of thruster fuel, of which 2-4 m/s are expected to be used annually for station-keeping.
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Webb's fuel is for functions like station keeping
The James Webb Space Telescope (JWST) is a space telescope designed to conduct infrared astronomy. As the largest telescope in space, it is equipped with high-resolution and high-sensitivity instruments, allowing it to view objects that are too old, distant, or faint for the Hubble Space Telescope to see. The JWST has enough maneuvering fuel for between 5 and 20 years. The telescope circles the Sun-Earth L2 point in a halo orbit, which is inclined with respect to the ecliptic and takes about half a year to complete.
Orbital station-keeping is the process of keeping a spacecraft at a fixed distance from another spacecraft or celestial body. For the JWST, station-keeping involves maintaining its halo orbit around the L2 point. This requires small adjustments to keep the telescope in its desired orbit and counteracting the effects of solar radiation pressure on the huge sunshield. The precision of the Ariane 5 launch and the first midcourse correction saved enough onboard fuel that the JWST may be able to maintain its orbit for around 20 years.
The JWST uses propellant for station-keeping to prevent the telescope from drifting away from its orbital position. The propellant requirements for station-keeping are approximately 2.5 m/s per year, with a total delta-v budget of 93 m/s. The telescope's propulsion system consists of two sets of thrusters located on the Sun-facing side of the observatory. The thrusters are designed to slightly undershoot the required amount of thrust to avoid pushing the telescope beyond the semi-stable L2 point, from which it would not be able to recover.
The JWST's orbit provides a wide view of the cosmos and allows its telescope optics and scientific instruments to get cold enough to function optimally. The halo orbit also keeps the telescope out of the Earth and Moon's shadow, allowing it to simultaneously block incoming heat and light from the Sun, Earth, and Moon. This helps to maintain a constant temperature and avoid interruptions during observations. The fuel efficiency of the propulsion system is crucial for the JWST's mission, and the use of plasma or ion thrusters can help extend the lifetime of the mission.
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Frequently asked questions
The James Webb Space Telescope has enough maneuvering fuel for between 5 and 20 years.
Webb was designed to carry enough fuel for 10 years, but due to the precision of the Ariane 5 launch, it is expected to last much longer.
The Ariane 5 launch and the first mid-course correction saved enough onboard fuel for the observatory to maintain its orbit for "significantly more" than 10 years.
The three MCC course correction burns totaled 24.4$\frac{m}{s}$ fuel used in 79.5 minutes.
The engines of Webb use hydrazine fuel and dinitrogen tetroxide as an oxidizer.
