NASA to Change How It Points Hubble Space Telescope

After completing a series of tests and carefully considering the options, NASA announced Tuesday work is underway to transition its Hubble Space Telescope to operate using only one gyroscope (gyro). While the telescope went into safe mode May 24, where it now remains until work is complete, this change will enable Hubble to continue exploring the secrets of the universe through this decade and into the next, with the majority of its observations unaffected.

Of the six gyros currently on the spacecraft, three remain active. They measure the telescope’s slew rates and are part of the system that determines and controls the direction the telescope is pointed. Over the past six months, one particular gyro has increasingly returned faulty readings, causing the spacecraft to enter safe mode multiple times and suspending science observations while the telescope awaits new instructions from the ground.

This one gyro is experiencing “saturation,” where it indicates the maximum slew rate value possible regardless of how quickly the spacecraft is slewing. Although the team has repeatedly been able to reset the gyro’s electronics to return normal readings, the results have only been temporary before the problem reappears as it did again in late May.

To return to consistent science operations, NASA is transitioning the spacecraft to a new operational mode it had long considered: Hubble will operate with only one gyro, while keeping another gyro available for future use. The spacecraft had six new gyros installed during the fifth and final space shuttle servicing mission in 2009. To date, three of those gyros remain operational, including the gyro currently experiencing problems, which the team will continue to monitor. Hubble uses three gyros to maximize efficiency but can continue to make science observations with only one gyro. NASA first developed this plan more than 20 years ago, as the best operational mode to prolong Hubble’s life and allow it to successfully provide consistent science with fewer than three working gyros. Hubble previously operated in two-gyro mode, which is negligibly different from one-gyro mode, from 2005-2009. One-gyro operations were demonstrated in 2008 for a short time with no impact to science observation quality.

While continuing to make science observations in one-gyro mode, there are some expected minor limitations. The observatory will need more time to slew and lock onto a science target and won’t have as much flexibility as to where it can observe at any given time. It also will not be able to track moving objects closer than Mars, though these are rare targets for Hubble.

The transition involves reconfiguring the spacecraft and ground system as well as assessing the impact to future planned observations. The team expects to resume science operations again by mid-June. Once in one-gyro mode, NASA anticipates Hubble will continue making new cosmic discoveries alongside other observatories, such as the agency’s James Webb Space Telescope and future Nancy Grace Roman Space Telescope, for years to come.

Launched in 1990, Hubble has more than doubled its expected design lifetime, and has been observing the universe for more than three decades, recently celebrating its 34th anniversary. Read more about some of Hubble’s greatest scientific discoveries.

Learn more about NASA’s Hubble Space Telescope on the agency’s website:

https://www.nasa.gov/hubble

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Media Contact:

Claire Andreoli
NASA’s Goddard Space Flight Center, Greenbelt, MD
claire.andreoli@nasa.gov

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NASA Astronauts Practice Next Giant Leap for Artemis 

The physics remain the same, but the rockets, spacecraft, landers, and spacesuits are new as NASA and its industry partners prepare for Artemis astronauts to walk on the Moon for the first time since 1972.

NASA astronaut Doug “Wheels” Wheelock and Axiom Space astronaut Peggy Whitson put on spacesuits, developed by Axiom Space, to interact with and evaluate full-scale developmental hardware of SpaceX’s Starship HLS (Human Landing System) that will be used for landing humans on the Moon under Artemis. The test, conducted April 30, marked the first time astronauts in pressurized spacesuits interacted with a test version of Starship HLS hardware.

“With Artemis, NASA is going to the Moon in a whole new way, with international partners and industry partners like Axiom Space and SpaceX. These partners are contributing their expertise and providing integral parts of the deep space architecture that they develop with NASA’s insight and oversight,” said Amit Kshatriya, NASA’s Moon to Mars program manager. “Integrated tests like this one, with key programs and partners working together, are crucial to ensure systems operate smoothly and are safe and effective for astronauts before they take the next steps on the Moon.”

The day-long test, conducted at SpaceX headquarters in Hawthorne, California, provided NASA and its partners with valuable feedback on the layout, physical design, mechanical assemblies, and clearances inside the Starship HLS, as well as the flexibility and agility of the suits, known as the AxEMU (Axiom Extravehicular Mobility Unit).

To begin the test, Wheelock and Whitson put on the spacesuits in the full-scale airlock that sits on Starship’s airlock deck. Suits were then pressurized using a system immediately outside the HLS airlock that provided air, electrical power, cooling, and communications to the astronauts. Each AxEMU also included a full-scale model of the Portable Life Support System, or “backpack,” on the back of the suits. For Artemis moonwalks, each crew member will put on a spacesuit with minimal assistance, so the team was eager to evaluate how easily the suits can be put on, taken off, and stowed in the airlock.

During the test, NASA and SpaceX engineers were also able to evaluate placement of mobility aids, such as handrails, for traversing the hatch. Another set of mobility aids, straps hanging from the ceiling in the airlock, assisted the astronauts when entering and removing the AxEMU suits. The astronauts also practiced interacting with a control panel in the airlock, ensuring controls could be reached and activated while the astronauts were wearing gloves.

“Overall, I was pleased with the astronauts’ operation of the control panel and with their ability to perform the difficult tasks they will have to do before stepping onto the Moon,” said Logan Kennedy, lead for surface activities in NASA’s HLS Program. “The test also confirmed that the amount of space available in the airlock, on the deck, and in the elevator, are sufficient for the work our astronauts plan to do.”

The suited astronauts also walked the from Starship’s airlock deck to the elevator built for testing. During Artemis missions, the elevator will take NASA astronauts and their equipment from the deck to the lunar surface for a moonwalk and then back again. Whitson and Wheelock practiced opening a gate to enter the elevator while evaluating the dexterity of the AxEMU suit gloves, and practiced lowering the ramp that astronauts will use to take the next steps on the Moon.

The steps the astronauts took in the spacesuits through full-scale builds of the Starship hatch, airlock, airlock deck, and elevator may have been small, but they marked an important step toward preparing for a new generation of moonwalks as part of Artemis.

For the Artemis III mission, SpaceX will provide the Starship HLS that will dock with Orion in lunar orbit and take two astronauts to and from the surface of the Moon. Axiom Space is providing a new generation of spacesuits for moonwalks that are designed to fit a wider range of astronauts.

With Artemis, NASA will explore more of the Moon than ever before, learn how to live and work away from home, and prepare for future human exploration of the Red Planet. NASA’s SLS (Space Launch System) rocket, exploration ground systems, and Orion spacecraft, along with the human landing system, next-generation spacesuits, Gateway lunar space station, and future rovers are NASA’s foundation for deep space exploration.

For more information about Artemis, visit:

https://www.nasa.gov/artemis

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Lee Mohon