NEO Surveyor
Names | Near-Earth Object Surveillance Mission Near-Earth Object Camera NEOCam |
---|---|
Mission type | Asteroid impact avoidance, astronomy |
Operator | NASA / JPL |
COSPAR ID | |
Website | https://www.ipac.caltech.edu/project/neo-surveyor |
Mission duration | 12 years (planned) |
Spacecraft properties | |
Manufacturer | Jet Propulsion Laboratory |
Launch mass | 1,300 kg (2,900 lb) |
Start of mission | |
Launch date | 2026 (planned) |
Orbital parameters | |
Reference system | Heliocentric orbit |
Regime | Sun–Earth L1 |
Main telescope | |
Diameter | 50 cm (20 in) |
Wavelengths | Infrared (4–5.2 and 6–10 µm) |
NEO Surveyor, formerly called Near-Earth Object Camera (NEOCam), then NEO Surveillance Mission, is a planned space-based infrared telescope designed to survey the Solar System for potentially hazardous asteroids.
The NEO Surveyor spacecraft will survey from the Sun–Earth L1 (inner) Lagrange point, allowing it to look close to the Sun and see objects inside Earth's orbit. The mission will be a successor to the NEOWISE mission; the principal investigator is also NEOWISE's principal investigator, Amy Mainzer at the University of Arizona.
Since first proposed in 2006, the concept unsuccessfully competed repeatedly for NASA funding against science missions unrelated to planetary defense, despite a 2005 US Congressional directive to NASA. In 2019, the Planetary Defense Coordination Office decided to implement this mission due to its national security implications. On 11 June 2021, NASA authorized the NEO Surveyor mission to proceed to the preliminary design phase. The Jet Propulsion Laboratory will lead development of the mission.
History
In 2005, the U.S. Congress mandated NASA to achieve by the year 2020 specific levels of search completeness for discovering, cataloging, and characterizing dangerous asteroids larger than 140 m (460 ft) (Act of 2005, H.R. 1022; 109th), but it never appropriated specific funds for this effort. NASA did not prioritize this mandate, and directed the NEOCam project to compete for funds against science missions unrelated to planetary defense or disaster mitigation planning.
Proposals for NEOCam were submitted to NASA's Discovery Program in 2006, 2010, 2015, 2016 and 2017, but each time were not selected for launch. The mission concept nonetheless received technology development funding in 2010 to design and test new infrared detectors optimized for asteroid and comet detection and sizing. The project received additional funding for further technological development in September 2015 (US$3 million), and in January 2017.
Following calls to fully fund the mission outside NASA's Planetary Science Division or directly from Congress itself, it was announced on 23 September 2019 that instead of competing for funding, NEOCam will be implemented under the name NEO Surveillance Mission with budget from NASA's Planetary Defense Coordination Office, within the Planetary Science Division. The near-miss of asteroid 2019 OK, which slipped past extant detection methods in July 2019, has been suggested to have helped prompt this decision.
For funding and management purposes, the NEO Surveillance Mission is officially a new project, but it is the same space telescope, the same team, and the mission's goals remain unchanged.
Objectives
The main objective of the mission is to discover and characterize the orbit of most of the potentially hazardous asteroids larger than 140 m (460 ft) over the course of its mission. Its field of view will be large enough to allow the mission to discover tens of thousands of new NEOs with sizes as small as 30 m (98 ft) in diameter. Secondary science goals include detection and characterization of approximately one million asteroids in the asteroid belt and thousands of comets, as well as identification of potential NEO targets for human and robotic exploration.
The Jet Propulsion Laboratory (JPL) will lead development of the mission. The total cost of the mission is estimated to be between US$500 million and US$600 million.
Spacecraft
The NEO Surveyor spacecraft will have a total mass of no more than 1,300 kg (2,900 lb), allowing it to launch on a vehicle like a Atlas V or Falcon 9 Block 5 to the Sun–Earth L1 Lagrange point. The mission should reach the 90% congressional goal within 10 years, with an anticipated mission lifetime of 12 years.
Telescope and camera
Most asteroids are black. Small ones are difficult to see in the blackness of outer space with an optical telescope, but a telescope operating at infrared wavelengths is sensitive to asteroids whose surfaces have been warmed by the Sun.
The NEO Surveillance Mission will employ a 50 cm (20 in) infrared telescope operating wide-field cameras at two thermal infrared wavelength channels for a total wavelength range between 4 µm and 10 µm. Its field of view is 11.56 square degrees. It will use a modified version of the HgCdTe Astronomical Wide Area Infrared Imager (HAWAII) mercury–cadmium–telluride detector developed by Teledyne Imaging Sensors. The mission prototype detector was successfully tested in April 2013. The detector array is 2,048 × 2,048 pixels and will produce 82 gigabits of data per day. For good infrared performance without the use of cryogenic fluid refrigeration, the detector will be passively cooled to 30 K (−243.2 °C; −405.7 °F) using techniques proven by the Spitzer Space Telescope. This means that unlike its predecessor NEOWISE, it will not suffer from a performance degradation due to running out of coolant (it does still have a limited mission duration however as it needs to use propellant for orbital station keeping in order to maintain its position at SEL1).
Operations
The NEO Surveyor spacecraft will operate in a halo orbit around the Sun–Earth L1, and employ a sunshade. This orbit will allow fast data downlink speeds to Earth, allowing full-frame images to be downloaded from the telescope.
Images
See also
- Asteroid impact prediction
- Asteroid impact avoidance
- List of largest infrared telescopes
- List of near-Earth object observation projects
- Wide-field Infrared Survey Explorer (WISE & NEOWISE)
- List of proposed space observatories
- NEOs search projects
- B612 Foundation, an organization that studied NEOs and proposed a similar mission
- Sentinel Space Telescope, B612's failed space telescope proposal similar to NEOSM
- Near Earth Object Surveillance Satellite, a Canadian small satellite intended to detect NEOs
- The Spaceguard Foundation, an organization that attempts to locate NEOs
- Whipple (spacecraft), a proposed space telescope in the Discovery program
- Asteroid Terrestrial-impact Last Alert System, a ground-based NEO detection system funded by NASA since the end of 2015