Peregrine Mission One
Peregrine ahead of launch
Mission typeLunar landing and surface operations (initially planned), scientific experiments
OperatorAstrobotic Technology
COSPAR ID2024-006A
SATCAT no.58751
Mission duration8 days
(in progress)
One lunar day (14 Earth days) on the lunar surface (initially planned)
Spacecraft properties
SpacecraftPeregrine
Launch mass1,283 kg (2,829 lb)[1]
Start of mission
Launch date8 January 2024, 07:18:38 (2024-01-08UTC07:18:38Z) UTC
RocketVulcan Centaur VC2S
Launch siteCape Canaveral SLC-41
End of mission
Decay date18 January 2024 (anticipated)
Moon lander
Spacecraft componentPeregrine Lunar Lander
Landing date23 February 2024 (formerly planned)
Landing siteSinus Viscositatis (Bay of Stickiness, formerly planned)
Mission Patch
Mission Patch  

Peregrine Mission One, or the Peregrine Lunar Lander flight 01, is an American lunar lander built by Astrobotic Technology,[2] selected as a part of NASA's Commercial Lunar Payload Services (CLPS). Launched on 8 January 2024, at 2:18 am EST, by United Launch Alliance (ULA) aboard the maiden flight of the Vulcan Centaur,[3] it is the first US-built lunar lander launched since the crewed Lunar Module from the Apollo program. The lander carries multiple payloads, with a total payload mass capacity of 90 kg.[4] A fault occurred shortly after separation from the rocket, and the attempt to land on the Moon had to be abandoned.

History

Peregrine being rolled out to Space Launch Complex 41 atop a Vulcan Centaur on January 5, 2024

In July 2017, Astrobotic announced an agreement had been reached with United Launch Alliance (ULA) to launch their Peregrine lander aboard a Vulcan Centaur launch vehicle.[5] This first lunar lander mission, called Mission One, was initially to be launched in July 2021.[5][6]

On 29 November 2018, Astrobotic was made eligible to bid on NASA's Commercial Lunar Payload Services (CLPS) to deliver science and technology payloads to the Moon.[7]

In May 2019, Mission One received its first lander contract from NASA for 14 payloads.[8][9][10] It also had 14 commercial payloads, including small rovers from Hakuto, Team AngelicvM,[11] and a larger rover from Carnegie Mellon University, named Andy, which has a mass of 33 kg (73 lb) and is 103 cm (41 in) tall.[12] Another small rover, Spacebit, weighing 1.5 kg (3.3 lb), was designed to travel at least 10 m (33 ft) on four legs.[13][14][15][16] Other payloads include a library, in microprint on nickel, with Wikipedia contents and Long Now Foundation's Rosetta Project.[17][18] Space burial companies Elysium Space and Celestis paid Astrobotic to carry human remains.[19] The decision to include human remains was criticized by the Navajo Nation, whose president, Buu Nygren, argued that the Moon is sacred to the Navajo and other American Indian nations.[20][21]

In June 2021, United Launch Alliance CEO Tory Bruno announced that payload and engine-testing problems would delay the maiden flight of Vulcan Centaur, with Mission One aboard, to 2022.[22] On 23 February 2023, ULA announced an expected launch date for the mission of 4 May 2023.[23] After an anomaly during testing of the Vulcan Centaur on 29 March, the launch was delayed until June or July,[24] and then until late 2023.[25]

In early December 2023, Bruno said problems found during a wet dress rehearsal of the rocket would likely delay the launch until to the next launch window, on 8 January.[3]

Peregrine carries a maximum payload mass of 90 kg (200 lb) during Mission One,[26] and it was planned to land on Gruithuisen Gamma.[1]

The payload mass for the planned second mission (Mission Two) is capped at 175 kg (386 lb), and the Mission Three and later missions would carry the full payload capacity of 265 kg (584 lb).[1]

Lander

Astrobotic Peregrine lander

In 2016, Astrobiotics announced plans to build the Peregrine lander,[27] based on their previous concept lander, Griffin, which was larger but with the same payload capacity.[27][28] Astrobotic hired Airbus Defence and Space to help refine the lander's design.

The Peregrine bus is largely of aluminum alloy, and it is reconfigurable for specific missions. Its propulsion system has five thrusters built by Frontier Aerospace,[29] each producing 150 lb (667 N) thrust. This propulsion system was designed to handle the trans-lunar injection, trajectory corrections, lunar orbit insertion, and powered descent. The propulsion system can deliver an orbiter to the Moon and perform a powered soft landing.[1] The lander can carry up to 450 kg (990 lb) of bi-propellant mass in four tanks; its composition is MON-25/MMH, a hypergolic bi-propellant.[30] For attitude control (orientation), the spacecraft uses 12 thrusters (45 N each) also powered by MON-25/MMH.[1]

The spacecraft's avionics incorporate guidance and navigation to the Moon, and a Doppler LiDAR to assist the automated landing on four legs.[27] From Mission 2, its landing ellipse will be 100 m x 100 m, down from 24 km × 6 km previously.[1]

Peregrine is about 2.5 m wide and 1.9 m tall, and would have been able to deliver up to 265 kg (584 lb) of payload to the surface of the Moon.[27][31][1][32]

Its electrical systems are powered by a lithium-ion battery that is recharged by a solar panel made of GaInP/GaAs/Ge. Radiators and thermal insulators are used to dispose of excess heat, but the lander does not carry heaters, so the first few Peregrine landers are not expected to survive the lunar night,[1] which lasts 14 Earth days. Future missions could be adapted to do so.[1]

For communications to Earth, the lander uses frequencies within the X-band range for uplink as well as downlink.[1] After landing, a 2.4 GHz Wi-Fi modem is to enable wireless communication between the lander and deployed rovers on the lunar surface.[1]

Payloads

Lunar rovers

Country Name Agency or company Summary
 Mexico Colmena×5 Agencia Espacial Mexicana Agencia Espacial Mexicana (AEM), the Mexican Space Agency, will fly the first Latin American scientific instrument to the surface of the Moon. The payload consists of five small robots, weighing less than 60 grams and measuring 12 centimeters in diameter, will be catapulted onto the lunar surface.[33]
 United States Iris Carnegie Mellon University Carnegie Mellon University's Iris is a 2 kg rover designed by university students. Its shoebox-sized chassis and bottle-cap wheels are made from carbon fiber, a first for planetary robotics. Iris was designed to test small, lightweight rover mobility on the Moon, collect images for geological sciences, and gather UWB RF ranging data for testing new relative localization techniques.[34]

Instruments

Country Name Agency or company Summary
 United States Laser Retroreflector Array (LRA) NASA A retroreflector bounces any light that shines on it directly backward (180° from the incoming light). The LRA is a collection of eight of these, each a 1.25-cm diameter glass corner cube prism, all embedded in an aluminum hemisphere (painted gold) and mounted to the lander deck. It was designed to efficiently retroreflect laser signals from other orbiting and landing spacecraft over a wide range of incoming directions, thereby enabling precise measurement of the distance between the orbiting or landing spacecraft to the lander. The LRA was to function as a location marker on the Moon for decades. (Note: this LRA design is too small for laser ranging from the Earth).[35]
 United States Linear Energy Transfer Spectrometer (LETS) NASA Space radiation can harm astronauts on exploration missions outside the Earth's protective atmosphere, and more so on the Moon than in Low Earth Orbit (LEO). The first source of risk is the total radiation dose from Galactic Cosmic Rays, which is about twice as high on the lunar surface as in LEO. The second source of risk is from space weather events resulting from solar activity. The Linear Energy Transfer Spectrometer (LETS) is a radiation monitor that is derived from heritage hardware flown on Orion EFT-1 and slated to fly on the Orion EM-1 mission that will enable acquisition of knowledge of the lunar radiation environment and demonstrate the capabilities of a system on the lunar surface. The LETS radiation sensor is a solid-state silicon Timepix detector that is derived from heritage hardware that was flown on Orion EFT-1. This sensor will measure the rate of incident radiation providing, information that is critical to understanding and mitigating the hazardous environment that people will experience as they explore the surface of the Moon.[35]
 Germany M-42 Radiation Detector DLR This radiation detector is a complement to another scientific experiment riding aboard NASA's Artemis I mission. These sensors will precisely measure the level of radiation a human body will encounter on a trip to the Moon and back. The data from both Artemis I and Peregrine Missions will improve our understanding of lunar spaceflight environmental conditions with respect to astronaut health, as space radiation will be one of the key risks in the future of Human Space Exploration.[36]
 United States Navigation Doppler Lidar (NDL) NASA NDL is a LIDAR-based (Light Detection and Ranging) descent and landing sensor. This instrument operates on the same principles of radar but uses pulses of light from a laser instead of radio waves. NDL measures vehicle velocity (speed and direction) and altitude (distance to ground) with high precision during descent to touchdown.[37]
 United States Near-Infrared Volatile Spectrometer System (NIRVSS) NASA The payload includes a spectrometer context imager and a longwave calibration sensor. It measures surface and subsurface hydration (H2O and OH) and CO2 and methane (CH4) while simultaneously mapping surface morphology and surface temperature. The plan is for the measurements to take place during rover traverse when integrated onto a rover, throughout areas of targeted volatile investigation (called science stations), and during drilling activities. This instrument was created at NASA Ames Research Center. In total, it has three specific instruments: the near-infrared spectrometer, Ames imaging module, and longwave calibration sensor.[35]
 United States Neutron Spectrometer System (NSS) NASA The NSS instrument will determine the abundance of hydrogen-bearing materials and the bulk regolith composition at the landing site and measure any time variations in hydrogenous volatile abundance during the diurnal cycle. NSS can measure the total volume of hydrogen up to three feet below the surface, providing high-resolution ground truth data for measurements made from instruments in orbit around the Moon. NSS measures the number and energy of neutrons present in the lunar surface environment, which can be used to infer the amount of hydrogen present in the environment. This detection is possible because when neutrons strike a hydrogen atom, they lose a lot of energy.[35]
 United States Peregrine Ion-Trap Mass Spectrometer (PITMS) NASA PITMS will characterize the lunar exosphere after descent and landing, and throughout the lunar day, to understand the release and movement of volatile species. Previous missions have demonstrated the presence of volatiles at the lunar surface, but significant questions remain about the where those volatiles came from and how they are transported across the lunar surface. Investigating how the lunar exosphere changes over the course of a lunar day can provide insight into the transport process for volatiles on the Moon. The instrument has the ability to measure the low level of gases expected in the lunar exosphere and released by regolith interaction with surface disturbances, like rovers.

The PITMS sensor has direct heritage from the Ptolemy mass spectrometer that made the first in situ measurements of volatiles and organics on comet 67P with the Rosetta lander, Philae. PITMS operates in a passive sampling mode, where molecules fall into the zenith-facing aperture and are trapped by a radiofrequency field, then sequentially released for analysis. PITMS has a unit mass resolution up to an upper mass-to-charge (m/z) limit of 150 Da.

The PITMS investigation will provide time-resolved variability of OH, H2O, noble gases, nitrogen, and sodium compounds released from the soil and present in the exosphere over the course of a lunar day. PITMS observations will complement other instruments on board the Peregrine lander for a comprehensive approach to understanding the surface and exosphere composition, linking surface properties and composition to LADEE measurements from orbit, and providing a mid-latitude point of comparison for polar measurements planned by VIPER, PROSPECT, and other missions. The PITMS data provide a critical mid-latitude link to future polar mass specs to characterize the latitudinal migration of volatiles from equator to poles.

PITMS is a joint NASA-ESA project implemented by NASA's Goddard Space Flight Center (GSFC) and ESA's contractors Open University (OU) and STFC RAL Space, with coordination and support provided by ESA's Space Research and Technology Centre (ESTEC). The integrated PITMS payload and science investigation will be operated by GSFC with an international team of scientists.[35]

 United States Terrain Relative Navigation (TRN) Astrobotic Astrobotic will demonstrate its standalone Terrain Relative Navigation (TRN) sensor as a payload on its first mission to the Moon. TRN will enable spacecraft to perform landings on planetary surfaces with an unparalleled accuracy of less than 100 meters. The TRN sensor is being developed under a $10 million NASA Tipping Point contract with NASA Johnson Space Center, Jet Propulsion Laboratory, and Moog.[36]

Time capsules

Country Name Agency or company Type
 United States Bitcoin Magazine Genesis Plate BIT Inc. Plaque
 Germany DHL MoonBox DHL Commercial payload capsules
 Canada Lunar Codex[38] Incandence Artwork, books, stories, music
 United Kingdom Footsteps on the Moon Lunar Mission One Image bank
 United States Luna 02 Celestis Memorial capsule
 Seychelles Lunar Bitcoin BitMEX Cryptocurrency
 Japan Lunar Dream Capsule[39] Astroscale Time capsule
 United States Memorial Space Flight Services Elysium Space Memorial capsule
 Hungary Memory of Mankind on the Moon Puli Space Technologies Time capsule
 United States MoonArk Carnegie Mellon University Lunar Museum
 Argentina Your Photos on the Moon @andres Artwork
 United States The Arch Libraries Arch Mission Foundation Time capsule
 Canada  United States Writers on the Moon https://www.writersonthemoon.com Stories by 133 authors

Mission

Launch and trajectory

Launch of the Peregrine lunar lander on Vulcan Centaur's first flight

Peregrine was launched on 8 January 2024, at 2:18 am EST, on the inaugural flight of United Launch Alliance's Vulcan Centaur rocket, from Cape Canaveral Space Launch Complex 41.[40] The rocket was launched in the VC2S configuration, with two solid rocket boosters and a standard-length fairing. The solid rocket boosters separated from the vehicle at T+1 minute 50 seconds. The first stage continued firing its BE-4 engines until T+4:59 and separated a few seconds later. The Centaur upper stage started its first burn at T+5:15, which took more than 10 minutes to complete and put the vehicle into a low Earth orbit. Following a coast phase, the Centaur fired for the second time at T+43:35 to start the trans-lunar injection burn, which lasted about three minutes. The Peregrine lander separated from the rocket at T+50:26.[41]

Following its launch, Peregrine started a planned 46-day trajectory towards the Moon, during which it was expected to perform burns to enter orbit around the Moon and slowly approach the lunar surface. Landing was planned for 23 February 2024.[41]

Animation of Peregrine – Original plan
Around the Earth
Around the Moon
   Peregrine  ·    Moon ·    Earth

Propellant leak

Roughly seven hours after the launch, Astrobotic reported that a problem, likely with the propulsion system, had "prevented [the lander] from achieving a stable sun-pointing orientation".[42] The company conducted an unplanned maneuver of the spacecraft to turn the solar panels toward the Sun,[43] and, after an expected communications blackout, confirmed that the spacecraft was once again generating sufficient power. However, the problem was identified as a gradual propellant leak that required constant consumption of fuel to counteract. In a statement issued at 21:16 EST, Astrobotic said that thrusters were operating "well beyond their expected service life cycles" and that the "spacecraft could continue in a stable sun-pointing state for approximately 40 more hours" before it would run out of fuel, then lose attitude control and power.[44]

In a subsequent statement, the company confirmed that Peregrine could no longer land on the Moon, although it could continue to operate as a spacecraft.[45] Photographs taken by the spacecraft showed damage to the multi-layer insulation (MLI) on its exterior,[46][47] perhaps caused by a valve that failed to fully close, causing the oxidizer tank to rupture.[48]

Four days into the mission, the propellant leak appeared to slow, and Astrobotic reported that "there is growing optimism that Peregrine could survive much longer" than was previously anticipated.[44]

The spacecraft eventually reached a position that would have allowed it to reach the Moon with trajectory corrections.[49] But six days into the mission, Astrobotic decided instead to direct the spacecraft to burn up in Earth's atmosphere to avoid space debris.[50]

Future

Peregrine was the first of NASA's CLPS missions, with the second, Intuitive Machines' IM-1, set for launch in February 2024.[51] Astrobotic will have a second landing attempt, consisting of the larger Griffin lander and VIPER rover, with launch previously scheduled for November 2024.[52]

References

  1. 1 2 3 4 5 6 7 8 9 10 11 "Astrobotic – Payload User Guide". Astrobotic Technology. 2018. Archived from the original on 3 June 2019. Retrieved 10 December 2018.
  2. ↑ Chang, Kenneth (7 January 2024). "Vulcan Rocket's Inaugural Launch Carries Moon Lander to Space – Here's what you need to know about United Launch Alliance and the robotic lunar spacecraft it is sending to orbit". The New York Times. Archived from the original on 7 January 2024. Retrieved 8 January 2024.
  3. 1 2 Bruno, Tory (10 December 2023). "#VulcanRocket WDR update". X. Archived from the original on 10 December 2023. Retrieved 10 December 2023.
  4. ↑ "NASA – NSSDCA – Spacecraft – Details". nssdc.gsfc.nasa.gov. Archived from the original on 4 December 2023. Retrieved 31 October 2023.
  5. 1 2 SpaceX Falcon 9 Rocket Will Launch Private Moon Lander in 2021 Archived 4 October 2019 at the Wayback Machine Mike Wall, space.com, 2 October 2019
  6. ↑ "Astrobotic Awarded US$79.5 Million Contract to Deliver 14 NASA Payloads to the Moon" (Press release). Astrobotic Technology. 31 May 2019. Archived from the original on 4 September 2020. Retrieved 20 August 2019.
  7. ↑ "NASA Announces New Partnerships for Commercial Lunar Payload Delivery Services" (Press release). NASA. 29 November 2018. Archived from the original on 25 November 2020. Retrieved 29 November 2018. Public Domain This article incorporates text from this source, which is in the public domain.
  8. ↑ "NASA funds commercial Moon landers for science, exploration". Astronomy Now. 2 June 2018. Archived from the original on 8 June 2019. Retrieved 20 August 2019.
  9. ↑ Wall, Mike (1 June 2018). "These Are the Private Lunar Landers Taking NASA Science to the Moon". space.com. Archived from the original on 9 August 2019. Retrieved 20 August 2019. Peregrine will tote as many as 14 agency payloads to a big crater on the Moon's near side called Lacus Mortis by July 2021, on the lander's Mission One.
  10. ↑ Grush, Loren (5 June 2019). "This tiny rover will test how well small mobile robots can survive on the Moon". The Verge. Archived from the original on 13 August 2023. Retrieved 20 August 2019.
  11. ↑ Cole, Michael (19 March 2018). "Astrobotic Ready to Become Delivery Service to the Moon". Spaceflight Insider. Archived from the original on 21 October 2019. Retrieved 20 August 2019.
  12. ↑ "Andy's Mission". Planetary Robotics Lab. Carnegie Mellon University. Archived from the original on 3 February 2015. Retrieved 20 December 2018.
  13. ↑ Britain's first Moon rover is a four-legged robot that will explore lunar tunnels Archived 12 October 2019 at the Wayback Machine Ryan Browne, CNBC, 10 October 2019
  14. ↑ "SpaceBit Moon rover set to land on lunar surface in 2021". Sky News. 10 October 2019. Archived from the original on 10 January 2024. Retrieved 10 January 2024.
  15. ↑ A lunar rover which will explore the Moon on foot in 2021 was unveiled in London on Thursday Archived 10 October 2019 at the Wayback Machine Reuters, 10 October 2019
  16. ↑ UK's 1st Moon Rover to Launch in 2021 Archived 13 October 2019 at the Wayback Machine Mike Wall, space.com, 12 October 2019
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  24. ↑ Doughty, Nate (19 April 2023). "ULA rocket taking Astrobotic's lunar lander to space pushes back departure date following explosion during testing". bizjournals.com. Archived from the original on 19 April 2023. Retrieved 25 April 2023.
  25. ↑ Berger, Eric (14 June 2023). "Vulcan aces engine test, but upper stage anomaly will delay launch for a while "Working corrective action and retest."". Arstechnica. Archived from the original on 14 June 2023. Retrieved 14 June 2023.
  26. ↑ "Peregrine Lander". Astrobotic Technology. Archived from the original on 23 February 2017. Retrieved 5 June 2019.
  27. 1 2 3 4 Foust, Jeff (3 June 2016). "Astrobotic unveils Peregrine lunar lander". SpaceNews. Archived from the original on 17 October 2022. Retrieved 20 August 2019.
  28. ↑ "Griffin Lander". Astrobotic Technology. Archived from the original on 11 December 2018. Retrieved 10 December 2018.
  29. ↑ "Frontier Aerospace Selected for NASA Award to Develop Deep Space Thruster Using MON-25/MMH Propellant". Astrobotic Technology. Archived from the original on 1 October 2019. Retrieved 1 October 2019.
  30. ↑ "Aerojet Rocketdyne Successfully Demonstrates Low-Cost, High Thrust Space Engine" (Press release). Aerojet Rocketdyne. 23 May 2018. Archived from the original on 20 August 2019. Retrieved 20 August 2019.
  31. ↑ Foust, Jeff (13 June 2016). "Landers, laws, and lunar logistics". The Space Review. Archived from the original on 14 August 2019. Retrieved 20 August 2019.
  32. ↑ "Spacebit forms partnership, prepares to send tiny rover to the Moon". SpaceNews. 24 October 2019. Archived from the original on 17 October 2022. Retrieved 28 January 2020.
  33. ↑ "Moon Manifest | Astrobotic Technology". Archived from the original on 4 January 2024. Retrieved 3 January 2024.
  34. ↑ "IRIS Home". Archived from the original on 6 January 2024. Retrieved 3 January 2024.
  35. 1 2 3 4 5 "Task Order TO2-AB Scientific Payloads – NASA Science". Archived from the original on 7 December 2023. Retrieved 5 December 2023.
  36. 1 2 "Astrobotic — Launch Info Packet 5.8-1" (PDF). Archived (PDF) from the original on 30 November 2023. Retrieved 5 December 2023.
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  38. ↑ "A Time Capsule of Human Creativity, Stored in the Sky". The New York Times. 7 July 2023. Archived from the original on 27 July 2023. Retrieved 7 July 2023.
  39. ↑ "Otsuka's POCARI SWEAT Aims the Very First Moon Landing". businesswire.com. 15 May 2014. Archived from the original on 17 October 2022. Retrieved 6 February 2021.
  40. ↑ Foust, Jeff (8 January 2024). "Vulcan Centaur launches Peregrine lunar lander on inaugural mission". Spacenews. Archived from the original on 8 January 2024. Retrieved 8 January 2024.
  41. 1 2 McCrea, Aaron (8 January 2024). "Vulcan successfully launches Peregrine lunar lander on inaugural flight". NASASpaceFlight. Archived from the original on 8 January 2024. Retrieved 8 January 2024.
  42. ↑ Berger, Eric (8 January 2024). "Hours after its launch, a US lunar lander experiences an anomaly". Ars Technica. Archived from the original on 8 January 2024. Retrieved 8 January 2024.
  43. ↑ Tingley, Brett (8 January 2024). "Private Peregrine Moon lander suffers anomaly after historic Vulcan rocket launch, Astrobotic says". space.com. Archived from the original on 8 January 2024. Retrieved 8 January 2024.
  44. 1 2 Astrobotic [@astrobotic] (12 January 2024). "Update #13 [sic] for Peregrine Mission One: Peregrine has now been operational in space for more than 4 days. The spacecraft remains stable and operational, and is currently in a planned loss-of-signal period for about another hour and a half. The leak on Peregrine has continued to slow, and the spacecraft is estimated to now have 52 hours of propellant remaining. Our engineers continue to work on solutions to extend life expectancy and there is growing optimism that Peregrine could survive much longer than the current estimate" (Tweet) – via Twitter.
  45. ↑ Astrobotic [@astrobotic] (9 January 2024). "Update #7 for Peregrine Mission One: The Peregrine spacecraft has now been operational for about 32 hours. Overnight, the team faced another spacecraft pointing issue, but continues to persevere. The spacecraft started to tilt away from the Sun and reduced its solar power generation. The team was able to update the control algorithm and fix this issue. The batteries are at full charge. Given the proppellent leak, there is unfortunately, no chance of a soft landing on the Moon. However, we do still have enough propellant to continue to operate the vehicle as a spacecraft. The team has updated its estimates, and we currently expect to run out of propellant in about 40 hours from now - an improvement from last night's estimate. The team continues to work to find ways to extend Peregrine's operational life. We are in a stable operating mode and are working payload and spacecraft tests and checkouts. We continue receiving valuable data and proving spaceflight operations for components and software relation to our next lunar lander mission, Griffin" (Tweet) – via Twitter.
  46. ↑ Mike, Wall (8 January 2024). "1st photo from crippled private Peregrine moon lander holds clue to anomaly". space.com. Archived from the original on 10 January 2024. Retrieved 10 January 2024.
  47. ↑ Holmes, Oliver (9 January 2024). "Peregrine 1 has 'no chance' of landing on moon due to fuel leak". The Guardian. Archived from the original on 10 January 2024. Retrieved 10 January 2024. Astrobotic company says goal is now to get US spacecraft as far as possible before it loses power
  48. ↑ Wall, Mike (9 January 2024). "Stuck valve may have doomed private Peregrine moon lander mission, Astrobotic says". space.com. Archived from the original on 10 January 2024. Retrieved 10 January 2024.
  49. ↑ Astrobotic Technology (13 January 2024). "Update #15 for Peregrine Mission One". Twitter/X.
  50. ↑ Astrobotic Technology (14 January 2024). "Update #17 for Peregrine Mission One". Astrobotic. Retrieved 15 January 2024.
  51. ↑ Foust, Jeff (19 December 2023). "Intuitive Machines delays first lunar lander launch to February". SpaceNews. Archived from the original on 11 January 2024. Retrieved 20 December 2023.
  52. ↑ "NASA Replans CLPS Delivery of VIPER to 2024 to Reduce Risk". NASA. 18 July 2022. Archived from the original on 18 July 2022. Retrieved 18 July 2022.
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