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Questions tagged [lunar-orbit]

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Why Spacex Lunar Mission date postponed?

Previously SpaceX Lunar mission date was 2022, but it is mentioned in the wiki that it is no earlier than 2023. Why the date has been postponed?
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0answers
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Comparison of Lunar Orbiters image resolution after 4 decades?

The Lunar Orbiters, LO were launched 1966 and 1967. The Lunar Reconnaissance Orbiter, LRO was launched more than 40 years later in 2009. This paper has some information about the narrow angle camera ...
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1answer
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Better source for the 1967 photograph of Surveyor-1 by Lunar Orbiter-3?

In 1969 Apollo-12 Lunar Module pilot Alan L. Bean photographed Apollo 12 Commander Charles "Pete" Conrad Jr. standing next to Surveyor-3 because despite all of NASA's technological innovation that had ...
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1answer
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How to develop a photographic film in lunar orbit?

The Lunar Orbiter program was very successful in mapping the surface of the Moon. Images were taken on a 70 mm film, developed in a semidry process, and then scanned by a photomultiplier for ...
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1answer
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For an Apollo Lunar Module Ascent Stage launch, what is the optimal profile of $\beta$ (or $\gamma$) vs time?

When Apollo astronauts departed the lunar surface in the Lunar Module's Ascent Stage, it appeared to rise vertically ($\beta$ = 0) for ~10 seconds and then begin the "tipover" (videos of Apollo 15, 16 ...
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What would be needed for ISS to function in lunar orbit?

Not only the Chinese are rather unimpressed by the concept of "Lunar Gateway", which is summed up as a much smaller ISS in the Moon orbit. It made me wonder - wouldn't it be better to move ISS into ...
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2answers
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What is the official universal time system of Mars?

According to standing global treaty organizations specifications, 'What is the official universal time system of Mars?'
18
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2answers
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Going from LEO to lunar using only low-thrust ion propulsion - can it be done?

@SF.'s question What are the parameters of the new Iodine electrical rocket engine developed by RSC Energia? links to the short RT article 'Ten times cheaper': Russian space company testing iodine ...
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1answer
184 views

Why is Queqiao's dish antenna so big? (Chang'e-4 relay satellite) Largest ever on/near the Moon?

The NASA Spaceflight article Queqiao relay satellite launched ahead of Chang’e-4 lunar mission describes the communications relay satellite that will be used to communicate with Chang'e-4, which will ...
4
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2answers
203 views

Lunar Ascent Module Off-Center Thrust

I was recently told that for parts of the Lunar Module's ascent from the surface of the Moon to its rendezvous in orbit, its thrust vector was not in line with its center of gravity, and actually ...
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0answers
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Is there a “dusk-dawn” sun-synchronous lunar orbit? [duplicate]

Is it possible to have a Lunar "dusk-dawn" Sun-synchronous orbit, where a spacecraft can always be exposed to sunlight 24x7 over the terminator line?
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1answer
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What is a near rectilinear halo orbit?

A proposed option for the lunar orbit of a Lunar Orbital Platform-Gateway (formerly known as Deep Space Gateway) is a near rectilinear halo orbit, or NRHO. This excellent answer discusses the ...
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1answer
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Why is a near rectilinear halo orbit proposed for LOP-G (formerly known as Deep Space Gateway?)

Why is a near rectilinear halo orbit a good place for a Lunar Orbital Platform-Gateway (formerly known as Deep Space Gateway)? Are there specific logistical and orbital-mechanical advantages over ...
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0answers
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How much delta v is required to keep a low Lunar orbital station stable?

I'm interested in studying where in Lunar orbit a station could be deployed. Due to mascons, Lunar orbits below about 200km will eventually decay according to this answer. Presumably, if the goal of ...
3
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1answer
405 views

How does Exploration Mission 1 orbit differ from Apollo-era free-return? How far from Earth (and Moon) does it go?

I'm having trouble understanding the current orbit planned for NASA's Space Launch System's Exploration Mission 1. Is it possible to explain how the planned orbit works and what the maximum distance ...
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3answers
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What does it (actually) mean when spacecraft are “intentionally crashed” on the moon?

This List of Artificial Objects on the Moon lists 21 objects as "intentionally crashed". Because of the moon's lumpy gravity due to sub-surface mass concentrations most low lunar orbits will be fairly ...