Questions tagged [deep-space]

Questions about deep space travel and observations that are related to the distance between the object in question and the Earth. For example, questions about communications delay, radial resolution, means of propulsion through the interstellar medium, e.t.c. Deep space does not exclude space near or around other celestial bodies past our Solar system's heliosphere, and should not be confused with the term "interstellar".

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7
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256 views

How did NASA refer to dates and times of a mission in the 1970s?

Back in the 1970s, how did NASA describe when an event happened during a mission? For example, when Mariner 10 did its fly-by of Venus, how did the Mariner team refer to that moment in time? Did ...
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103 views

Why are modern satellite ground station and deep space communications dishes with secondary mirrors almost always Cassegrain?

The simplest dish antennas have a concave reflector and their feed horns at the primary focus which is "up in the air". That has several inconveniences, it's hard to go up there to do any ...
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128 views

When, if ever, did deep space probes start using encryption?

What, if any, mechanisms prevent unauthorized commands? Asks what measures are taken for spacecraft, although the answer doesn't go much farther than pointing to the What would one need to do in order ...
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113 views

How much more does it cost to produce two identically designed probes/rovers/satellites compared to making only one?

There are a number of historical planetary missions that have produced 2 flying instances. Examples include Voyager, Viking, MERS, some of the Mariners missions. Other missions have only one ...
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51 views

Currently, how many communications channels can a single DSN dish maintain at the same time? Are there plans to increase this in the future?

DSN NOW screenshot 2021-07-10 at 07:14 UTC DSN NOW screenshot 2021-07-10 at 09:48 UTC The screen shots show Canberra's Dish 35 simultaneously transmitting and receiving, and above it is written MRO, ...
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138 views

Where can I read about Lucy's complete propulsion system?

Wikipedia's /Lucy (spacecraft) says nothing of propulsion, and it's SWRI home page for the spacecraft http://lucy.swri.edu/mission/Spacecraft.html gives specification and enumerates what's on Lucy’s ...
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46 views

Curiosity / MRO UHF connection and weak signal modulation

In the case of MRO and Curiosity communications via UHF, an active feedback system was implemented in which Curiosity monitored the quality/SNR of the connection and commanded Curiosity to increase / ...
4
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117 views

What approximate bitrate is required for interplanetary spacecraft GNC?

What is a rough estimate for the bitrate needed for GNC (guidance, navigation, and control) of an interplanetary spacecraft from Earth? I know it varies a great deal from case to case, but I want an ...
4
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205 views

Do ring laser gyros age with laser and dithering disabled?

Laser fading seems to be a known issue with ring laser gyros. With their STEREO-B probe, NASA experienced a different, "unexpected" failure mode, giving false readings. The Honeywell MIMU's were well ...
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311 views

Are Solid State Hard Drives in space made from radiation-hardened FLASH memory, or do they just use older technology with higher voltage and charge?

Answers to Why is the James Webb Space Telescope's data storage space so small? have got me thinking. Solid State Hard Drives (SSDs) are usually made from FLASH memory though alternatives like ...
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26 views

When are close approaches of Helios 1 and 2 to the Earth? Any historical tracking data? Any reports in sky surveys?

This answer to ** notes that it's hard to get current data on the orbits of Helios-1 and Helios-2 and I couldn't find any in JPL's Horizons. They are shiny and in nice elliptical orbits between ...
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74 views

How effective is the Orion radiation protection plan?

This article gives a basic overview of the procedure for astronauts on deep space missions who need to take shelter from energetic events such as solar flares. The shelter area strongly resembles a ...
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107 views

Why might NASA need to "practice moving a spaceship in different orbits in deep space"?

The NASA.gov feature Q&A: NASA’s New Spaceship says Q: NASA’s really building a spaceship?! A: That’s right! NASA is working with its partners to design and develop a small spaceship that will ...
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24 views

Closest distance that two unrelated spacecraft have come while both in heliocentric orbits?

In 2015 STEREO A and B passed each other passing roughly behind the Sun at the same time from opposite directions as seen from Earth. But these two are part of a single mission, put into these orbits ...
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46 views

How will Lucy "make use" of a deep space atomic clock?

The entry for Lucy in Wikipedia's Selection of Discovery Mission 13 and 14; Finalists says: The mission will make use of the Deep Space Atomic Clock.81 81https://www.universetoday.com/122822/...
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35 views

Long delay-doppler measurements on deep space craft; couldn't optical measurements be made intermittently, mixed with contacts to other spacecraft?

In this comment below Will future deep space optical communications “ground stations” actually be in space, or on the ground? in response to a discussion about ground stations being used for tracking ...
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51 views

How much did each MarCO 6U cubesat weigh?

Yes the answer is zero now because they are weightless, but I used past tense. In any event, let's try to find a good, reliable source for each spacecraft's mass and whether that number is dry or ...
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90 views

How will NASA's software for autonomous navigation in cis-lunar space be tested; what information is processed, what outputs evaluated?

note: it's been a year and a half and Capstone is scheduled to be launched soon, so perhaps there is more information available now? NASA news item NASA Funds CubeSat Pathfinder Mission to Unique ...
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83 views

Will ESA's Solar Orbiter crash into Venus? If so, why?

The BBC News article European SolO probe ready to take on audacious mission links to the ESA video shown below and contains this 5 minute audio interview with NASA deputy project scientist on the ...
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69 views

Could outer system probes detect lasers shone at them from earth (orbit)?

Does the Voyager spacecraft have instruments capable of detecting laser light if shone at them? New Horizons certainly does. Any other probes? Is there any laser capable of accuracy and power enough ...