Linked Questions

27
votes
6answers
7k views

Why no recent information about or photos of Ultima Thule?

It's been two weeks since New Horizons flew past Ultima Thule but the most recent news on the Johns Hopkins site is dated the fourth of January The image gallery has had no new pictures since the ...
22
votes
4answers
2k views

How well can Voyager 1 separate Earth signals from Solar noise these days?

This is a follow-up question to Can Voyager 1 receive signals from Earth? this and this answer. UPDATED: see additional information and discussion below. As it continues to move farther from the Sun, ...
11
votes
5answers
889 views

Why doesn't thermal radio emission from a DSN "hot dish" completely swamp the benefits of a cold LNA?

The 70 meter DSN dishes are often used to receive the weakest signals, and so their receiver LNAs have cryogenic front-ends in an assembly that also contains a LHe refrigerator and vacuum system. If I ...
4
votes
2answers
2k views

Would adding satellites between Earth and Mars improve communications latency?

Would adding satellites along the path from Earth to Mars decrease the amount of time it takes to send and receive messages between them?
4
votes
2answers
1k views

How can I calculate if a satellite is currently in sunlight or eclipse using pyEphem or Skyfield (preferred)?

I'd like to add this to some existing python scripts to model cubesat battery life and payload temperature but the math escapes me.
5
votes
2answers
153 views

When scientific and engineering data are sent from space probes, are the signals repeated to minimize transmission error?

I would think that this would be the case. In any one transmission there will be a systematic error due to the fundamentals of the transmitter / receiver. Is there also a transient or stochastic error ...
3
votes
2answers
358 views

Earth-Mars Radio Blackout: Is it possible to define an extended solar radius to solve this as a geometric problem?

Solar atmosphere causes difficulties in communication during opposition (when Mars is almost behind the sun w.r.t. Earth). The question is: is it possible to define an extended radius for the sun, ...
2
votes
2answers
131 views

Parker Solar Probe orbital velocity

Will Parker Solar Probe's orbital velocity of almost 200 km/s pose any exceptional challenges to the telemetry? Will the signal become distorted?
2
votes
1answer
147 views

Is communication from a spacecraft in SEL1 disturbed by the Sun?

A spacecraft at the Sun Earth Lagrange point one (1% of an AU, or one Solar diameter, from Earth towards the Sun) would have the Sun as its background. Is the Sun emitting strongly enough at ...
7
votes
1answer
142 views

Will there be a command moratorium for Mars spacecraft again in 2021?

About every two years, Earth and Mars are on opposite sides of the Sun (a Mars-solar conjunction). Plasma expelled from the Sun can interfere with radio transmissions between Mars spacecraft and the ...
2
votes
1answer
230 views

How (the heck) does SOHO's SWAN camera image the entire 4π sr celestial sphere?

Comet C/2020 F8 (SWAN) discussed in Astronomy SE: How is Comet SWAN C/2020 F8 doing? Will it become easily visible by eye? Why is SWAN dimming? was discovered by humans but using the SWAN camera on ...
4
votes
0answers
259 views

Why is DSCOVR in a Lissajous orbit? Wouldn't a halo orbit completely avoid the Sun exclusion zone?

Halo orbits are a sub-class of Lissajous orbits. See this answer for (much) more on that. DSCOVR's orbit will put it in it's Sun Exclusion Zone in about 2020 where the communications line of sight ...
2
votes
1answer
152 views

What would be the most viable way to have constant communication with a Mars base?

I am currently working on a project involving designing a Mars base, and a major factor is establishing constant communication between Earth and the Mars ground base. I am thinking of utilizing laser ...