Linked Questions

19 votes
3 answers
6k views

Did the Mars rovers actually confirm the gravity of Mars?

For years the theoretical calculated gravity of Mars has proliferated science texts and Internet documentation - but did the rover actually do a test to confirm the theoretical gravity is truly equal ...
Chris's user avatar
  • 301
17 votes
2 answers
11k views

How to calculate data rate of Voyager 1?

I've read the following passage in the answer to the Quora question How can Voyager send a signal strong enough for us to receive, in spite of its enormous distance from us? And how can it have the ...
Tommytii's user avatar
  • 173
14 votes
3 answers
1k views

If Curiosity had lights, could it drive or work in the evening?

If the Mars rover Curiosity had been equipped with lights, would it be able to drive or do other work in the evening? This could be some combination of LED headlights, wheel-lights, and/or a spotlight ...
uhoh's user avatar
  • 149k
8 votes
2 answers
587 views

~15.5817 -- Is there a name for this number?

I've been playing with Hohmann transfers from one circular orbit to another. I've been calling the radius of the departure orbit 1 and the radius of the arrival orbit $r$ with $r>1$. There are ...
HopDavid's user avatar
  • 15.8k
9 votes
2 answers
1k views

What is the pop-up circular disk with spiral pattern in this NASA animation of the Dragonfly helicopter for Titan? Antenna? Kind, band, target?

At 00:36 in the June 2019 NASA video Dragonfly: NASA's New Mission to Explore Saturn's Moon Titan the animation shows it landing then deploying a circular disk with ...
uhoh's user avatar
  • 149k
5 votes
4 answers
836 views

Missions at or soon-to-be at Mars and their DSN "codenames"?

I'm "mining" old DSN data and would like to see all communications with spacecraft around Mars. A quick snapshot in their data shows the following codes. I can guess that ...
uhoh's user avatar
  • 149k
9 votes
1 answer
1k views

How does Curiosity know how to point and move it's high gain antenna in real time?

The Curiosity rover has a compact X-band high-gain antenna (HGA) that allows for low data rate communication directly with Earth, but is used though for higher data rates it usually uses UHF to ...
uhoh's user avatar
  • 149k
9 votes
1 answer
662 views

Is there any publicly available logging, or "Wayback Machine" for DSN Now activity?

This question and especially this comment address activity associated with the Juno mission, both circa arrival, and the relatively quiet transit period to Jupiter. The idea is that there may have ...
uhoh's user avatar
  • 149k
4 votes
2 answers
369 views

Do lunar rovers on the near side of the Moon need a relay communication satellite?

Wikipedia says direct communication is not possible from the far side of the moon. So I'm guessing it should be possible for the satellite to communicate directly without relay satellite from the near ...
Chinmay Singh's user avatar
-1 votes
2 answers
431 views

Has anybody ever picked up the signal transmitted by a successful Mars lander or rover sent by the United States? [closed]

It is known that on February 4, 1966, the picture transmitted from the Moon by Luna 9 was intercepted by UK. The question is, has anybody ever picked up a signal transmitted by a successful Mars ...
azot's user avatar
  • 981
2 votes
1 answer
641 views

What connection do Mars rovers use to send data to Earth?

How do Mars rovers send data back to Earth? Do they have some kind of built in WI-FI routers or is there any other connection?
RANSARA009's user avatar
3 votes
1 answer
556 views

Power and frequency units used in Deep Space Network XML data?

NASA's Deep Space Network activity can be viewed conveniently at https://eyes.nasa.gov/dsn/dsn.html but if you would like data in a more raw XML form, it can be accessed as described in this answer ...
uhoh's user avatar
  • 149k
4 votes
2 answers
287 views

What does it take to upgrade a radio antenna to receive from the surface of Mars?

All the discussion about receiving transmissions from Mars rovers got me thinking, what determines the capability of a radio antenna, and what goes into adding the capability of listening to a Mars ...
Schwern's user avatar
  • 8,016
4 votes
2 answers
335 views

Are Mars rovers in continuous contact with Earth when in line of sight?

The NASA Perseverance rover Communications page describes the Ultra-High Frequency Antenna, the X-band High-Gain Antenna, and the X-band Low-Gain Antenna but does not mention how often it will be in ...
Bob516's user avatar
  • 6,999
4 votes
1 answer
177 views

How does a third DSN station serves as a “relay” to tie-together observations by two other stations doing VLBI?

Section 2.1 of the DESCANSO document 211 Wideband Very-Long Baseline Interferometry (from here, found here) says: The precision of a VLBI measurement improves with the length of the baseline. The ...
uhoh's user avatar
  • 149k

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