Questions tagged [starlink]

Questions about Starlink, the satellite constellation developed by SpaceX to provide global broadband Internet

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0answers
42 views

What are the electrical requirements of the antennas used in Starlink?

My interest is in both the antenna for the ground segment (the "UFO on a stick") and the antennas for the space segment (phased arrays if I'm not mistaken). I couldn't find around much more ...
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4k views

What impact will the de-orbiting of thousands of satellites have on the atmosphere?

With the creation of mega satellite constellations like starlink, there are several thousand satellites being launched each year. This means that as these satellites go out of order in a few years, ...
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How much krypton is stored on a Starlink satellite?

How much krypton (fuel) is there for the krypton-powered ion thrusters on Starlink satellites and how long does it last?
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Once Starlink is fully deployed how many satellites will be visible at any given moment?

So the GPS system has 31 satellites in an orbit of 20,180 km. Most of the time there are at least 3-4 satellites 'visible' (visible from a signal reception point of view) at any given moment. The ...
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1answer
232 views

Is Starlink VisorSat really dimmer?

Basically a repeat of Is Starlink 1130 (Darksat) really dimmer? but this time with Visorsat. What is the observed brightness of VisorSat(s) and is it dimmer than non-Visorsat Starlink satellites?
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How is 'space junk' monitored pre-launches and when picking satellite orbits?

There is a bunch of junk orbiting right outside the atmosphere of the Earth, an issue that gets addressed more and more as space travel develops. How do they monitor the movement of these to avoid so ...
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90 views

What about Starlink ground terminals for server farms?

There is some information about the small cheap user ground terminals for the Starlink network. But there should be also high bandwidth ground terminals for server farms. For a low latency time these ...
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2answers
3k views

Why does the Falcon 9 launch 60 instead of 100 Starlink satellites at a time?

The Falcon 9 has a capacity of 22,800 kg to LEO. A Starlink satellite has a mass of 227 kg. That means that one Falcon 9 can launch 100 satellites. So why does SpaceX launch 60 instead of 100 ...
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Can the Indian government ask SpaceX to pay for bandwidth usage in its airspace?

Any telecom operator who wants to launch their services in India has to pay billions of USD to the Indian government. My query is if I'm using SpaceX Starlink based data, can the Indian government ...
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1k views

Why is SpaceX deploying Starlink satellites without inter-satellite communication capability?

According to this answer, which cites Wikipedia, the current batch of Starlink satellites that are being deployed don't have the ability to talk to each other. That will come later, according to ...
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707 views

Starlink's autonomous collision avoidance

On their website, SpaceX claims that Starlink satellites are able to conduct autonomous collision avoidance manoeuvres using alerts from the US Department of Defence. This seems very reasonable, given ...
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70 views

How do Starlink trains spread into separate orbits with equidistant orbital slots?

Starlink satellites are launched in batches of 60. They are released from the launch vehicle, and then have to spread out – not only into equidistant slots along a single orbit ring, but now ...
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Have astronauts seen Starlink trains?

Starlink satellites move in the same altitude region as the ISS (on their way up and eventually back down) and are particularly noticeable for weeks after deployment as "trains". Have one of these ...
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How will SpaceX's VisorSat work? How could a sunshade articulate to shade parts of Starlink satellite as it orbits the Earth?

CNET's Elon Musk wants SpaceX to launch the next generation of space telescopes says: The billionaire entrepreneur said that "VisorSat" satellites equipped with a sunshade to block ...
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131 views

How to explain the fast motion of the Starlink satellite in this video?

My friend in Łódź sent me this video today: https://i.imgur.com/EmpNzfs.mp4 This was observed in Widzew district, at 20:42 Warsaw time. He has two questions: given that it looks like it's Starlink ...
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Do Starlink satellites have cameras?

Obviously, Starlink satellites are equipped with sensors for attitude and location detection (like a star tracker or sun tracker) but I'm wondering if they have with any direct Earth observation ...
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373 views

Is Starlink 1130 (Darksat) really dimmer?

I measured a couple of Starlink satellites tonight, finally, Starlink 1130 (Darksat) arrived (March 17th 2020, 20:15 local time). I could not see the sat on the screen although I turned up to gain a ...
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1answer
178 views

What are the orbits of all Starlink satellites launched?

Latest batch of SpaceX Starlink satellites went into elliptical orbit. Using all available data (launch times, release times, applications by SpaceX etc), what are the orbits of all current 300 ...
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162 views

Satellite communications interference due to Starlink by SpaceX

As of 8th February 2020, SpaceX has launched 242 Starlink satellites. To what extent will SpaceX's launch of its Starlink satellites affect satellite communications for other satellites? How much (...
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1answer
2k views

Do the latest Starlink satellites use inter-satellite laser communications?

Do the latest (as of Jan 30, 2020) Starlink satellites use inter-satellite laser communications? I can't find any info about that!
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294 views

Astrophotographer Thierry Legault is not convinced that DarkSat is darker than the others. Have photometric measurements been reported?

In the video below Passage of 7 Starlink satellites including (supposed) "darksat" world renowned astrophotographer Thierry Legault is not impressed by DarkSat's darkness: SpaceX said they ...
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2answers
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Landing legs problem with Falcon 9 Block 5 / Starlink 3 mission

Is this a late landing burn problem? it seems that the engine touch the OCISLY ground as the landing legs flex. Landing occurs at about T+0:08:20
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143 views

Replacement strategies for defective Starlink satellites

I wonder what is the approach to replace let's say: 5 defective Starlink satellites, each one in a different orbit? I guess that it can't be done with just one launch as the krypton ion thrusters ...
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Which of the recently launched Starlink satellites is the coated one?

Does anybody of you experts know which of the recently launched Starlink satellites is the coated one? We are occasionally measuring their brightness and would like to compare uncoated vs. coated. ...
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What attitudes will Starlink satellites have in different orbits?

update 3: Guest Post: Modelling of Starlink trail brightness and comparison to observations update 2: Teslarati's SpaceX’s Starlink “VisorSat” launch plans revealed by Elon Musk explains Open Book ...
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What is the mysterious object flying by in this SpaceX video?

In the last second of this video tweeted by spaceX, you can see an object fly by on screen. Did this come from the SpaceX ship, or is it foreign space junk? If it turns out to be the latter, is that a ...
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1answer
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Has FCC jurisdiction for all the world for SpaceX's Starlink position?

These days, you can read in the news that SpaceX requested FCC for permission to change the orbit of the Starlink satellites already in orbit. Now... from my understanding, the Starlink satellites ...
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How do the Starlink satellites shine?

As we can see the Starlink satellites with the naked eye as they pass by. I was wondering about what makes them visible. Do they have large mirrors that reflect the sunlight making them look as if ...
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1answer
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Space Debris and Megaconstellations: plans for ~1000kms altitude orbits

SpaceX's Starlink and other mega-constellation plans highlight safe de-orbiting features but does this also extend to altitudes higher than 1,000 kms? My concern is whether these smaller sats will ...
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Why is one Starlink satellite not following the adjacent one in this image?

The following image shows trails of SpaceX’s Starlink satellites as seen in the sky above the Cerro Tololo Inter-American Observatory (CTIO) in Chile: Image Source: SpaceX’s Newly Launched Starlink ...
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Would a vantablack coating on the starlink satellites cause overheating problems? [duplicate]

I'm an amateur astronomer and have recently being hearing space x catching alot of flack for the amount of reflection the satellites would cause. While I believe that program is more important than my ...
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197 views

SpaceX's Starlink and astronomy

I was reading articles about Starlink and some concerned astronomers that SpaceX Starlink will lead to more space junk and eventually the death of ground based astronomy. I am just wondering how ...
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What are the bottlenecks stopping SpaceX from launching more frequent batches of Starlink?

If Starlink truly has a large financial potential for SpaceX, how come they are not launching a batch of these satellites every day? What are the bottlenecks?
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Can / should the Starlink satellites be blackened?

So that they are not as visible? I assume the SpaceX engineers have considered this option.
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Possible interference in RF spectrum due to space-based internet

Multiple Commercial Operators plan to use satellite megaconstellations for providing internet coverage in near future. Is there a possibility of interference between RF spectrum already in use for ...
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1answer
179 views

Technical feasibility of a country at least partially preventing use of internet from satellite constellations?

The interesting Politics SE question To what extent can a government control satellite internet compared to internet from a local ISP? asks from the perspective of politics and international law, but ...
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Satellite Megaconstellations RF Spectrum usage for free(?)

As per my understanding, for terrestrial usage RF spectrum is auctioned by the governments before telecom operators can avail it for commercial purpose. Seems like a logical way to utilise limited ...
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Satellite Launch Aprroval: what is the role of ITU, FCC, and other international standards / regulators?

Seeking confirmation for the following assumption: Satellites used for non-communication applications (military surveillance, weather monitoring etc.) are launched without specific prior approval from ...
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848 views

Who built Starlink's electric propulsion systems?

Wondering who actually built the Starlink propulsion systems? Did SpaceX develop this technology in-house, outsource or acquire a company that had the IP and bring this back in-house? Very curious ...
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1answer
231 views

How has the brightness of SpaceX's Starlink constellation changed since May?

Shortly after the launch, before full orientation of the solar panels and raising of the orbits, the Starlink satellites were surprisingly bright and easily seen with the naked eye. Back then, I heard ...
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710 views

Is it feasible to paint SpaceX Starlink satellites black so as not to frequently saturate the CCDs of the Large Synoptic Survey Telescope?

update: From Nature.com News article: SpaceX launch highlights threat to astronomy from ‘megaconstellations’: But an upcoming, cutting-edge telescope could be in bigger trouble. The US Large Synoptic ...
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How is the brightness of satellites measured?

We would like to perform measurements of the brightness of Starlink satellites. Is there any approved technique available ? I see the name Mike McCants connected with magnitude values of ...
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Has SpaceX made any commentary on StarLink posing a threat to astronomy? [duplicate]

As an amateur astronomer I've always wondered how detrimental 1,000 StarLink satellites could be to viewing the stars from an Earth-bound location. Apparently, according to this article, it is a lot ...
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351 views

How quickly can the Starlink spacecraft respond to an impending collision?

update: The word "refused" might be inaccurate: CNET: ESA's near collision with SpaceX Starlink satellite blamed on a 'bug' Ars Technica: SpaceX satellite was on “collision course” until ...
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Is SpaceX propulsively deorbiting a Starlink satellite already?

The plot below shows that most of the SpaceX Starlink satellites have moved from circa 450 km to circa 550 kilometers already, using their argon-based ion engines. A few, along with four unidentified ...
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1answer
152 views

Would SpaceX's Starlink constellation contribute inordinately to space debris?

I mean they already launched a large constellation of 60 satellites and have plans to launch many more; won't all this contribute inordinately to existing space junk, which is actually becoming a real ...
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1answer
559 views

What are these four “debris” objects along with the Starlink satellites?

Celestrak has an updated system of categories for retrieving lists of current TLEs, and there's already one for Starlink, yay! Currently https://www.celestrak.com/NORAD/elements/starlink.txt contains ...
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234 views

What are Starlink's available momentum unloading strategies?

Today's Teslarati article SpaceX wants to offer Starlink internet to consumers after just six launches talks about the new website https://www.starlink.com/ shows several images from it, and tries to ...
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1answer
775 views

Delta-V of Starlink Satellites

The recently launched Starlink satellites are designed to use their HAL Ion thrusters to seek their own independent orbits, evade collisions, and de-orbit at the end of their lives. That's a lot of ...
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181 views

Larger data rate, Oneweb or Starlink? [closed]

Which satellite constellation will provide the larger downlink data rate, in total and per satellite, Oneweb or Starlink? My consideration: starlink will operate in a lower orbit, with more ...