New Verizons.stessier wrote:With New Horizons destined to meet Pluto on July 14, I've been doing some background reading and finally found someone who would be envious of Smoove's internet connection!
Communication with the spacecraft is via X band. The craft had a communication rate of 38 kbit/s at Jupiter; at Pluto's distance, a rate of approximately 1 kbit/s is expected. Besides the low bandwidth, Pluto's distance also causes a (one-way) latency of about 4.5 hours.
SPACE - random thread about space stuff
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Re: SPACE - random thread about space stuff
Much prefer my Nazis Nuremberged.
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Re: SPACE - random thread about space stuff
It causes 4.5 hour latency going one way. It also causes 4.5 hour latency going the other way.Unagi wrote:How does the distance only cause a one-way latency? That makes about zero sense to me.
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Re: SPACE - random thread about space stuff
It's just 4.5 hours one way - 9 hours round trip. They quote it one way because it's not like you are doing a live chat with that type of latency. They will mostly just be listening as it beams back the data it gets.Unagi wrote:How does the distance only cause a one-way latency? That makes about zero sense to me.
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Re: SPACE - random thread about space stuff
Oh, OK - I get it.
Thanks.
For some reason, to my ear, it sounded like they were trying to say that there wasn't any latency in the other direction, or that the latency would be different.
Thanks.
For some reason, to my ear, it sounded like they were trying to say that there wasn't any latency in the other direction, or that the latency would be different.
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Re: SPACE - random thread about space stuff
If you can figure out how to do that, you can make a lot of money.
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Re: SPACE - random thread about space stuff
If I remove the (), I think it's how they say "The distance causes a one-way latency..." that I focused on...
Better:
Pluto's distance also causes a latency of about 4.5 hours (one-way).
or
Pluto's distance also causes a latency of about 4.5 hours (9 hours, round-trip).
Better:
Pluto's distance also causes a latency of about 4.5 hours (one-way).
or
Pluto's distance also causes a latency of about 4.5 hours (9 hours, round-trip).
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Re: SPACE - random thread about space stuff
A great explanation from Emily Lakdawalla of what that tiny bandwidth means:
On Sunday, July 12, New Horizons will transmit the last of its optical navigation data. These images will have lower resolution than the images we have already received from Dawn at Ceres. Then, on Sunday and Monday, July 12 and 13, there will be a series of four "Fail Safe" downlinks. These are designed to return a minimum set of data from all instruments, just in case New Horizons does not survive the flyby. A last downlink ending overnight Monday July 13, called "E-Health 1," will include one last pre-closest approach photo of Pluto.
Then there is a nail-biting 24-hour period of waiting while New Horizons concentrates on flyby science and does not communicate with Earth, followed by the much-anticipated beep of the "Phone Home" downlink on Tuesday night, July 14. Following closest approach, on Wednesday and Thursday, July 15 and 16, there will be a series of "First Look" downlinks containing a sampling of key science data. Another batch of data will arrive in the "Early High Priority" downlinks over the subsequent weekend, July 17-20. Then there will be a hiatus of 8 weeks before New Horizons turns to systematically downlinking all its data. Almost all image data returned during the week around closest approach will be lossily compressed -- they will show JPEG compression artifacts. Only the optical navigation images are losslessly compressed.
The transmission of the High Priority data set will be complete on July 20, and then image transmission will pause. For nearly two months, until September 14, New Horizons will switch to near-real-time downlinking of data from instruments that generate low data volumes (like SWAP and PEPSSI) while it transmits just housekeeping information for all of the rest of the data. No new images will arrive on the ground during this time.
On September 14, New Horizons will begin downlinking a "browse" version of the entire Pluto data set, in which all images will be lossily compressed. It will take about 10 weeks to get that data set to the ground. There will be compression artifacts, but we'll see the entire data set. Then, around November 16, New Horizons will begin to downlink the entire science data set losslessly compressed. It will take a year to complete that process.
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Re: SPACE - random thread about space stuff
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Re: SPACE - random thread about space stuff
Don't worry, you're not crazy. : ) Their sentence was poorly worded.Unagi wrote:Oh, OK - I get it.
Thanks.
For some reason, to my ear, it sounded like they were trying to say that there wasn't any latency in the other direction, or that the latency would be different.
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Re: SPACE - random thread about space stuff
Done !stessier wrote:It's from Wikipedia - you can make the change!
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Re: SPACE - random thread about space stuff
Well actually... If there's a lot of pairity bits and redundancies in the signal from the probe, then that transmission may carry much less signal per unit time compared to the outgoing transmissions from Earth. Why? Because the probe is very limited in its battery capacity (and therefore transmission power) while terrestrial sources are not nearly so limited.stessier wrote:If you can figure out how to do that, you can make a lot of money.
Five-million dollars, please.
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Re: SPACE - random thread about space stuff
First I have no idea what I am talking about. Pretty much a given on the internet, but just wanted it out there.The Meal wrote:Well actually... If there's a lot of pairity bits and redundancies in the signal from the probe, then that transmission may carry much less signal per unit time compared to the outgoing transmissions from Earth. Why? Because the probe is very limited in its battery capacity (and therefore transmission power) while terrestrial sources are not nearly so limited.stessier wrote:If you can figure out how to do that, you can make a lot of money.
Five-million dollars, please.
How does that decrease latency? Isn't it the time from Point A to Point B? It's going at the speed of light (or there abouts) isn't it?
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Re: SPACE - random thread about space stuff
I'm talking out of my ass as well.
I think you're correct regarding latency. My statement would apply to transmission speeds.
Here's your five million bucks back.
I think you're correct regarding latency. My statement would apply to transmission speeds.
Here's your five million bucks back.
"Better to talk to people than communicate via tweet." — Elontra
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Re: SPACE - random thread about space stuff
You're not thinking fourth dimensionally!
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Re: SPACE - random thread about space stuff
Well, FWIW, you can link the signal coding to latency since the processing time to decode the signal will increase the latency to some (probably negligible) degree. But not to the tune of a 5 megabuck prize...The Meal wrote:I'm talking out of my ass as well.
I think you're correct regarding latency. My statement would apply to transmission speeds.
Here's your five million bucks back.
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Re: SPACE - random thread about space stuff
Nice! 5¢ please.
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Re: SPACE - random thread about space stuff
Ker-boom! goes the latest ISS resupply launch, this time by SpaceX. Third consecutive failure, but the first for the Falcon booster. No word yet on whether the astronauts are drawing straws. NASA usually issues a "no problem" statement after one of these missions fails...but after three in a row I imagine that some commodities must be getting a little tight.
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Re: SPACE - random thread about space stuff
The APOD for today is showing what appears to be a mountain on Ceres - possibly one of the bright spots previously viewed through as Dawn has been moving closer over the last few months...
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Re: SPACE - random thread about space stuff
I saw a news piece this morning suggesting that, if the space station cannot be supplied sometime this summer, NASA would have to consider evacuating it. Which struck me as rather odd:Kraken wrote:Ker-boom! goes the latest ISS resupply launch, this time by SpaceX. Third consecutive failure, but the first for the Falcon booster. No word yet on whether the astronauts are drawing straws. NASA usually issues a "no problem" statement after one of these missions fails...but after three in a row I imagine that some commodities must be getting a little tight.
(1) Presumably NASA would need to send a shuttle up to bring the astronauts down, right? Wouldn't that shuttle just bring supplies? Or do the astronauts have a way to get down on their own?
(2) Isn't it kind of weird that we are dependent on a company to resupply an international space station? Though I guess it's better to have more options, I suppose.
Black Lives Matter.
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Re: SPACE - random thread about space stuff
The failure have been a team effort.
And they have the means to return already there.The failure is the third unsuccessful cargo mission over the past eight months. A Russian cargo ship did not complete its mission in April, and an Orbital Sciences Corp. capsule was destroyed in a launch accident in October.
2012 wrote:The crew of the International Space Station (ISS) briefly took refuge in escape capsules as a piece of space junk hurtled by.
...
They were ordered by ground control to move into two Soyuz escape capsules in case the station was hit, but a Nasa spokesman said they were given the green light to return to the main station at 0238 GMT on Saturday.
It's almost as if people are the problem.
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Re: SPACE - random thread about space stuff
This is a bit old (and possibly posted in one of the random threads), but
Samantha Cristoforetti - Keeping Space Fun:
Samantha Cristoforetti - Keeping Space Fun:
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MYT
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MYT
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Re: SPACE - random thread about space stuff
The last I heard, the supplies on hand are sufficient to keep the 3-man crew going until October 2015. There are something like 4 resupply missions scheduled before then, although one of them was a Falcon 9 mission and would presumably be scrubbed if they don't sort out the most recent launch failure.El Guapo wrote:I saw a news piece this morning suggesting that, if the space station cannot be supplied sometime this summer, NASA would have to consider evacuating it. Which struck me as rather odd:Kraken wrote:Ker-boom! goes the latest ISS resupply launch, this time by SpaceX. Third consecutive failure, but the first for the Falcon booster. No word yet on whether the astronauts are drawing straws. NASA usually issues a "no problem" statement after one of these missions fails...but after three in a row I imagine that some commodities must be getting a little tight.
(1) Presumably NASA would need to send a shuttle up to bring the astronauts down, right? Wouldn't that shuttle just bring supplies? Or do the astronauts have a way to get down on their own?
(2) Isn't it kind of weird that we are dependent on a company to resupply an international space station? Though I guess it's better to have more options, I suppose.
NASA doesn't have any way to launch/retrieve crew using their own equipment. So far as I know, they are completely reliant on the Russians for manned vehicles at the moment.
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Re: SPACE - random thread about space stuff
I think I'm in love (again)...LawBeefaroni wrote:This is a bit old (and possibly posted in one of the random threads), but
Samantha Cristoforetti - Keeping Space Fun:
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Re: SPACE - random thread about space stuff
The Falcon has 18 successful launches behind it, so this failure shouldn't be a huge setback for further cargo missions. Bigger question is whether it will affect their crewed launch timetable. SpaceX said that astronauts would have survived that explosion, btw.Max Peck wrote:The last I heard, the supplies on hand are sufficient to keep the 3-man crew going until October 2015. There are something like 4 resupply missions scheduled before then, although one of them was a Falcon 9 mission and would presumably be scrubbed if they don't sort out the most recent launch failure.El Guapo wrote:I saw a news piece this morning suggesting that, if the space station cannot be supplied sometime this summer, NASA would have to consider evacuating it. Which struck me as rather odd:Kraken wrote:Ker-boom! goes the latest ISS resupply launch, this time by SpaceX. Third consecutive failure, but the first for the Falcon booster. No word yet on whether the astronauts are drawing straws. NASA usually issues a "no problem" statement after one of these missions fails...but after three in a row I imagine that some commodities must be getting a little tight.
(1) Presumably NASA would need to send a shuttle up to bring the astronauts down, right? Wouldn't that shuttle just bring supplies? Or do the astronauts have a way to get down on their own?
(2) Isn't it kind of weird that we are dependent on a company to resupply an international space station? Though I guess it's better to have more options, I suppose.
NASA doesn't have any way to launch/retrieve crew using their own equipment. So far as I know, they are completely reliant on the Russians for manned vehicles at the moment.
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Re: SPACE - random thread about space stuff
As I understand it there won't be any Falcon 9 launches until the cause of the failure is identified, which will hopefully not take too long.Kraken wrote:The Falcon has 18 successful launches behind it, so this failure shouldn't be a huge setback for further cargo missions. Bigger question is whether it will affect their crewed launch timetable. SpaceX said that astronauts would have survived that explosion, btw.
Gwynne Shotwell, president, SpaceX wrote:Once we identify the issues we will submit that documentation to the FAA and it will be considered prior to the next flight. I don't have a timeline for that right now. It certainly isn't going to be a year - (more likely) a month or so.
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Re: SPACE - random thread about space stuff
Not good: NASA lost contact with New Horizons on July 4. When communications were restored the probe was in safe mode. They've got about a week to fix it before closest approach. It's turning into a nail-biter.
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Re: SPACE - random thread about space stuff
I require a reminder as to why raining arcane destruction is not an appropriate response to all of life's indignities. - Vaarsuvius
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Re: SPACE - random thread about space stuff
In other good news, looks like the ISS was resupplied as well.
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Re: SPACE - random thread about space stuff
All is wellKraken wrote:Not good: NASA lost contact with New Horizons on July 4. When communications were restored the probe was in safe mode. They've got about a week to fix it before closest approach. It's turning into a nail-biter.
"The investigation into the anomaly that caused New Horizons to enter 'safe mode' on July 4 has concluded that no hardware or software fault occurred on the spacecraft," mission team members wrote in an update Sunday (July 5). "The underlying cause of the incident was a hard-to-detect timing flaw in the spacecraft command sequence that occurred during an operation to prepare for the close flyby. No similar operations are planned for the remainder of the Pluto encounter."
The only reason people get lost in thought is because it's unfamiliar territory.
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Re: SPACE - random thread about space stuff
I'm relieved that no lengthy trouble-shooting was required. With an 8.8-hour two-way communications delay, it would've unfolded in slow motion.
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Re: SPACE - random thread about space stuff
Lassr wrote:All is wellKraken wrote:Not good: NASA lost contact with New Horizons on July 4. When communications were restored the probe was in safe mode. They've got about a week to fix it before closest approach. It's turning into a nail-biter.
"The investigation into the anomaly that caused New Horizons to enter 'safe mode' on July 4 has concluded that no hardware or software fault occurred on the spacecraft," mission team members wrote in an update Sunday (July 5). "The underlying cause of the incident was a hard-to-detect timing flaw in the spacecraft command sequence that occurred during an operation to prepare for the close flyby. No similar operations are planned for the remainder of the Pluto encounter."
I guess I made my post from Pluto...that would explain your 16 hour delay in seeing it.
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Re: SPACE - random thread about space stuff
Fantastic. I would love to see an external shot as well, to see what it looks like from about 100' away.Kraken wrote:"Stunning" NASA video of Soyuz docking at the ISS. A half hour of nothing happening very slowly won't be for everyone, but it does convey a strong you-are-there feeling from the Soyuz POV. I'd change "stunning" to "mesmerizing" and beautiful.
Nothing visual happens after target acquisition so spare yourself the last 8 minutes.
Also, first thing that hit my brain when I saw the imagery was flashbacks to the movie 'Gravity'.
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Re: SPACE - random thread about space stuff
Three billion miles from Earth and just two and a half million miles from Pluto, NASA’s New Horizons spacecraft has taken its best image of four dark spots that continue to captivate.
The spots appear on the side of Pluto that always faces its largest moon, Charon—the face that will be invisible to New Horizons when the spacecraft makes its close flyby the morning of July 14. New Horizons principal investigator Alan Stern of the Southwest Research Institute, Boulder, Colorado, describes this image as “the last, best look that anyone will have of Pluto’s far side for decades to come.”
The spots are connected to a dark belt that circles Pluto’s equatorial region. What continues to pique the interest of scientists is their similar size and even spacing. “It’s weird that they’re spaced so regularly,” says New Horizons program scientist Curt Niebur at NASA Headquarters in Washington. Jeff Moore of NASA’s Ames Research Center, Mountain View, California, is equally intrigued. “We can’t tell whether they’re plateaus or plains, or whether they’re brightness variations on a completely smooth surface.”
The large dark areas are now estimated to be 300 miles (480 kilometers) across, an area roughly the size of the state of Missouri. In comparison with earlier images, we now see that the dark areas are more complex than they initially appeared, while the boundaries between the dark and bright terrains are irregular and sharply defined.
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Re: SPACE - random thread about space stuff
It's almost as if people are the problem.
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Re: SPACE - random thread about space stuff
Indeed.
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Re: SPACE - random thread about space stuff
This picture is how Charon was discovered in 1978.
In 1994, this is the picture that Hubble took after corrective surgery:
In 1994, this is the picture that Hubble took after corrective surgery:
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- Smoove_B
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Re: SPACE - random thread about space stuff
Yeah, that picture they posted this morning is insanely awesome. Mind-boggling, almost.
Maybe next year, maybe no go
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Re: SPACE - random thread about space stuff
Yeah it's beautiful. I expected it to be a big snowball before we started seeing good pictures from this mission.