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#11
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Photos from Pluto
Big John wrote:
A country boy with an interest in space is wondering how long will it take photos to get back to Earth from "New Horizons", once it arrives in the Pluto neighborhood? I've read a lot of stuff about the flight, but haven't seen that. This is from the New Horizons press kit: because New Horizons will be more than 3 billion miles from Earth and radio signals will take more than four hours to reach the spacecraft, it can send information at about 700 bits per second. It will take nine months to send the full set of Pluto encounter science data back to Earth. http://pluto.jhuapl.edu/images/mainP...essKit1_06.pdf Does that answer your question? |
#12
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Photos from Pluto
More info from the same reference:
The situation becomes much more challenging at Pluto, where the downlink rate will range between 600 to 1,200 bits per second. At that rate mission operators would need several hours to downlink even a single image from New Horizons' long-range camera . . . |
#13
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Photos from Pluto
Pluto's orbit is fairly eccentric, but if you take the average 5.8x10^9
km, and the speed of light is 3x10^5 km/sec, then, it would take around 19000 seconds to get here (rounding to significant digits) or roughly 5 hours. |
#14
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Photos from Pluto
Ah! Ha!! Just what I was looking for!! The press kit!!!
Thanks so much! Answered all to my questions! - Approx. 4 hrs 25min, - page34. I guess I could have averaged all the times reported and gotten pretty close. Hmmmm! Let's see, 44 hours,12 hours,6 hours, 5hrs 20 min-- naw, that will still be way off!! At least a couple were close enough for government work, i.e.about 4 and a half hours. Interesting how some folks feel they just have to give an answer to any question, even if they have no idea!! - and then show all the calculations as to how they arrived at the wrong answer. Glad it wasn't important!! Seems that whomever put this kit out also thinks New Horizons is going to take some pictures (a rose by any other name --- images, pictures, photos -- see page 34 and 35) Thanks for all the responses - it's been fun. I hope I'm still around to see the "pictures". BJ fgoodwin wrote: Big John wrote: A country boy with an interest in space is wondering how long will it take photos to get back to Earth from "New Horizons", once it arrives in the Pluto neighborhood? I've read a lot of stuff about the flight, but haven't seen that. This is from the New Horizons press kit: because New Horizons will be more than 3 billion miles from Earth and radio signals will take more than four hours to reach the spacecraft, it can send information at about 700 bits per second. It will take nine months to send the full set of Pluto encounter science data back to Earth. http://pluto.jhuapl.edu/images/mainP...essKit1_06.pdf Does that answer your question? |
#15
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Photos from Pluto
Believe the press kit! My answer was back-of-the-envelope after a long night
working so apologies for dropping a decimal point. :-) Cheers. Ken "Big John" wrote in message m... Ah! Ha!! Just what I was looking for!! The press kit!!! Thanks so much! Answered all to my questions! - Approx. 4 hrs 25min, - page34. I guess I could have averaged all the times reported and gotten pretty close. Hmmmm! Let's see, 44 hours,12 hours,6 hours, 5hrs 20 min-- naw, that will still be way off!! At least a couple were close enough for government work, i.e.about 4 and a half hours. Interesting how some folks feel they just have to give an answer to any question, even if they have no idea!! - and then show all the calculations as to how they arrived at the wrong answer. Glad it wasn't important!! Seems that whomever put this kit out also thinks New Horizons is going to take some pictures (a rose by any other name --- images, pictures, photos -- see page 34 and 35) Thanks for all the responses - it's been fun. I hope I'm still around to see the "pictures". BJ fgoodwin wrote: Big John wrote: A country boy with an interest in space is wondering how long will it take photos to get back to Earth from "New Horizons", once it arrives in the Pluto neighborhood? I've read a lot of stuff about the flight, but haven't seen that. This is from the New Horizons press kit: because New Horizons will be more than 3 billion miles from Earth and radio signals will take more than four hours to reach the spacecraft, it can send information at about 700 bits per second. It will take nine months to send the full set of Pluto encounter science data back to Earth. http://pluto.jhuapl.edu/images/mainP...essKit1_06.pdf Does that answer your question? |
#16
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Photos from Pluto
Big John wrote:
I guess I could have averaged all the times reported and gotten pretty close. Hmmmm! Let's see, 44 hours,12 hours,6 hours, 5hrs 20 min-- naw, that will still be way off!! At least a couple were close enough for government work, i.e.about 4 and a half hours. Interesting how some folks feel they just have to give an answer to any question, even if they have no idea!! - and then show all the calculations as to how they arrived at the wrong answer. Glad it wasn't important!! I'm sure all the respondents were trying to be helpful; I think the 44 hours was off by a decimal point. |
#17
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Photos from Pluto
"fgoodwin" wrote in message
oups.com... Big John wrote: I guess I could have averaged all the times reported and gotten pretty close. Hmmmm! Let's see, 44 hours,12 hours,6 hours, 5hrs 20 min-- naw, that will still be way off!! At least a couple were close enough for government work, i.e.about 4 and a half hours. Interesting how some folks feel they just have to give an answer to any question, even if they have no idea!! - and then show all the calculations as to how they arrived at the wrong answer. Glad it wasn't important!! I'm sure all the respondents were trying to be helpful; I think the 44 hours was off by a decimal point. Yep, comes from doing it in my head just before a meal - brain was already out to lunch! :-) Ken |
#18
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Photos from Pluto
"fgoodwin" wrote in message ups.com... More info from the same reference: The situation becomes much more challenging at Pluto, where the downlink rate will range between 600 to 1,200 bits per second. At that rate mission operators would need several hours to downlink even a single image from New Horizons' long-range camera . . . Bah, I worked with modems slower than that. Ah, the good old days. :-) |
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