IRAS Telescope at risk of colliding with another satellite TONIGHT! 1 in 20 Chance! | |
Anonymous Coward User ID: 77635199 United States 01/28/2020 04:05 PM Report Abusive Post Report Copyright Violation | |
8503 User ID: 73850363 Poland 01/28/2020 05:11 PM Report Abusive Post Report Copyright Violation | E=(m*v*v)/2 85*14700*14700/2= 9183825000 = 9.2 GJ interaction time … 14.7km/s = 14.7 m / ms … something about 0.2 ms Specific gigajoule to ton of TNT Conversion Results Amount : 9.2 gigajoules (GJ) Equals : 2.20 tons of TNT (tn) Fraction : 2 1/5 tons of TNT (tn) Not so sure ... plasma ball or debris, we will see, hopefully nothing. :-) |
Grief
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Astroshill
(OP) Senior Forum Moderator 01/28/2020 10:18 PM Report Abusive Post Report Copyright Violation | E=(m*v*v)/2 85*14700*14700/2= 9183825000 = 9.2 GJ interaction time … 14.7km/s = 14.7 m / ms … something about 0.2 ms Specific gigajoule to ton of TNT Conversion Results Amount : 9.2 gigajoules (GJ) Equals : 2.20 tons of TNT (tn) Fraction : 2 1/5 tons of TNT (tn) Not so sure ... plasma ball or debris, we will see, hopefully nothing. :-) Thanks. 9.2 gigajoules should be enough to produce a visible flash I would think. Assuming we get a collision of course. Last Edited by Astromut on 01/28/2020 10:19 PM |
Astroshill
(OP) Senior Forum Moderator 01/28/2020 10:19 PM Report Abusive Post Report Copyright Violation | So, about an hour and a half before sunrise, on a mostly quiet night, if i happen to look up, the sky might light up for a little bit? Or not. Quoting: Grief No. It wouldn't be anywhere near Italy. It will be directly over Pittsburgh. Last Edited by Astromut on 01/28/2020 10:19 PM |
Anonymous Coward User ID: 77635199 United States 01/29/2020 06:10 AM Report Abusive Post Report Copyright Violation | [link to www.popularmechanics.com (secure)] PM always has good info |
AxX
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Astroshill
(OP) Senior Forum Moderator 01/29/2020 09:43 AM Report Abusive Post Report Copyright Violation | I tested my equipment last night and found the camera I planned to use is failing. It's been my tracking and planetary camera for about 10 years now, and it's finally giving up the ghost. I'm going to try to replace it with a used unit that was having problems with its automatic gain control and just hope that it doesn't give me trouble tonight. If that fails I might be able to borrow another camera off a friend. |
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Astroshill
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Anonymous Coward User ID: 78026433 Mexico 01/29/2020 12:17 PM Report Abusive Post Report Copyright Violation | E=(m*v*v)/2 85*14700*14700/2= 9183825000 = 9.2 GJ interaction time … 14.7km/s = 14.7 m / ms … something about 0.2 ms Specific gigajoule to ton of TNT Conversion Results Amount : 9.2 gigajoules (GJ) Equals : 2.20 tons of TNT (tn) Fraction : 2 1/5 tons of TNT (tn) Not so sure ... plasma ball or debris, we will see, hopefully nothing. :-) The energy released from a perfect collision will be a LOT higher than that. 2.2 tons of TNT would not make an intact ton of material move even 500 mph, the satellites are going more than 30,000 and energy does not scale linear with speed. TNT has no where near the energy yield per ton that hydrogen has, the blast from TNT is only significant because of how fast the energy is released. It might only match a few pounds of gasoline. Put 10 pounds of gasoline in a bulldozer and see how much you can move with it. It will be a lot more than the TNT would do. |
Anonymous Coward User ID: 49430493 Canada 01/29/2020 01:01 PM Report Abusive Post Report Copyright Violation | [link to twitter.com (secure)] Quoting: Astroshill IRAS, a wide field infrared telescope launched in 1983, is at risk of colliding with an even older satellite, the Gravity Gradient Stabilization Experiment 4 which was launched in 1967 ( [link to nssdc.gsfc.nasa.gov (secure)] ). Both satellites are out of commission so neither can maneuver out of the way. Both are sizable satellites traveling at high velocities relative to each other (they're coming at each other head-on), so a collision would produce a huge amount of debris. The risk of collision currently stands at about 1% with a predicted miss distance of just a few meters. The satellites will actually be overhead and illuminated during an early evening pass for me at the moment of the predicted collision. I will try to track and film it if I can, but the weather forecast is not favorable at that time. Even if the collision does not happen, I should see two satellites passing right by each other. If a collision does happen, it would amazing to capture it on video. It's a low risk, but if it happens it will shower debris along the orbit. These are both high inclination satellites, so the debris field would intersect virtually all low orbits at some point. Thread: Comcast down in most of U S |
Anonymous Coward User ID: 77635199 United States 01/29/2020 01:07 PM Report Abusive Post Report Copyright Violation | I tested my equipment last night and found the camera I planned to use is failing. It's been my tracking and planetary camera for about 10 years now, and it's finally giving up the ghost. I'm going to try to replace it with a used unit that was having problems with its automatic gain control and just hope that it doesn't give me trouble tonight. If that fails I might be able to borrow another camera off a friend. |
Anonymous Coward User ID: 77635199 United States 01/29/2020 01:07 PM Report Abusive Post Report Copyright Violation | |
Astroshill
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AxX
User ID: 75450217 United States 01/29/2020 01:34 PM Report Abusive Post Report Copyright Violation | FWIW, I'm excited to see another Astromutt telescope video. Understood the event is around 6:30pm -- Do you think it'll be about 3 hours before you get in and get the video uploaded? Energy flows where focus goes. [25/77/22] Rev 3:9 <-- Wonder who these guys are? “The future’s uncertain and The End is always near!” - Jim Morrison, 1970 |
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Perchance
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Anonymous Coward User ID: 78409948 France 01/29/2020 02:23 PM Report Abusive Post Report Copyright Violation | [link to twitter.com (secure)] Quoting: Astroshill IRAS, a wide field infrared telescope launched in 1983, is at risk of colliding with an even older satellite, the Gravity Gradient Stabilization Experiment 4 which was launched in 1967 ( [link to nssdc.gsfc.nasa.gov (secure)] ). Both satellites are out of commission so neither can maneuver out of the way. Both are sizable satellites traveling at high velocities relative to each other (they're coming at each other head-on), so a collision would produce a huge amount of debris. The risk of collision currently stands at about 1% with a predicted miss distance of just a few meters. The satellites will actually be overhead and illuminated during an early evening pass for me at the moment of the predicted collision. I will try to track and film it if I can, but the weather forecast is not favorable at that time. Even if the collision does not happen, I should see two satellites passing right by each other. If a collision does happen, it would amazing to capture it on video. It's a low risk, but if it happens it will shower debris along the orbit. These are both high inclination satellites, so the debris field would intersect virtually all low orbits at some point. And then? |
Anonymous Coward User ID: 77635199 United States 01/29/2020 02:25 PM Report Abusive Post Report Copyright Violation | FWIW, I'm excited to see another Astromutt telescope video. Understood the event is around 6:30pm -- Do you think it'll be about 3 hours before you get in and get the video uploaded? Two Old Satellites Dangerously Close to Colliding Over Pittsburgh [link to weather.com (secure)] thanks some news yesterday put am |
BBQ BOY™
User ID: 77857043 United States 01/29/2020 02:28 PM Report Abusive Post Report Copyright Violation | Quoting: Astroshill "Never underestimate the pain of a person. In all honesty, everyone is struggling. Just some people are better at hiding it than others." Everyone has to work out their own salvation. Life can only be understood backwards, but it must be lived forwards. |
G3
User ID: 78370951 United States 01/29/2020 02:29 PM Report Abusive Post Report Copyright Violation | FWIW, I'm excited to see another Astromutt telescope video. Understood the event is around 6:30pm -- Do you think it'll be about 3 hours before you get in and get the video uploaded? Two Old Satellites Dangerously Close to Colliding Over Pittsburgh [link to weather.com (secure)] thanks some news yesterday put am So I guess I'm confused, if this is occurring over the Pittsburgh metro area wouldn't it only be visible say within a 500 mile radius of that area? |
Astroshill
(OP) Senior Forum Moderator 01/29/2020 02:30 PM Report Abusive Post Report Copyright Violation | FWIW, I'm excited to see another Astromutt telescope video. Understood the event is around 6:30pm -- Do you think it'll be about 3 hours before you get in and get the video uploaded? Yeah, at least. Assuming anything even happens, of course. Oh and then there's the weather. I'm driving 2 hours to give myself the best chance of clear skies, but it's still a long shot. |
Astroshill
(OP) Senior Forum Moderator 01/29/2020 02:30 PM Report Abusive Post Report Copyright Violation | FWIW, I'm excited to see another Astromutt telescope video. Understood the event is around 6:30pm -- Do you think it'll be about 3 hours before you get in and get the video uploaded? Two Old Satellites Dangerously Close to Colliding Over Pittsburgh [link to weather.com (secure)] thanks some news yesterday put am So I guess I'm confused, if this is occurring over the Pittsburgh metro area wouldn't it only be visible say within a 500 mile radius of that area? No. These satellites are about 900 km above earth. |
Astroshill
(OP) Senior Forum Moderator 01/29/2020 02:31 PM Report Abusive Post Report Copyright Violation | FWIW, I'm excited to see another Astromutt telescope video. Understood the event is around 6:30pm -- Do you think it'll be about 3 hours before you get in and get the video uploaded? Two Old Satellites Dangerously Close to Colliding Over Pittsburgh [link to weather.com (secure)] thanks some news yesterday put am You heard it here first. |
G3
User ID: 78370951 United States 01/29/2020 02:32 PM Report Abusive Post Report Copyright Violation | ... Quoting: AxX FWIW, I'm excited to see another Astromutt telescope video. Understood the event is around 6:30pm -- Do you think it'll be about 3 hours before you get in and get the video uploaded? Two Old Satellites Dangerously Close to Colliding Over Pittsburgh [link to weather.com (secure)] thanks some news yesterday put am So I guess I'm confused, if this is occurring over the Pittsburgh metro area wouldn't it only be visible say within a 500 mile radius of that area? No. These satellites are about 900 km above earth. Ok, thanks Astro |