Comet C/2012 S1 ISON is being followed | |
Circulator 38 (OP) User ID: 143678 Canada 01/17/2013 08:31 PM Report Abusive Post Report Copyright Violation | Comet C/2012 S1 ISON Facebook Page - [link to facebook.com] |
Anonymous Coward User ID: 28606251 United States 01/17/2013 08:33 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 17418121 Ireland 01/17/2013 08:34 PM Report Abusive Post Report Copyright Violation | |
GeezinGA User ID: 27780868 United States 01/17/2013 08:35 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 667899 Puerto Rico 01/17/2013 08:42 PM Report Abusive Post Report Copyright Violation | What is the bright dot/pixel that is following behind the movement on the comet? Quoting: Anonymous Coward 143678 [link to www.digitalsky.org.uk] The thought that came to me when I viewed this: You know how NASCAR drivers will tail gate another car in a race to conserve fuel, by getting the car in front of them to break the wind and therefore ride in the wind stream with less resistance and save fuel, less pit stops... Could this be the same phenomena when attempting deep space travel? When traveling great distances at high speeds even in space although there's no wind resistance every little bit helps to reduce a drag effect. Even the Apollo missions used the moon's gravity to sling shot themselves back to Earth. I'm not sure my physics is sound.... |
Anonymous Coward User ID: 4123634 United States 01/17/2013 08:44 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 28959013 Canada 01/17/2013 08:49 PM Report Abusive Post Report Copyright Violation | What is the bright dot/pixel that is following behind the movement on the comet? Quoting: Anonymous Coward 143678 [link to www.digitalsky.org.uk] The thought that came to me when I viewed this: You know how NASCAR drivers will tail gate another car in a race to conserve fuel, by getting the car in front of them to break the wind and therefore ride in the wind stream with less resistance and save fuel, less pit stops... Could this be the same phenomena when attempting deep space travel? When traveling great distances at high speeds even in space although there's no wind resistance every little bit helps to reduce a drag effect. Even the Apollo missions used the moon's gravity to sling shot themselves back to Earth. I'm not sure my physics is sound.... My thoughts say a tag along should orbit the object rotating axialy about It's direction of travel..... $0.02 |
Circulator 38 (OP) User ID: 143678 Canada 01/17/2013 09:26 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 32200004 United States 01/17/2013 09:33 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 29091186 United States 01/17/2013 09:40 PM Report Abusive Post Report Copyright Violation | |
Dr. Astro Senior Forum Moderator User ID: 31516487 United States 01/18/2013 12:16 AM Report Abusive Post Report Copyright Violation | Completely different image taken a month prior. The original OP image shows mostly hot pixels "chasing" the comet. The hot pixels show the tracking drift of the telescope over time. Hot pixels are distinct from real point-like light sources in the image such as stars and asteroids by the fact that they do not form point spread functions, they're just sharp dots. There are hot pixels in the italian time lapse you posted there as well, but they move vertically in the image in that example. There is an asteroid in the OP image besides the comet, but they're not physically close; the asteroid (2002 TY164) was about 1.3 AUs from earth vs about 4.1 AUs for the comet. They both move in prograde orbits around the sun so for short time intervals such as the 2 hours in which the timelapse was taken, you can't readily tell the different in their motion just by eye. Here's a crop of the OP image centered on the asteroid: [link to i319.photobucket.com] Notice how it forms a point-spread function like the stars around it. Based on astrometry I performed on the image (here's a version of the astrometrically solved image you can open in google sky: [link to nova.astrometry.net] ) I confirmed that it is 2002 TY164, which was the closest asteroid to the comet in the sky that night. |
Dr. Astro Senior Forum Moderator User ID: 31516487 United States 01/18/2013 12:17 AM Report Abusive Post Report Copyright Violation | Actually that indicates it's a hot pixel, but what you're getting at is that it does not form a point-spread function and indeed that is how you can easily distinguish between noise in the camera (hot pixels and cosmic ray hits) and real point-like light sources such as stars and asteroids. |
Anonymous Coward User ID: 2356756 United States 01/18/2013 03:32 AM Report Abusive Post Report Copyright Violation | |
CleverMoniker User ID: 19931300 Canada 01/18/2013 05:45 AM Report Abusive Post Report Copyright Violation | Actually that indicates it's a hot pixel, but what you're getting at is that it does not form a point-spread function and indeed that is how you can easily distinguish between noise in the camera (hot pixels and cosmic ray hits) and real point-like light sources such as stars and asteroids. I think you're a shill for Big Pixel. ;) |
Anonymous Coward User ID: 29014015 United States 01/18/2013 11:10 AM Report Abusive Post Report Copyright Violation | why do the hot pixles dim same time as Ison dims ? [link to www.youtube.com] you can see it if you zoom in.I was thinkink lense flare myself ? |
Anonymous Coward User ID: 29014015 United States 01/18/2013 11:19 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 32360712 United Kingdom 01/18/2013 11:20 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 29014015 United States 01/18/2013 11:31 AM Report Abusive Post Report Copyright Violation | |
Dr. Astro Senior Forum Moderator User ID: 9040374 United States 01/18/2013 12:10 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 29014015 United States 01/18/2013 12:12 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 25801142 United States 01/18/2013 12:16 PM Report Abusive Post Report Copyright Violation | |