My Assistant
Site Message
Unmanned Spaceflight.com > All posts by a member| Posted on: Mar 29 2021, 05:14 PM | |
 Newbie  Group: Members Posts: 7 Joined: 19-January 07 From: La Plata, Argentina Member No.: 1630 
|
Hi. Longtime lurker here....working in the field of cosmic rays It seems to me that the image shows a combination of stellar objects on the background, producing the left to right streaks due to the long exposure, with stratight traces from cosmic rays on the ccd, plus particles moving in the near field during said exposure time. Why do they move like that? local electromagnetic fields from the spacecraft? radiation pressure?...no idea!. But electrostatic forces alone would produce more straight lines wouldnt they? |
| Forum: Sun · Post Preview: #251265 · Replies: 149 · Views: 508841 |
| Posted on: Jan 31 2018, 02:05 PM | |
|
Newbie Group: Members Posts: 7 Joined: 19-January 07 From: La Plata, Argentina Member No.: 1630
|
Launched on March 25, 2000, IMAGE, short for Imager for Magnetopause-to-Aurora Global Exploration, was designed to image Earth's magnetosphere and produce the first comprehensive global images of the plasma populations in this region. After successfully completing and extending its initial two-year mission in 2002, contact was unexpectedly lost on December 18, 2005. After an amateur astronomer recorded observations of a satellite in high Earth orbit on January 20, 2018, his initial research suggested it was the IMAGE satellite. you can find more in his blog https://skyriddles.wordpress.com/2018/01/21...llite-is-alive/ pretty cool! |
| Forum: Earth Observations · Post Preview: #238474 · Replies: 5 · Views: 19709 |
| Posted on: Apr 17 2007, 04:26 PM | |
|
Newbie Group: Members Posts: 7 Joined: 19-January 07 From: La Plata, Argentina Member No.: 1630
|
Here You can follow the news and watch a video of ASTRO placing a battery on its client satellite. http://www.darpa.mil/orbitalexpress/mission_updates.html nice, isnt it? |
| Forum: Private Missions · Post Preview: #88461 · Replies: 2 · Views: 7702 |
| Posted on: Apr 16 2007, 09:42 PM | |
|
Newbie Group: Members Posts: 7 Joined: 19-January 07 From: La Plata, Argentina Member No.: 1630
|
Hi! My Fist New topic! I didn't know if the category is right. I finally chosen private missions thinking in its potencial for private use Mr Moderator, if you think this goes anywhere else feel free to move it (I know you don't need my authorization, I'm just being polite) It was strange to me not to hear anything about this in UMSF. ( Maybe I missed it?). As one of the articles say, taking this approach can change drastically how missions can be designed. Sending a lot of fuel in one big tank, for instance, is far more weight efficient (cheaper) than sending along with your ship. And if you are going to stay in earth orbit, you can design your craft with smaller tanks and relly on resuplys http://www.spaceflightnow.com/news/n0704/03orbitalexpress/ http://feedmoo.com/2007/04/09/astro-satell...cts-to-nextsat/ Greetings El Mitico, La Plata, Argentina |
| Forum: Private Missions · Post Preview: #88416 · Replies: 2 · Views: 7702 |
| Posted on: Jan 21 2007, 08:22 PM | |
|
Newbie Group: Members Posts: 7 Joined: 19-January 07 From: La Plata, Argentina Member No.: 1630
|
QUOTE (Mongo @ Jan 21 2007, 01:12 PM)  The total to date would be 96 points (I had not heard that it had a prominant anti-tail, so I have not given points for that. Was there a report of one visible?) Bill Thanks bill!. About the anti-tail, it was my mystake. I had a missconception of what an anti tail was. No anti tail is seen in this comet so long. |
| Forum: Cometary and Asteroid Missions · Post Preview: #81214 · Replies: 200 · Views: 201293 |
| Posted on: Jan 21 2007, 01:48 PM | |
|
Newbie Group: Members Posts: 7 Joined: 19-January 07 From: La Plata, Argentina Member No.: 1630
|
QUOTE (Mongo @ Jan 7 2007, 12:40 AM) Here is a list I made for my own amusement some time ago, of the greatest naked-eye comets of the last two centuries, visible to observers in the northern temperate regions. I used a points system as follows: MAGNITUDE: 10 points for every degree of magnitude brighter than +3 (dark-sky; daytime magnitude gets counted separately) TAIL: 1 point for every two degrees of length of naked-eye visible tail in dark sky DURATION VISIBLE: 1 point for every month naked-eye visible in dark sky BONUS POINTS: 2 visible tails = 10 points 5 visible tails (West 1976) = 20 points 15 degree long anti-tail (Arend-Roland 1957) = 10 points curved tail (Donati 1858) = 5 points 'bright' tail (Daylight 1910) = 10 points 'brilliant' tail (Ikeya-Seki 1965, Great September 1882) = 20 points circumpolar all night (Hyakutake 1996, Tebbutt 1861) = 10 points Mag. -3 in daylight (West 1976) or Mag. -5 in daylight (Daylight 1910) = 10 points Mag. -8 in daylight (Great March 1843) = 15 points Mag. -15 in daylight (Ikeya-Seki 1965) or Mag. -17 in daylight (Great September 1882) = 30 points 1861 123 pts Tebbutt 1882 101 pts Great September Comet 1910 95 pts P/Halley 1976 90 pts West 1996 78 pts Hyakutake 1997 73 pts Hale-Bopp 1858 68 pts Donati 1965 64 pts Ikeya-Seki 1970 61 pts Bennett 1957 57 pts Arend-Roland 1910 54 pts Daylight Comet 1811 52 pts Great Comet 1843 50 pts Great March Comet 1874 46 pts Coggia 1881 42 pts Great Comet 1807 37 pts Great Comet 1853 37 pts Klinkerfues 1835 35 pts P/Halley 1957 35 pts Mrkos 1860 31 pts Great Comet 1911 29 pts Beljawsky 1911 28 pts Brooks 1819 25 pts Tralles 1854 24 pts Great Comet Here is the same list in reverse chronological order: 1997 73 pts Hale-Bopp 1996 78 pts Hyakutake 1976 90 pts West 1970 61 pts Bennett 1965 64 pts Ikeya-Seki 1957 57 pts Arend-Roland 1957 35 pts Mrkos 1911 29 pts Beljawsky 1911 28 pts Brooks 1910 95 pts P/Halley 1910 54 pts Daylight Comet 1882 101 pts Great September Comet 1881 42 pts Great Comet 1874 46 pts Coggia 1861 123 pts Tebbutt 1860 31 pts Great Comet 1858 68 pts Donati 1854 24 pts Great Comet 1853 37 pts Klinkerfues 1843 50 pts Great March Comet 1835 35 pts P/Halley 1819 25 pts Tralles 1811 52 pts Great Comet 1807 37 pts Great Comet Bill According to bill's scale, I rate Mc Naught Magnitude -5 : 80 points (not sure if this is correct, maybe I should rate -2 for dark skies or less?) Tail: 10 points Duration: 1 point BONUS POINTS: 15 degree long anti-tail (Arend-Roland 1957) = 10 points curved tail (Donati 1858) = 5 points 'bright' tail (Daylight 1910) = 10 points Mag. -3 in daylight (West 1976) or Mag. -5 in daylight (Daylight 1910) = 10 points Total: 126 (or 96?)! Bill...please rate it! |
| Forum: Cometary and Asteroid Missions · Post Preview: #81193 · Replies: 200 · Views: 201293 |
| Posted on: Jan 20 2007, 10:27 PM | |
|
Newbie Group: Members Posts: 7 Joined: 19-January 07 From: La Plata, Argentina Member No.: 1630
|
Hi there!. I'm a new proud memmber of UMSF (lurking for about 3 years!). I'm from argentina and maybe today wheather will be nice to see the comet (again, luky me!  ).I have one question I couldn't google and would like to know. Why the comet tail is not continuous? why it looks like aurora borealis? is it an atmospheric effect? can anyone give me some insights on this. I understand why it is curved, but I expected it to be more homogeneous. Thanks! |
| Forum: Cometary and Asteroid Missions · Post Preview: #81157 · Replies: 50 · Views: 49044 |
 New Replies No New Replies Hot Topic (New) Hot Topic (No New) |
 Poll (New) Poll (No New) Locked Topic Moved Topic |
|
Lo-Fi Version | Time is now: 17th December 2024 - 02:33 AM |
|
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |
|
