by neufer » Tue Aug 25, 2015 8:44 pm
Ron-Astro Pharmacist wrote:
I know what the green streaks are... but who's sending them??
![Smile :)](./images/smilies/icon_smile.gif)
And why?
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)
- Parent body Comet Swift–Tuttle could clean our clock:
https://en.wikipedia.org/wiki/Comet_Swift%E2%80%93Tuttle wrote:
<<
Comet Swift–Tuttle is a periodic comet with an orbital period of 133 years. It is the largest Solar System object that makes repeated close approaches to Earth with a relative velocity of 60 km/s. An Earth impact would have an estimated energy of ≈27 times that of the Cretaceous–Paleogene impactor. Comet Swift–Tuttle has been described as "the single most dangerous object known to humanity".
Comet Swift–Tuttle is the parent body of the Perseid meteor shower, perhaps the best known shower and among the most reliable in performance. It was independently discovered by Lewis Swift on July 16, 1862 and by Horace Parnell Tuttle on July 19, 1862.
It has a well determined orbit and has a comet nucleus 26 km in diameter.
In the discovery year of 1862, the comet was as bright as Polaris. The comet made a return appearance in 1992, when it was rediscovered by Japanese astronomer Tsuruhiko Kiuchi and became visible with binoculars. An unusual aspect of its orbit is that it is captured into a 1:11 orbital resonance with Jupiter; it completes one orbit for every 11 of Jupiter.
Upon its 1992 rediscovery, the comet's date of perihelion passage was off from the then-current prediction by 17 days. It was then noticed that, if its next perihelion passage (July 11, 2126) was also off by another 15 days (occurred on July 26), the comet would pass perilously close to Earth or the Moon on August 14, 2126. Given the size of the nucleus of Swift–Tuttle (26 km), this was of some concern. This prompted amateur astronomer and writer Gary W. Kronk to search for previous apparitions of this comet. He found the comet was
most likely observed by the Chinese in 69 BC and AD 188, which was quickly confirmed by Brian G. Marsden. This information and subsequent observations have led to recalculation of its orbit, which indicates the comet's orbit is very stable, and that there is absolutely no threat over the next two thousand years. It is now known that the comet will pass 0.153 AU from Earth on August 5, 2126. It will be a bright naked-eye comet reaching about apparent magnitude 0.7.>>
https://en.wikipedia.org/wiki/Lewis_A._Swift wrote:
<<Lewis A. Swift (February 29, 1820 – January 5, 1913) was an American astronomer. He discovered or co-discovered a number of comets, including periodic comets 11P/Tempel-Swift-LINEAR, 64P/Swift-Gehrels, and 109P/Swift-Tuttle (parent body of the Perseids meteor shower). He was one of the few people to see Comet Halley at two of its appearances, 76 years apart. Apart from comets, he also discovered hundreds of nebulae. One of them is
IC 289.
Swift first became interested in astronomy as young boy after observing the Great Comet of 1843 while on his way to school in Clarkson, New York. His teacher initially dismissed his observation, but three days later the 'discovery' of the comet was announced. Swift conducted his early observations in Rochester, NY, 'lain out in the snow' in an alley on Ambrose Street or on the roof of Duffy's Cider Mill. Later he gained a patron in the Rochester patent medicine businessman Hulbert Harrington Warner, who financed the building of an observatory for Swift. A fund of $13,000 was raised to purchase a 16 inch telescope for Swift. Warner went bankrupt in the Panic of 1893, which ended his financial support, and Swift then went to California to become director of Mount Lowe Observatory, taking the 16 inch telescope with him.>>
[quote="Ron-Astro Pharmacist"]
I know what the green streaks are... but who's sending them?? :) And why? :roll:[/quote]
[list]Parent body Comet Swift–Tuttle could clean our clock:[/list]
[quote=" https://en.wikipedia.org/wiki/Comet_Swift%E2%80%93Tuttle"]
<<[b][color=#0000FF]Comet Swift–Tuttle is a periodic comet with an orbital period of 133 years. It is the largest Solar System object that makes repeated close approaches to Earth with a relative velocity of 60 km/s. An Earth impact would have an estimated energy of ≈27 times that of the Cretaceous–Paleogene impactor. Comet Swift–Tuttle has been described as[/color] "[u][color=#FF0000][i]the single most dangerous object known to humanity[/i][/color][/u]"[/b].
Comet Swift–Tuttle is the parent body of the Perseid meteor shower, perhaps the best known shower and among the most reliable in performance. It was independently discovered by Lewis Swift on July 16, 1862 and by Horace Parnell Tuttle on July 19, 1862. [b][color=#0000FF]It has a well determined orbit and has a comet nucleus 26 km in diameter[/color][/b].
In the discovery year of 1862, the comet was as bright as Polaris. The comet made a return appearance in 1992, when it was rediscovered by Japanese astronomer Tsuruhiko Kiuchi and became visible with binoculars. An unusual aspect of its orbit is that it is captured into a 1:11 orbital resonance with Jupiter; it completes one orbit for every 11 of Jupiter.
Upon its 1992 rediscovery, the comet's date of perihelion passage was off from the then-current prediction by 17 days. It was then noticed that, if its next perihelion passage (July 11, 2126) was also off by another 15 days (occurred on July 26), the comet would pass perilously close to Earth or the Moon on August 14, 2126. Given the size of the nucleus of Swift–Tuttle (26 km), this was of some concern. This prompted amateur astronomer and writer Gary W. Kronk to search for previous apparitions of this comet. He found the comet was [u][b]most likely[/b][/u] observed by the Chinese in 69 BC and AD 188, which was quickly confirmed by Brian G. Marsden. This information and subsequent observations have led to recalculation of its orbit, which indicates the comet's orbit is very stable, and that there is absolutely no threat over the next two thousand years. It is now known that the comet will pass 0.153 AU from Earth on August 5, 2126. It will be a bright naked-eye comet reaching about apparent magnitude 0.7.>>[/quote][quote=" https://en.wikipedia.org/wiki/Lewis_A._Swift"]
<<Lewis A. Swift (February 29, 1820 – January 5, 1913) was an American astronomer. He discovered or co-discovered a number of comets, including periodic comets 11P/Tempel-Swift-LINEAR, 64P/Swift-Gehrels, and 109P/Swift-Tuttle (parent body of the Perseids meteor shower). He was one of the few people to see Comet Halley at two of its appearances, 76 years apart. Apart from comets, he also discovered hundreds of nebulae. One of them is [url=https://en.wikipedia.org/wiki/IC_289]IC 289[/url].
Swift first became interested in astronomy as young boy after observing the Great Comet of 1843 while on his way to school in Clarkson, New York. His teacher initially dismissed his observation, but three days later the 'discovery' of the comet was announced. Swift conducted his early observations in Rochester, NY, 'lain out in the snow' in an alley on Ambrose Street or on the roof of Duffy's Cider Mill. Later he gained a patron in the Rochester patent medicine businessman Hulbert Harrington Warner, who financed the building of an observatory for Swift. A fund of $13,000 was raised to purchase a 16 inch telescope for Swift. Warner went bankrupt in the Panic of 1893, which ended his financial support, and Swift then went to California to become director of Mount Lowe Observatory, taking the 16 inch telescope with him.>>[/quote]