If his motor was off he would be traveling at the same speed (relative to the launch site) as he was when he cut the engines. Either with the motor on would still be accelerating, not at a constant speed. Unless there is still some air pressure to deal with. If that’s true “You’re right! It’s not high enough!”.
Comet Nishimura is predicted to become bright enough to see with the naked eye around Sept. 12, 2023 when it gets closest to Earth, through to Sept. 17 when it gets closest to the Sun.
However, beware the sensationalist reports in the press of naked eye visibility as they don't mention that the comet will be lost in the bright post-sunset twilight during this time.
https://www.forbes.com/sites/jamiec...ing-new-comet-nishimura-with-your-naked-eyes/
Below is the 30 second standard digital camera image taken by discoverer Hideo Nishimura on Aug. 12, 2023. Comet Nishimura is described as a star-like blob surrounded by a ghostly green glow.
Let's hope this comet will be a herald of good news!
However, beware the sensationalist reports in the press of naked eye visibility as they don't mention that the comet will be lost in the bright post-sunset twilight during this time.
https://www.forbes.com/sites/jamiec...ing-new-comet-nishimura-with-your-naked-eyes/
Below is the 30 second standard digital camera image taken by discoverer Hideo Nishimura on Aug. 12, 2023. Comet Nishimura is described as a star-like blob surrounded by a ghostly green glow.
Let's hope this comet will be a herald of good news!
Comet Nishimura, which was discovered in August, will be closest to Earth just before dawn on Tuesday, September 12 – giving the best opportunity to see it.
Professor Brad Gibson, Director of the E.A. Milne Centre for Astrophysics at the University of Hull, said that the comet is already visible to the naked eye around the hour after sunset and the hour before dawn.
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It can already be seen but it will be 78 million miles from Earth on September 12 and that should be the best chance to see it with the naked eye
Sky at Night
Train your binoculars, cameras and telescopes to the north-east, where P1 is waiting for you.
It's not far from Venus, heading for its close encounter with the Sun.
They say might be visible. There seems to be some doubt about the maximum magnitude it will reach. Venus is pretty obvious as it's rather bright. Elevation ~ where the Sun tracks it's path during the day.
Professor Brad Gibson, Director of the E.A. Milne Centre for Astrophysics at the University of Hull, said that the comet is already visible to the naked eye around the hour after sunset and the hour before dawn.
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It can already be seen but it will be 78 million miles from Earth on September 12 and that should be the best chance to see it with the naked eye
Sky at Night
Train your binoculars, cameras and telescopes to the north-east, where P1 is waiting for you.
It's not far from Venus, heading for its close encounter with the Sun.
They say might be visible. There seems to be some doubt about the maximum magnitude it will reach. Venus is pretty obvious as it's rather bright. Elevation ~ where the Sun tracks it's path during the day.
You wrote: "Hey, anyone notice the similarity between E = 1/2mv2 and e = mc2?"
Look at E = m c^2 + 1/2 m v^2, where E is the total energy possessed by a mass m moving at speed v (v < 20% of c).
Only the first part, m c^2, represents the energy equivalence of the mass, i.e., the energy "locked up" in the mass.
The second part, 1/2 m v^2, represents the kinetic energy of the mass, i.e., the energy it possesses due to its movement.
Hope that clears it up.
A parallel technology has already been established on Earth.
The world's largest liquid mirror telescope is located at the Devasthal Observatory in India's Himalayas.
The 4 metre mirror is made from a thin layer of liquid mercury that floats on 10 microns of compressed air and rotates once every eight seconds, causing the liquid mercury to form a parabolic shape. https://www.space.com/largest-liquid-mirror-telescope-opens-india
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The idea has been around for a long time. 😉 Very good at detecting passing traffic when there was far less around than there is now.
1/10 max surface error is seen as a decent metric along with smoothness making rms measurements dubious. Usually based on a wavelength of 550nm for visual use.
Can you explain that in more simple terms to a ‘scope novice?
Separatel, I’m trying to talk the wife into letting me get one of these bad boys
Separatel, I’m trying to talk the wife into letting me get one of these bad boys
I’m thinking of housing it in a purpose built enclosure in my yard. But I am willing to take advice on this from more experienced people.
Is there a difference between a tracking scope (so I can hook a camera up) and a ‘go to’ computer controlled scope? I am really only interested in deep sky observations
Nothing new, i recall, i had this explained in engineering school in the 60s. With proof that the rotation induces a parabolic surface
The new technology mentioned by Bonsai does not involve rotation - check out his link from which I have extracted the following quote.
A weather proof enclosure would be great, no setup, and no temperature stabilization are needed.
Check out what some other amateurs have done. Some enclosures will limit the parts of the sky that are accessible.
Computer scopes can track for photography. Make sure there are no lights in the area to interfere though.
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Steve may be interested in this
https://www.quantamagazine.org/alan-turing-and-the-power-of-negative-thinking-20230905/
https://www.quantamagazine.org/alan-turing-and-the-power-of-negative-thinking-20230905/