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By *og-Man OP Man
over a year ago
somewhere |
Just out walking the dog and can see 2 very bright planets in the sky
Think they're Jupiter and Venus
We've very small in the overall scheme of things really
Anyone into astronomy
Taps fingers waiting on the uranus jokes  |
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By *nribanMan
over a year ago
Sligo |
I love astronomy, but am total amateur. You are correct, Venus and Jupiter and on a clear evening it is a spectacular sight.
I'm starting to dip into Einsteins theory of relativity, and, getting under the skin of it, it is a game changer...of epic proportions.
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"I love astronomy, but am total amateur. You are correct, Venus and Jupiter and on a clear evening it is a spectacular sight.
I'm starting to dip into Einsteins theory of relativity, and, getting under the skin of it, it is a game changer...of epic proportions.
"
Wait til u hit the quantum stuff. That's gonna really bake ur noodle!
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By *iss3BWoman
over a year ago
north down |
"Jupiter and Venus all right.
I caught them the other night and the moon was between them - it was class
Sky lite app "
I seen them Wednesday night, had no idea at time what they were other than the moon, was amazing to see  |
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By *ubal1Man
over a year ago
Newry Down |
"They are very bright. Might be satellites. "
The couldn't be satellites because they're stationary
There are a few things to remember about nocturnal lights:
Satellites are at very low orbits and move rapidly across the sky. The very best example is the ISS- Int'l Space Station.
Planets are often bright, such as at present and they do not twinkle, and are relatively stationary.
Stars twinkle and never change position relative to each other in the night sky.
Part from our own galaxy, the Milky Way, there is only one other large visible galaxy that can be seen with the naked eye, called Andromeda or M31.
The light from Messier 31 takes two million years to reach us, and it is our closest neighbour, apart from the Megallanic Clouds that are not visible from the northern hemisphere on Earth.
Uranus is never a naked eye object being too far away from Earth; the main visible planets are Venus, Mars, Jupiter and Saturn.
Mercury is difficult to see because its orbit is so close to the Sun, the light from which takes only 8 minutes to reach us
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By *oserMan
over a year ago
where the wild roses grow |
"They are very bright. Might be satellites.
The couldn't be satellites because they're stationary
There are a few things to remember about nocturnal lights:
Satellites are at very low orbits and move rapidly across the sky. The very best example is the ISS- Int'l Space Station.
Planets are often bright, such as at present and they do not twinkle, and are relatively stationary.
Stars twinkle and never change position relative to each other in the night sky.
Part from our own galaxy, the Milky Way, there is only one other large visible galaxy that can be seen with the naked eye, called Andromeda or M31.
The light from Messier 31 takes two million years to reach us, and it is our closest neighbour, apart from the Megallanic Clouds that are not visible from the northern hemisphere on Earth.
Uranus is never a naked eye object being too far away from Earth; the main visible planets are Venus, Mars, Jupiter and Saturn.
Mercury is difficult to see because its orbit is so close to the Sun, the light from which takes only 8 minutes to reach us
"
You are quite wrong re your comment about satellites.
There are plenty of earth-orbiting satellites, as such they are in geostationary orbits, which means they appear to hang directly over one particular spot on Earth. They appear to be "stationary" because they have an orbital period of 24 hours, just like earth does.
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By *ubal1Man
over a year ago
Newry Down |
Geostationary satellites are never visible with the naked eye, because they are so far away; 23,500 miles (from memory); the ISS is only a couple of hundred miles above Earth's surface, at the very most, although it does vary because of the need to reboost it's orbit, which decays at a predictable rate.
The ISS is colossal and easily visible, especially with tripod mounted binos.
Geostationary satellites, positioned at a fixed point above the Earth"s surface to serve a specific function as tiny in comparison with ISS.
The new James Webb scope, the replacement for ageing Hubble, is at a fixed point too, but a massive distance away at a special point, the specific name of which eludes me until I consult the NASA website.
The Aurora Borealis is currently spectacular, but I would love to see the Aurora Australis sometime |
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By *oserMan
over a year ago
where the wild roses grow |
Jubal
Not going to get into this too much with you but unlike many objects in low Earth, geostationary satellites are visible all night long every night of the year. They only disappear for up to 70 minutes a day when entering Earth's shadow about two weeks either side of each equinox.
They are all located directly above the equator, continuously staying above the same spot. This position allows satellites to observe weather etc.
Many geosynchronous satellites shine between magnitudes 10–12, so you can easily spot them with the naked eye and improve your view with a basic hand held telescope.
They're also easy to photograph once you have a camera capable of a several-minute-long time exposure — long enough for the stars to trail, so you can easily tell them apart from the satellites.
Assuming geosats are in your field of view, they'll appear at first to drift but thats not whats happening the satellites are actually fixed and the stars are doing the moving, dragged across the field by Earth's rotation.
Right I'm going for a wank  |
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By (user no longer on site)
over a year ago
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"The key takeaway point from this thread is that (mercifully) Uranus is never a naked eye object.
There's some lovely bottoms on here in fairness "
Decided to get my half moon out for the craic  |
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By *og-Man OP Man
over a year ago
somewhere |
"The key takeaway point from this thread is that (mercifully) Uranus is never a naked eye object.
There's some lovely bottoms on here in fairness
Decided to get my half moon out for the craic "
And what a gorgeous craic it is too |
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