Search found 5818 matches

by brian livesey
Sun Oct 24, 2021 9:34 pm
Forum: Telescopes and instruments
Topic: Tiny Monolithic Schmidt Cassegrain telescope
Replies: 8
Views: 56

Re: Tiny Monolithic Schmidt Cassegrain telescope

How much light is lost in transmission through all that glass?
by brian livesey
Sun Oct 24, 2021 7:14 pm
Forum: Observing
Topic: Nova in Cassiopeia
Replies: 106
Views: 3867

Re: Nova in Cassiopeia

How do you manage to handhold a 80mm/f.5 refractor steady for observations Bob? I have the same spec. refractor and it’s too heavy to hold for me. Mind you, I’m an old-timer so many things are not as a easy as they used to be.
by brian livesey
Sun Oct 24, 2021 1:05 pm
Forum: Telescopes and instruments
Topic: DIY: Homemade Vixen Mount (all thumbs)
Replies: 4
Views: 52

Re: DIY: Homemade Vixen Mount (all thumbs)

White light observations are interesting, but in Ha the Sun really comes alive. :D
by brian livesey
Tue Oct 19, 2021 2:57 pm
Forum: Telescopes and instruments
Topic: DIY: Homemade Vixen Mount (all thumbs)
Replies: 4
Views: 52

Re: DIY: Homemade Vixen Mount (all thumbs)

Yep Mike, that is a bad case of casting and/or machining. I have a 70mm/f.10 Skylux refractor on a neat equatorial mounting. The ‘scope’s okay, but at high powers there’s some astigmatism evident. I now use the Skylux as a Stage1 PST-mod. It shows the solar prominences quite well, better than throug...
by brian livesey
Sat Oct 16, 2021 4:29 pm
Forum: Space exploration
Topic: Lucy’s asteroid odessey
Replies: 0
Views: 43

Lucy’s asteroid odessey

The launch of asteroid probe Lucy’s mission to the asteroid belt and beyond will be to gain information from primordial material from the early formation of the Solar System. Lucy will visit eight asteroids, one in the main belt and seven ancient Trojan asteroids. The Trojans are associated with Jup...
by brian livesey
Sat Oct 16, 2021 6:09 am
Forum: Observing
Topic: Three Comets Near Auriga
Replies: 8
Views: 68

Re: Three Comets Near Auriga

Yes, with Mickey Mouse :wink: .
by brian livesey
Fri Oct 15, 2021 9:05 pm
Forum: Observing
Topic: Three Comets Near Auriga
Replies: 8
Views: 68

Re: Three Comets Near Auriga

In theory Jeff, Pluto should be visible in a 5-inch refractor, given ideal sky conditions and acute vision.
by brian livesey
Fri Oct 15, 2021 8:41 pm
Forum: Space exploration
Topic: Aussie moon rover
Replies: 0
Views: 30

Aussie moon rover

Australia has agreed a deal to built a 20kg (44lb) oxygen-seeking lunar rover as part of Nasa’s Artemis programme. Australia is a major player in robotics and semi-autonomous systems. NASA was impressed by Australia’s huge semi-autonomous ore carrying vehicles that are controlled from a distance of ...
by brian livesey
Fri Oct 15, 2021 7:37 pm
Forum: Observing
Topic: Three Comets Near Auriga
Replies: 8
Views: 68

Re: Three Comets Near Auriga

It’s possible to see Pluto in a 20cm reflector, assuming a good dark sky.
by brian livesey
Thu Oct 14, 2021 6:33 pm
Forum: General chat
Topic: A suborbital risk ..
Replies: 0
Views: 55

A suborbital risk ..

We might think that with the media circus surrounding Blue Origin’s suborbital flights, that there’s something unique about them, but it was way back in the early ‘Sixties that the first suborbital flight was performed by Alan Shepard, on a Redstone rocket. There were risks involved in the first sub...
by brian livesey
Tue Oct 12, 2021 7:35 pm
Forum: Astrophysics
Topic: Finding hidden planets
Replies: 1
Views: 61

Finding hidden planets

Researchers at the University of Queensland and at the Dutch national observatory, ASTRON,think they have discovered stars with possible hidden planets. The astrophysicists used the biggest radio telescope of its type in the world, Lofar ( Low Frequency Array ), to detect radio waves from red dwarfs...
by brian livesey
Tue Oct 12, 2021 4:56 pm
Forum: Gallery
Topic: The Sun - 11th October
Replies: 1
Views: 58

Re: The Sun - 11th October

Nice images Cliff. Especially your red tinted Ha image that shows the proms well.
by brian livesey
Tue Oct 12, 2021 4:53 pm
Forum: Observing
Topic: Scottish auroral display
Replies: 1
Views: 44

Scottish auroral display

There was an impressive auroral display up North last night, due to a G2 coronal mass ejection earlier in the week. The CME hit the Earth more-or-less head on.
More impressive displays are possible tonight, but not here further south under cloud-laden skies.
by brian livesey
Mon Oct 11, 2021 1:38 pm
Forum: Observing
Topic: Counting sunspots
Replies: 9
Views: 105

Re: Counting sunspots

The wedge has been used and proven for a long time. It’s perfectly safe when correctly filtered.
by brian livesey
Sun Oct 10, 2021 10:17 am
Forum: Observing
Topic: Counting sunspots
Replies: 9
Views: 105

Re: Counting sunspots

Sunspot AR12882 produced a powerful flare and coronal mass ejection that blacked out shortwave radio in the Indian Ocean. See today’s www.spaceweather.com .