Search found 512 matches

by JohnM
Mon Oct 11, 2021 9:26 am
Forum: Visual Satellite Observing
Topic: Sutherland satellite launch site legal challenge
Replies: 19
Views: 423

Re: Sutherland satellite launch site legal challenge

During the RAS live observing URANUS broadcast this weekend there was an interview with members of the Bath Astronomical Society. They have 5 Meteor detection cameras that observe the night sky looking for meteor trails and possible meteorites such as the Winchcombe fall. One morning recently they w...
by JohnM
Thu Sep 30, 2021 10:29 am
Forum: Visual Satellite Observing
Topic: Sutherland satellite launch site legal challenge
Replies: 19
Views: 423

Re: Sutherland satellite launch site legal challenge

SpaceX seem to be more transparent about what they are doing than other companies though there is still a lot of information they have not released like the shape & reflectance model so it is not possible to calculate the brightness accurately. The newer SpaceX satellites are all in low orbit to...
by JohnM
Wed Sep 29, 2021 10:59 am
Forum: Visual Satellite Observing
Topic: Sutherland satellite launch site legal challenge
Replies: 19
Views: 423

Re: Sutherland satellite launch site legal challenge

Interesting I had not realised that someone had been hit by space launch debris and survived. There are various rumours about deaths from the Russian launch vehicles but some of those if they happened may be due to people coming into contact with toxic chemicals when salvaging metals from launch veh...
by JohnM
Wed Sep 29, 2021 9:55 am
Forum: Visual Satellite Observing
Topic: Sutherland satellite launch site legal challenge
Replies: 19
Views: 423

Re: Sutherland satellite launch site legal challenge

It is interesting to note the launch vehicle for Landsat 9 performed a de-orbit burn above the north of the UK a couple of days ago (see separate thread) looking at the orbit on heavens above ([s.n.49260] - Satellite Information - {it is not identified as landsat -9 yet on heavens above}) it looks a...
by JohnM
Fri Sep 24, 2021 12:29 pm
Forum: Visual Satellite Observing
Topic: ISS pass 20210923 20:40 BST
Replies: 0
Views: 90

ISS pass 20210923 20:40 BST

Was anyone else watching the 21:40 ISS pass on 23rd September ? If so did you notice a second satellite to the south at about mag 0 and travelling in a similar direction. Edit for clarity the times in BST from Heaven's above were Visible at 20:46 , Highest Point 20:50:22 & in shadow at 20:56:56 ...
by JohnM
Fri Sep 24, 2021 11:04 am
Forum: Visual Satellite Observing
Topic: Sutherland satellite launch site legal challenge
Replies: 19
Views: 423

Re: Sutherland satellite launch site legal challenge

I found a diagram on this site https://www.aspistrategist.org.au/started-australias-early-days-space-woomera/ of where the first & second stages were planned to fall in launches of the Europa rocket from Australia. It gives an indication of the distances to the down range crash points but no act...
by JohnM
Thu Sep 23, 2021 7:11 pm
Forum: Visual Satellite Observing
Topic: Sutherland satellite launch site legal challenge
Replies: 19
Views: 423

Re: Sutherland satellite launch site legal challenge

In terms of the problems of where the first & second stages land there is an interesting talk on YouTube at https://www.youtube.com/watch?v=tESNNDBEjAs on the history of Skylark. An early part shows the range at Woomera in Australia and how they had to try to avoid the homesteads. Also all the h...
by JohnM
Tue Sep 21, 2021 1:21 pm
Forum: Visual Satellite Observing
Topic: Sutherland satellite launch site legal challenge
Replies: 19
Views: 423

Re: Sutherland satellite launch site legal challenge

I thought most of the first & second stages fall back to Earth. They don't have the velocity to get into orbit and I am not sure they have the velocity to burn up. Also being of relativity low density (one the fuel is burnt) they have a fairly low terminal velocity. The only first stage I have s...
by JohnM
Mon Sep 20, 2021 11:14 am
Forum: Visual Satellite Observing
Topic: Sutherland satellite launch site legal challenge
Replies: 19
Views: 423

Re: Sutherland satellite launch site legal challenge

The problems of where to drop the first and second stages was one of the reasons the intermediate range nuclear missiles were withdrawn from the UK. From what I remember they were being launched from Norfolk and the first stage dropped into the North Sea and the second crashed into the North of Norw...
by JohnM
Fri Sep 17, 2021 2:25 pm
Forum: Visual Satellite Observing
Topic: Sutherland satellite launch site legal challenge
Replies: 19
Views: 423

Re: Sutherland satellite launch site legal challenge

Unfortunately geography is probably the most important factor in selection of a launch site. 1: Near the equator to get a speed boost from the Earth's rotation 2: 'Empty' sea area to the East for the 1st & second stages to fall into. This is the reason Ariane Space launce from South America and ...
by JohnM
Tue Sep 14, 2021 1:54 pm
Forum: Visual Satellite Observing
Topic: Sutherland satellite launch site legal challenge
Replies: 19
Views: 423

Re: Sutherland satellite launch site legal challenge

What people seem to ignore is that only a very small part of the launch vehicle mass gets into space. The burning of the propellant results in atmospheric pollution but the first & second stages crash back to the Earth's surface . In most cases these fall into the Ocean but in some countries tha...
by JohnM
Mon Sep 13, 2021 7:07 pm
Forum: Computers and astronomy
Topic: Softwares for Your (my) Sky Tonight
Replies: 5
Views: 219

Re: Softwares for Your (my) Sky Tonight

Hi Jeff, You need to be careful with |Redshift - I think the online versions that have had the protection software removed may be contaminated by various viruses. Same as a lot of other 'cracked' software. Try Aladin - if you are looking for information on objects it is really good but needs an onli...
by JohnM
Mon Sep 13, 2021 6:06 pm
Forum: Computers and astronomy
Topic: Softwares for Your (my) Sky Tonight
Replies: 5
Views: 219

Re: Softwares for Your (my) Sky Tonight

Cartes du Ciel should be easy to install. At least it installs on Linux with no problems and I can't remember any when I installed it on Windows XP & 7 in the past but with modern windows protection mechanisms I have no ideas but the user group is pretty helpful. You can also install Aladin quit...
by JohnM
Wed Sep 08, 2021 4:33 pm
Forum: Pop Astro Live
Topic: Change of Day
Replies: 2
Views: 66

Re: Change of Day

It all depends on how big an audience she wants !! :)

and of course how competitive she is against the rest of the virtual astronomy world.
by JohnM
Wed Sep 08, 2021 11:20 am
Forum: Pop Astro Live
Topic: Change of Day
Replies: 2
Views: 66

Change of Day

Anyone got any comments about the change to Tuesday - I guess there are no perfect days to choose. Fridays seems very busy but most days seem to have some virtual meetings. Tuesday is the normal day for Dave Eagle's Virtual Astronomy club but that is not resuming until nearer the end of September bu...