Search found 375 matches

by JohnM
Wed Jun 17, 2020 11:01 am
Forum: Observing
Topic: Noctilucent Cloud - Morning of 17th June 2020
Replies: 2
Views: 287

Noctilucent Cloud - Morning of 17th June 2020

There was a large display of NLC this morning from my location just South of London. I first saw it at at 02:07 UTC (Solar elevation - 10.13 degrees) and was still in progress at 02:46 UTC (Solar Elevation -6.78 degrees) when it was wiped out by dawn. It appeared to stretch for at least the NE to NW...
by JohnM
Wed Jun 10, 2020 12:16 pm
Forum: General chat
Topic: Four Marks Observatory
Replies: 2
Views: 1377

Re: Four Marks Observatory

Geoff, You can have look for information on the observatory on The Astronomical Data system try the following link https://ui.adsabs.harvard.edu/search/p_=0&q=%20full%3A%22Four%20Marks%20Observatory%22&sort=date%20desc%2C%20bibcode%20desc You could also search for the people involved either in the '...
by JohnM
Sun May 24, 2020 8:58 am
Forum: Forthcoming meetings and events
Topic: European Astronomical Society Annual Meeting (virtual)
Replies: 0
Views: 519

European Astronomical Society Annual Meeting (virtual)

The European Astronomical Society were scheduled to hold their annual meeting in Leiden this year but have now gone virtual. The meeting will be held from 29th June to 3rd July 2020. As it is a virtual meeting the price has been reduced to 50 Euros per day or 80 Euros for the whole conference. For t...
by JohnM
Sun May 24, 2020 8:46 am
Forum: Forthcoming meetings and events
Topic: AAVSO / SAA Virtual Meetings
Replies: 0
Views: 282

AAVSO / SAA Virtual Meetings

The American Association of Variable Star Observers combined with the Society for Astronomical Sciences are holding a virtual symposium over 5 weekends starting on Saturday May 30th first weekend is free and $40 for the other 4 weekends. Be aware this uses different conference software to most other...
by JohnM
Tue Apr 28, 2020 7:34 am
Forum: Forthcoming meetings and events
Topic: Virtual Meetings as you cannot attend physical ones
Replies: 2
Views: 830

Re: Virtual Meetings as you cannot attend physical ones

Since my last post the number of Astronomical Societies holding virtual meetings has increased rapidly so there is not room to list them here and it would soon be out of date. One of the interesting things is how wide the audience is for some of the talks - I was watching one last night where viewer...
by JohnM
Thu Apr 02, 2020 6:23 pm
Forum: Forthcoming meetings and events
Topic: Virtual Meetings as you cannot attend physical ones
Replies: 2
Views: 830

Virtual Meetings as you cannot attend physical ones

A number of Astronomical Societies have moved their meetings online so are now open to all to watch and in some cases take part in. Nottingham AS are meeting tonight (2nd April 2020) at 20:00 Edinburgh AS are meeting tomorrow at 19:30 Brighton Astro are meeting on the 14th April at 19:30, interestin...
by JohnM
Fri Mar 27, 2020 3:32 pm
Forum: General chat
Topic: How not to point a telescope
Replies: 2
Views: 565

Re: How not to point a telescope - at the Sun !

I thought you were going to mention the European Southern Observatory pointing their New Technology Telescope at the Sun during the Solar Eclipse ! A quick calculation shows that with a 3.5m telescope like the NTT the power concentrated into the detector would have been around 10kW if they had not m...
by JohnM
Sun Dec 08, 2019 9:44 pm
Forum: Observing
Topic: Venus in Daytime and Rainbow
Replies: 1
Views: 1188

Re: Venus in Daytime and Rainbow

One interesting thing to do with a rainbow is to image it / view it through a polarising filter. At certain angles the rainbow dissapears completely showing the light is polarised. I am nor sure if the polarisation is the same all round the arc as the images I have where I experimented with a polari...
by JohnM
Mon Nov 25, 2019 11:34 am
Forum: Observing
Topic: Alpha Monocerotids 2019 Observations ?
Replies: 3
Views: 847

Re: Alpha Monocerotids 2019 Observations ?

A couple of tips when watching the Video above. 1:play it in HD if possible 2: Slow the playback speed to 0.25 or slower if possible particually around 04:40 when the peak was predicted. 3: The image shows Alpha Mon highlighted with the Yellow Circle. The plate solve is not perfect due to the wide a...
by JohnM
Sun Nov 24, 2019 2:35 pm
Forum: Observing
Topic: Alpha Monocerotids 2019 Observations ?
Replies: 3
Views: 847

Re: Alpha Monocerotids 2019 Observations ?

If this video https://www.youtube.com/watch?v=oHs7ljhQWPA&feature=youtu.be is to be beleived thare were some observed from Tenerife. Space weather.com says 90 but a lot I see seem to be coming from directions other than from the Alpha Mon radiant which is towards the lower left of the images. Around...
by JohnM
Fri Nov 22, 2019 11:30 am
Forum: Observing
Topic: Alpha Monocerotids 2019 Observations ?
Replies: 3
Views: 847

Alpha Monocerotids 2019 Observations ?

Cloudy & raing here in Carshalton for the Alpha Monocerotids this morning. There seemed to be an increase in the frequency of meteors on the IOW2 meteor 'radar' a bit after the predicted peak. Difficult to be sure but I would have said around 04:50UTC. At one stage there were 7 echos in 2 minutes. T...
by JohnM
Fri Nov 22, 2019 11:17 am
Forum: Observing
Topic: Weather makes me sick
Replies: 4
Views: 900

Re: Weather makes me sick

There were a few gaps in the clouds before the Alpha Monocerotids 2019 this morning but by 04:00 it was cloudly & raining. Had to resort to looking and lisening to some of the Meteor Radars.
by JohnM
Thu Nov 14, 2019 3:46 pm
Forum: Observing
Topic: Mercury transit
Replies: 14
Views: 1688

Re: Mercury transit

I observed the transit from Carshalton on the edge of London. Best described as Sunny Intervals. Used a Canon 70D with a 300mm telephoto lens and a Thousand Oaks solar filter. It was very difficult to focus. I am not sure if it was the solar filter confusing the auto-focus or else the turbulance fro...
by JohnM
Fri Nov 08, 2019 8:34 pm
Forum: Observing
Topic: ALPHA MONOCEROTIDS 2019 - possible high rate shower
Replies: 3
Views: 770

Re: ALPHA MONOCEROTIDS 2019 - possible high rate shower

I have also read they are fast & faint so dark sky will help a lot.
by JohnM
Mon Nov 04, 2019 7:11 pm
Forum: Observing
Topic: ALPHA MONOCEROTIDS 2019 - possible high rate shower
Replies: 3
Views: 770

ALPHA MONOCEROTIDS 2019 - possible high rate shower

It has recently been reported that the ALPHA MONOCEROTIDS 2019 may have an outburst at 04:50 UTC on the 22nd November 2019. The dust trail that causes this shower is very narrow and it's position in uncertain as is the parent comet. P. Jenniskens, SETI Institute and NASA Ames Research Center; and E....