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by rwilkinson
Fri Sep 20, 2019 12:42 pm
Forum: Astronomical events
Topic: Comet Africano (2018 W2)
Replies: 1
Views: 762

Comet Africano (2018 W2)

I got another image of this comet last night. It's now up to 9th magnitude, and moving quickly through Andromeda.
So quickly that I had to re-point my 'scope mid-way through the imaging run!
africano_19sep.jpg
Comet Africano on 19-Sep. 52x 60-sec with Mx716 on C8 at f/3.5.
africano_19sep.jpg (28.46 KiB) Viewed 762 times
by rwilkinson
Sun Sep 08, 2019 9:27 pm
Forum: Astronomical events
Topic: Two comets for the price of one?
Replies: 2
Views: 956

Re: Two comets for the price of one?

Last night for once, whilst it was cloudy in Spain and New Mexico, the skies were clear in Bolton!
So I set up a little imaging system pointing through an upstairs window, to catch the comets as they cleared the tall trees in the Park:
2comets.jpg
The two comets from Bolton in the early hours of 8-Sep. 35x 120s with 200mm telephoto lens on Hx916 camera
2comets.jpg (97.41 KiB) Viewed 930 times
by rwilkinson
Sat Sep 07, 2019 7:27 am
Forum: Astronomical events
Topic: Two comets for the price of one?
Replies: 2
Views: 956

Re: Two comets for the price of one?

I've just got an image from an iTelescope in New Mexico:
2comets.jpg
Comets 260P & 2018 N2 from iTelescope T5. 3x 120s with 250mm f/3.4.
2comets.jpg (252.42 KiB) Viewed 936 times
260P is the one near the centre of this field.
This time I was operating the telescope "live", rather than waiting to get the data back from a pre-submitted job.
by rwilkinson
Wed Sep 04, 2019 7:10 am
Forum: Astronomical events
Topic: Two comets for the price of one?
Replies: 2
Views: 956

Two comets for the price of one?

This weekend there will be a "conjunction" of two comets: 260P/McNaught and C/2018 N2 (ASASSN) in the constellation of Aries . At their closest (during the afternoon of the 7th) they appear within 10 arc-minutes of each other, but they remain within half a degree through the previous and following n...
by rwilkinson
Tue Sep 03, 2019 1:04 pm
Forum: Astrophotography
Topic: Untried filter
Replies: 5
Views: 1682

Re: Untried filter

IRIS uses "signed 16-bit" numbers, i.e. between -32726 and +32767. so you're saturating in the G & B channels. So you must use the "Normalise" process: this automatically re-scales the totals to prevent saturation. And you could try boosting the Red channel using the RGB Balance panel, or the >RGBB...
by rwilkinson
Mon Aug 26, 2019 8:52 am
Forum: Astrophotography
Topic: Untried filter
Replies: 5
Views: 1682

Re: Untried filter

bchamberlain wrote:
Sun Aug 25, 2019 10:59 am
The BG in iris reads 2820 which seems a bit high.
Could that be just down to the high ambient temperature?
My imaging session on Saturday night produced a number of hot-pixels from my Mx716 camera which I hadn't seen before!
by rwilkinson
Sun Aug 25, 2019 9:44 am
Forum: Member Observations - Blogging
Topic: The first night of the winter?
Replies: 4
Views: 6682

Re: The first night of the winter?

Last night I went out to set up my C8 'scope and mount, to have a look for Comet Africano . I had a false-start: after setting up my tripod and doing a polar alignment, I realised that there was a tree in the way of my target! Eventually I had to move the green wheelie-bin to make space to set up wi...
by rwilkinson
Sun Aug 18, 2019 6:59 am
Forum: Physics, Space Science and Theories
Topic: "13 Minutes to the Moon"
Replies: 11
Views: 3879

Three years to the Moon

Here's another gem from the early years of manned space-flight: a (black & white) edition of Horizon from May 1966: https://www.bbc.co.uk/iplayer/episode/p01z4mj0/horizon-19651966-man-in-space It includes a tour of the Gemini capsule, and interviews with Frank Borman and Walt Cunningham . And the ye...
by rwilkinson
Sat Jul 20, 2019 1:20 pm
Forum: Physics, Space Science and Theories
Topic: "13 Minutes to the Moon"
Replies: 11
Views: 3879

Re: "13 Minutes to the Moon"

The last episode is a live forum recorded at Rice University, Texas (the site of President Kennedy's historic speech) : https://www.bbc.co.uk/programmes/w3csz534 This includes Apollo 7 astronaut Walt Cunningham and Mission Controllers Gerry Griffin and John Aaron giving their recollections of the da...
by rwilkinson
Fri Jul 19, 2019 10:40 am
Forum: Club events
Topic: 2nd July - an evening of rockets!
Replies: 11
Views: 4914

Re: 2nd July - an evening of rockets!

The night before our launches, I'd met up with Gary Hawkins, an old friend on holiday from San Diego (you may recall that a couple of years ago he wrote an article for our newsletter about his experiences with an 8" Dobsonian in California). I'd told him about our planned rocket-night, and then sent...