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Hi Kevin,
For what size OTA?
I use LED flat panels for my kit (is that what you mean by a pad?). I have an A3 size panel which covers my C11 ok. I have a smaller Pegasus Astro Flatmaster panel which covers my refractors and is dimmable and USB controllable. There are lots of choices of LED Flat panels out there now.
These look nice: https://www.widescreen-centre.co.uk/aurora-flatfield-panels.html
Cheers
Ian.Hi all,
It looks to be slowly dimming again. I got Vmag = 11.62 and Bmag = 12.42 last night. See attached.
Cheers
Ian.Attachments:
Thanks for the info Gary,
I managed a decent set of R, V and B last night from Spain. V mag was coming out at around 14.6 with R at about 14.2.
All uploaded into the dB.
Cheers
Ian.Hi all,
I got some nice results last night in B and V – 10 images of each. I get 11.43 in V and 12.16 in B and it looks to be brightening from David and Gary’s recent points. See attached.
Cheers
Ian.Attachments:
Hi all,
My B mag. measurements from last night suggest a bit of a rise in the past few days. Hope to check this again tonight.
Wow! Just been watching Brad Schaefer’s presentation. This is so exciting! Now I understand why the call for B-band photometry.
Marvellous!
Ian.
They said there would be a video available shortly.
Here it is: https://fb.watch/mZhv9T6ax3/
Cheers
Ian.Certainly looks like it Ian. My efforts attached.
Hi Gary,
Excellent!
Here’s my update as of last night. I had three rainy nights in a row in Spain!
Cheers
Ian.Attachments:
Thanks Jeremy,
I managed to get an 11th mag comparison star in the FOV and that has improved things.
Here’s another 2 hour B run from last night.
Cheers
Ian.Attachments:
Hi Jeremy,
I’ve been monitoring T CrB for a couple of months in R, V and B and have noticed much more variability in B, but it has not made any significant shifts until last night when I managed a longer run over about 2 hours. See the attached graph.
The problem I have so far is that my reference and check stars are a good 2 mags. fainter because of the tight FOV of my C11 setup. I’ll try and offset the FOV a tad to fit in a brighter ref star or two.
Cheers
Ian.Attachments:
Are these suitable to get started in CMOS photometry. Does anyone in BAA have experience of using them?
Hi Kevin,
Yes, I use these filters, but I only use the R, V and B. I would forget ‘U’, but the ‘I’ can be useful. I use them with a CCD camera, but no problems with a CMOS camera.
As well as photometry, I also use them for colour imaging as there is not enough room in my 7-pos filter wheel for a standard set of RGB filters. I have the following filters: L, R, V, B, Ha, OIII, SII, and this works very well for everything.
Best Regards
Ian.Hi all,
Last night’s results seem to suggest the start of a plateau? See attached graph.
Best Regards
Ian.Attachments:
In addition, I think we can make your “It’s turned back up again!” statement a little more quantitative.
Hi Jane,
Yes, of course my comment was conversational, if a bit glib!
I’ve sent you a PM with the Excel file attached.
Ian.
I see from the light curve the slow steady decline (~2 magnitudes in V over 70 days) has come to an end and the brightness is now dropping rapidly (~1.5 magnitudes in 12 days)
Hi Robin,
Yes, and it’s turned back up again! See attached graph as of last night’s data…
Cheers
Ian.Attachments:
Hi all,
With regard to may last post. New data from last night reveals that the slow decline continues!
Ian.
Hi all,
It’s been quite a few days since my last update but I have been manfully soldiering on measuring mags with the 3 RBV filters and I’ve barely missed a night!
I was talking to Robin Leadbeater at the excellent BAA Comet Section Meeting yesterday whether he thought that SN 2023ixf was a Type II-L or Type II-P. We both agreed that, since there has been no sign of a plateau to-date, it must be a Type II-L. However, now I’ve added last night’s data all three colours seem to be showing the beginnings of a sharp bend to a flat line (see attached graph – look at the last 2 square points on each line).
I’d be interested in any comments. Maybe the next couple of nights will tell!
Best Regards
Ian.Attachments:
Unfortunately I was just too young to go on the Monte Umbe trip (15y), but I was old enough to go to Earls Court to see Pink Floyd in May of ’73 to hear the whole of Dark Side of the Moon live. An eclipse is just an eclipse, but this gig will never be forgotton! I have no regrets.
Interestingly, EMI gave a press reception at the London Planetarium in February 1973 just after the release of DSOTM, but only Richard Wright of the band attended. The others were not happy with the inferior sound system brought in by EMI. Fussy lot these rock gods
Gary
Indeed! I didn’t make the DSotM tour in ’73 but did go to see them at Wembley in ’74 (I was 14) thanks to a huge trip organised by our very own Dr John Mason! There were two coaches that went from the Chichester High School for Boys!
