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Hi Ian, Tony,
There hasn’t been a whole lot of t/s on EF Peg over the years – probably because of the difficulties with the close comparison star.
Taichi Kato measured the superhump period during the 1991 superoutburst as 0.08705d (Publications of the Astronomical Society of Japan, Volume 54, Issue 1, 25 February 2002). The Porb is 0.0837d, so yes, the superhump period is longer than the orbital – as expected.
Ian Miller obtained a good run during the 2009 superoutburst (the first observed since 2001). I’m trying to find Ian Millers Psh in my files, but I don’t seem to have it for some reason. If you have Peranso, then you could get Ian’s data from the VSS database and look at it to see if the Psh has changed.
Every time my PC updated the Bios I required a new code from Tonny, so I gave up with Peranso.
Gary
Hi Ian,
I’ve been looking at your t/s this afternoon, and it does indeed look interesting. Good stuff!
UGSS stars tend to get overlooked for long photometric runs (with all the t/s effort saved for UGSU stars), and this has certainly been the case with DX And over the years. Keep up the monitoring if you can.
Gary
Many thanks Jeremy. It is a fabulous book, and that article is very intersting.
Loved the YouTube videos. Not seen them before.
Gary
That’s exactly what it is Ian – orbital hump just prior to eclipse. I’ve seen these before visually, and it can take you by surprise!
Gary
Interesting graphics from NASA in this article. The accretion disc appears to be around the wrong star, with the erupting T CrB occuring in the outer regions of the disc. Wow!
The Mark Garlick cartoon at the top looks good though – as one might expect from him.
Gray
Not wishing to get people’s hopes up, but this interesting ATel #17041 was released just a few moments ago.
Gary
But Robins point on logging in each time is well made. It’s maddening! Why can’t we stay logged in if we want to?
Gary
Hi Paul,
If you’re now a digital subscriber to the BAAJ, you will no longer receive a hardcopy Handbook. These are downloaded from here…
https://britastro.org/document_folder/baa-document-store/the-baa-archives/baa-handbooks
Gary
Yes, it is brightening – and about time too.
Martin Mobberley and I have been working with Mark Kidger on OJ for a long time now (along with several Spanish observers). I’m sure he won’t mind me uploading his most recent plot from a few minutes ago.
We try not to get too excited when OJ does this, but it has been in a low state for a while now, so anything above mag 16 is worth mentioning.
Gary
Attachments:
My SLOOH image, taken on Oct 06.1208UT measures at 13.401CV using the AAVSO chart and sequence.
Ian: I’ll be uploading my CCD observations to the BAAVSS database shortly. The software will detect that this is a new object, and will create a new file with the name I upload it with – which is GOTO065054.49+593624.51 I can’t see any alias in VSX, so it will be this long winded nonsense I’m afraid.
Gary
Thanks Ian. I had 13.2 visual last night, and I also have an unfiltered Slooh image which I haven’t measured yet.
Gary
This looks to be a short duration event, but brightness can change quickly with BL Lac, so it might brighten again. Keep looking!
Gary
