Mike Harlow

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Viewing 20 posts - 1 through 20 (of 63 total)
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  • in reply to: Nova Scorpii number 3 #625039
    Mike Harlow
    Participant

    ATel#16808 now has a spectrum.
    Mike.

    in reply to: Nova Scorpii number 3 #625028
    Mike Harlow
    Participant

    That’s great. Looking forward to seeing the results…?
    Mike

    in reply to: Nova Scorpii number 3 #625010
    Mike Harlow
    Participant

    Maybe the BAA should collaborate with the 2SPOT team so we can get spectra of this and other southern novae…?

    Mike.

    • This reply was modified 2 months, 1 week ago by Mike Harlow.
    in reply to: New local Martian dust storm #624346
    Mike Harlow
    Participant

    Clyde Fosters Mars images at: https://www.kwasan.kyoto-u.ac.jp/~cmo/cmons/2024/index_CFs.html
    Click on the longitude to display that days images.

    • This reply was modified 3 months, 1 week ago by Mike Harlow.
    in reply to: Nova Vul 2024 #623969
    Mike Harlow
    Participant

    Grabbed a quick image soon after reading your post. On my members page at: https://britastro.org/observations/observation.php?id=20240731_135808_85400732e67d812d

    Mike.

    in reply to: UV Per #623920
    Mike Harlow
    Participant

    Thanks Gary,
    I imaged it again this morning and as you say it is fading very rapidly. Comparison image attached. Each field is 14 x 14 arc minutes, north up, through a red filter using iTelescope T5

    • This reply was modified 3 months, 3 weeks ago by Mike Harlow.
    in reply to: UV Per #623909
    Mike Harlow
    Participant

    Took an image this morning using iTelescope. Looks more like mag 14.5 through the red filter used.
    Image in the members gallery at: https://britastro.org/observations/observation.php?id=20240729_072219_3fa14af2888e7f59
    I would be interested to see your SLOOH image.
    Mike.

    in reply to: R Lyrae #622576
    Mike Harlow
    Participant

    This all-sky view does show R Lyr as significantly brighter than the blue stars beta and gamma Lyr which are listed as a magnitude brighter. I guess a meteor camera is even more red sensitive.
    Do you have an image you could share?
    Mike.

    in reply to: Variable Star Section Circular 199 now available #621903
    Mike Harlow
    Participant

    Just a small correction. In the all sky image on page 6 the cross marks the centre of the field NOT T CrB. Corona Borealis is at the top of the image, easy enough to find starting from Arcturus…
    Mike.

    in reply to: JBAA Feb 2024 out now? #621442
    Mike Harlow
    Participant

    But ‘Astronomy Now’ are advertising the 2004 BAA Deep Sky section annual meeting…!!! It must have been a good one.
    Astronomy Now, February 2024 page. 69.

    in reply to: Images not uploading #617569
    Mike Harlow
    Participant

    Hi John,
    I’ve had this problem before as well. Upload an image, type in all the details, save and then…nothing, blank! I soon realised that, in my case anyway, it was that the image file exceeded the 2Mb limit. Reducing the file size below 2Mb solved the problem.
    Hope that helps?
    Mike.

    in reply to: Winchester Weekend #616991
    Mike Harlow
    Participant

    So I can watch a video from 1972 but not 2023?!

    in reply to: Winchester Weekend #616969
    Mike Harlow
    Participant

    Are there videos of the talks so we can all enjoy them???

    in reply to: Mercury’s socium tail #616965
    Mike Harlow
    Participant

    Nice piece on Spaceweather.com about this: https://www.spaceweather.com/archive.php?view=1&day=15&month=04&year=2023
    So +/- 16 days from perihelion is the best time to image it.
    Mike.

    • This reply was modified 1 year, 7 months ago by Mike Harlow.
    in reply to: iTelescope, New Mexico #615214
    Mike Harlow
    Participant

    Thanks Martin,
    I thought it was a bit weird when the all-sky camera in New Mexico suddenly said it was in Utah Desert! But still looks like there is some commissioning work to do before we can start using them again.
    Looking forward to seeing more of your comet images!
    Mike.

    • This reply was modified 1 year, 10 months ago by Mike Harlow.
    in reply to: iTelescope, New Mexico #615165
    Mike Harlow
    Participant

    Thanks David,
    I’ve now had a detailed reply from Mladen explaining the situation, so all is good. Looks like they will be back in action next week as you mention above.
    Thanks,
    Mike.

    in reply to: Nova Vul 2021 #584477
    Mike Harlow
    Participant

    Just had a quick look at the object through the objective prism and as Robin has shown above there are strong H alpha and beta emission lines.

    in reply to: Mirror re-coating #584462
    Mike Harlow
    Participant

    Thanks for the info Robin, very interesting.

    Looks like going back to silver is the best option for the UV!!!

    Mike.

    in reply to: Mirror re-coating #584459
    Mike Harlow
    Participant

    Hi Bill,

    I had a Hi-Lux coating put on my 12 inch mirror by Orion Optics a few years ago and it is still in good condition.  I haven’t examined it recent for pinholes but it still looks uniformly bright despite several years outside in the observatory. So I’m happy with it.

    One thing that may be an issue is the reflectivity in the UV and IR, outside the ‘visible’ range.  When doing spectroscopy I get the impression I’m not seeing as far into the UV or IR ends as I did when using just a plane old aluminium coating.  I haven’t quantified this and it’s not really a significant problem but maybe something to investigate?  I did contact Orion Optics to ask what the reflectivity was beyond their specified range of 400-700nm but the customer service person didn’t seem to understand the question(!).  

    Mike.

    in reply to: Nova in Hercules #584358
    Mike Harlow
    Participant

    Yes, much fainter than I was hoping for but still bright enough for a low resolution spectrum:

    Very broad hydrogen lines dominated by H alpha emission.

    Mike.

    [26cm, 3 degree objective prism on 30cm F/6.8 astrograph.  6 x 15 seconds at ~23:30BST 13th June 2021]

Viewing 20 posts - 1 through 20 (of 63 total)