David Swan

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Viewing 20 posts - 101 through 120 (of 302 total)
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  • in reply to: Betelgeuse #581847
    David Swan
    Participant

    I thought that they covered the item reasonably well too. Hopefully everyone will be gazing south later this evening, peering through the firework smoke to look at Orion’s right shoulder…

    in reply to: Betelgeuse #581845
    David Swan
    Participant

    Not that often a variable star is featured on the BBC Radio 4 six o’clock news!

    in reply to: Orion’s Arrow #581838
    David Swan
    Participant

    It just doesn’t jump out of my skies. Whilst eta Ori is visible, it is so much less prominent than the belt stars that the arrow pattern does not emerge naturally in my mind. I think that Betelgeuse, Bellatrix and Rigel also frame the middle stars to be perceived as a belt.

    in reply to: Orion’s Arrow #581834
    David Swan
    Participant

    Thanks David. The clouds are forecast to part this evening…. If they do, I will look for the arrow asterism. I have never thought this myself or even been told about it prior to your post.

    in reply to: Mystery comets #581830
    David Swan
    Participant

    Following on from Paul. Defo Bennett. Print 6, morning of 11 Apr 1970; print 7, morning of 10 Apr 1970. I may be wrong, but the bright star to the right of the comet in print 6 may be omicron And, with 2 And even further to the right.

    in reply to: Mystery comets #581829
    David Swan
    Participant

    in reply to: Mystery comets #581817
    David Swan
    Participant

    8P/Tuttle in Nov 1966?

    in reply to: Mystery comets #581813
    David Swan
    Participant

    Following on from Paul:

    I suggest this is C/1969 Y1 (Bennett) at around 1970/04/12 02:00 UT.

    in reply to: Mystery comets #581812
    David Swan
    Participant

    I suggest this is C/1956 R1 (Arend-Roland) at approx 1957/05/20 01:00 UT. Sky Safari places the comet at that time 07 04 55 +63 26 46 J2000.

    in reply to: Mystery comets #581811
    David Swan
    Participant

    I suggest this is 96P/Machholz 1 at approx 1970/06/04 23:00 UT 

    in reply to: Mystery comets #581806
    David Swan
    Participant

    Peter, I’ve had a look in Sky Safari and you are right.

    P2, the brightest star in the frame is Segin, epsilon Cas

    P3, ” ” gamma Cas

    P4, ” ” gamma Cas

    Nicely placed comets! 

    in reply to: Another impact (literally) of Space-X Starlink #581779
    David Swan
    Participant

    Thanks for the info. I read about the project with great interest. On my Twitter account (astro only, no craziness) I’m always retweeting the LSST news feeds to excite my followers about the project.

    in reply to: Another impact (literally) of Space-X Starlink #581776
    David Swan
    Participant

    No doubt the data scientists at the LSST who are developing methods for transient discovery and monitoring are all over this issue.

    in reply to: Another impact (literally) of Space-X Starlink #581773
    David Swan
    Participant

    Good point, Grant.

    On the other thing – I’m sure he’s learned his lesson, notwithstanding the outcome of the case.

    in reply to: Another impact (literally) of Space-X Starlink #581771
    David Swan
    Participant

    I don’t know about the credentials of this news source. But it looks like SpaceX may be testing ways of reducing the reflectivity of the Starlink satellites.

    https://spacenews.com/spacex-working-on-fix-for-starlink-satellites-so-they-dont-disrupt-astronomy/

    in reply to: Lunar N pole features #581758
    David Swan
    Participant

    Going east from Anaxagoras I think you may be looking at craterlets in Goldschmidt – and then on to Barrow. Perhaps the northmost dark feature is Scoresby. There is indeed a ray between Barrow and Scoresby.

    in reply to: Spectra of old novae #581753
    David Swan
    Participant

    Very well deserved Merlin medal. (I missed the early bit of the YouTube stream, but have caught up with all of it now.)

    in reply to: Christmas Meeting #581737
    David Swan
    Participant

    Thanks all. Excellent talks.

    in reply to: SN 2019vxm – a bright IIn supernova in a faint galaxy #581730
    David Swan
    Participant

    I’ll mention the issue to Dominic Ford at the next webops (if he doesn’t pick this up before that).

    in reply to: SN 2019vxm – a bright IIn supernova in a faint galaxy #581727
    David Swan
    Participant

    Taken through a luminance filter only, with zeropoint from UCAC4 R mags, the SN comes out around R = 14.4

    The timestamp is slightly wrong. I leave Astrometrica to take the start of exposures from individual FITS for track and stack (which is correct). It won’t automatically read the midpoint value put in the header by Maxim when I do a prior stack in that software. Of course I could input the midpoint manually into Astrometrica using the image parameters menu…

Viewing 20 posts - 101 through 120 (of 302 total)