Nick James

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Viewing 20 posts - 501 through 520 (of 882 total)
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  • in reply to: An independent discovery of Neptune ? #581674
    Nick James
    Participant

    At least when Peter Dunsby discovered Mars (AT 11448 here) he was presented with a nice certificate.

    in reply to: An independent discovery of Neptune ? #581673
    Nick James
    Participant

    As you say, that’s minor planets. Perhaps we should send them a link to Dominic’s site: https://in-the-sky.org/data/planets.php

    in reply to: An independent discovery of Neptune ? #581670
    Nick James
    Participant

    Seriously, if an amateur did this they would be crucified although at least we are trusted to post discoveries on TNS. We are not allowed to post to The Astronomer’s Telegram since we can’t be trusted to get things right on our own. I’d be interested to know what checking the MASTER team do before posting their discoveries. Checking for moving objects like asteroids and planets is pretty basic stuff. It would be nice to see a comment on TNS from one of the authors explaining what went wrong but so far nothing.

    in reply to: A meteor trail? #581663
    Nick James
    Participant

    Possibly. It could have been an aircraft I suppose but the faint residual image in the next frame looks like a decaying train.

    in reply to: An independent discovery of Neptune ? #581660
    Nick James
    Participant

    Well done them. You’d have thought that one of that almost infinitely long list of authors might have checked…

    in reply to: Balloon-borne meteor video observations #581650
    Nick James
    Participant

    That sounds like a fun thing to do although recovering your expensive kit might be challenging. There are rules about launching high altitude met balloons in the UK and a useful FAQ here in case anyone wants to have a go.

    in reply to: Prediction of high activity of alpha Monocerotid shower #581628
    Nick James
    Participant

    Rotten weather here in Chelmsford although my cameras caught a few meteors last night during short gaps in the cloud. There were only small gaps in the cloud at the predicted time of the storm and nothing was picked up then.

    in reply to: Transit of Mercury #581565
    Nick James
    Participant

    At 13:47:19. Is it an MD-11?

    in reply to: Transit of Mercury #581561
    Nick James
    Participant

    Lots of showers this morning and a load of clouds around. The seeing is awful and it is blowing a gale but I was lucky at first contact here in Chelmsford. Here is a frame from my video taken at 2019-11-11T12:37:33.

    Here’s the animated GIF of first and second contact.

    in reply to: 1998 HL1: upcoming fly-by #581538
    Nick James
    Participant

    David. Excellent. I can breath easy now.

    in reply to: 1998 HL1: upcoming fly-by #581527
    Nick James
    Participant

    Yes, 13.4 tonight and moving along at almost 18 arcsec/min.

    in reply to: 1998 HL1: upcoming fly-by #581521
    Nick James
    Participant

    Here’s a quick animation I obtained tonight while waiting for it to get dark. These are 10s exposures. 33×22 arcmin field, N up.

    in reply to: 1998 HL1: upcoming fly-by #581499
    Nick James
    Participant

    That is a lot of objects to track and control too.

    in reply to: 1998 HL1: upcoming fly-by #581497
    Nick James
    Participant

    Thanks. Here’s a short movie taken a little later when it had cleared up. Still a very bright Moon in the sky.

    in reply to: 1998 HL1: upcoming fly-by #581495
    Nick James
    Participant

    Thanks for the reminder. That’s a great movie. It is cloudy here in Chelmsford at the moment but I did have a few gaps earlier and caught the trail. It is currently around mag 15.3 moving at 7 arcsec/min.

    in reply to: Non-Windows stacking software. #581462
    Nick James
    Participant

    https://openphdguiding.org/man-dev/Tools.htm#Comet_Tracking

    Although I have never used this myself…

    in reply to: Non-Windows stacking software. #581452
    Nick James
    Participant

    Well, given the position, it is possibly Leda but I don’t think you could be sure unless you had multiple stacks which showed the blob moving at the correct rate. If you try this in future you will want to get a long enough series of subs that you can make two separate stacks, each of which have enough SNR to get astrometry of the object. Once you have confirmed it by its motion you can always stack the whole set to get a higher SNR. That’s what I did with this faint comet which was about the same magnitude as Leda.

    in reply to: Non-Windows stacking software. #581449
    Nick James
    Participant

    Good try Paul but that’s the trouble with faint objects in busy starfields! When you say it is “in about the right place” could you quantify in terms of arcsec? Leda’s ephemeris will be very good. Normally, in cases like this, you would produce two stacks at different times and check that the object’s motion is consistent with the ephemeris.  You may not have enough subs to do this in which case the identification will always be iffy.

    in reply to: Non-Windows stacking software. #581444
    Nick James
    Participant

    Try this:

    http://www.nickdjames.com/astrolinux/utils_ubuntu18.tgz

    The tools are all dynamically linked so you will need the libraries but they are all available for Ubuntu. I think the following should get them all:

    apt install libcfitsio-dev
    apt install libgd-dev
    apt install libnetpbm10-dev
    apt install wcslib-dev

    Nick.

    in reply to: Non-Windows stacking software. #581442
    Nick James
    Participant

    Paul,

    I have a VM running Ubuntu 18.04  LTS. I’ll build you a version of the tools in that. Hopefully that will work on your system. If not I’ll have a look at linking the libs statically and, failing all that I’ll give you the source (with an NDA!).

    Nick.

Viewing 20 posts - 501 through 520 (of 882 total)