Nick James

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Viewing 20 posts - 281 through 300 (of 994 total)
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  • in reply to: Journal delays #614912
    Nick James
    Participant

    I still don’t have mine in Chelmsford but the mail is pretty terrible at the moment and I’ll give it another couple of weeks before I request a replacement.

    in reply to: Astronomy in the media #614903
    Nick James
    Participant

    Ta David. I’ll keep this one on file. Good to see the quality press providing a worthy entry in a category normally dominated by the tabloids. No giraffe-based dimensions though.

    in reply to: Help in identifying galaxy in image #614703
    Nick James
    Participant

    Here’s a grotty image of the field from last night (Dec 15). It was quite hazy and my sky is very bright at the moment due to the blanket of now on the ground.

    in reply to: Help in identifying galaxy in image #614600
    Nick James
    Participant

    Aladin shows a faint galaxy at this position and the NASA/IPAC database lists two sources associated with it. The WISE source that Paul identified and a GALEXASC source (GALEXASC J062056.21+781041.4). Do you know when the background image in your message was taken?

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    in reply to: Christmas Meeting #614583
    Nick James
    Participant

    Jack, thanks for the pictures and David, thanks for the details. There are a few “Astronomer” pubs around the country. I wonder how many have rooms like this?

    in reply to: Christmas Meeting #614536
    Nick James
    Participant

    Yes, very enjoyable and great to see so many people at the meeting. Does anyone have any info on that Wray refractor at the pub?

    in reply to: Composite images #614509
    Nick James
    Participant

    Composites should always be marked as such so that it is clear that parts of the image have been processed separately and then recombined. People can then make a judgement about how “real” the image is. I wouldn’t say that a composite is a “fake” since, if done properly, it shows what would have been seen if the limitations of the telescope and camera had not been present. A good example is stacking a moving object, such as a comet, separately from the fixed stars. I agree though that this is open to abuse from people who are less than honest about how the image has been generated.

    in reply to: Mars Occultation #614408
    Nick James
    Participant

    And 3rd and 4th contact were 05:59:02 and 05:59:31 although the seeing by then was even worse.

    in reply to: Mars Occultation #614401
    Nick James
    Participant

    I got a good (electronic) view here in Chelmsford too. I’ve uploaded a full frame image of the Moon and Mars and a frame from the video:

    https://nickdjames.com/20221208_Mars_occultation/moon_20221208_0456_ndj.jpg
    https://britastro.org/observations/observation.php?id=20221208_051712_492f9d9303a0d800

    From my video I get first contact at 04:59:56 and 2nd at 05:00:29. The seeing was pretty poor though. Temperature at the moment is -2.8C.

    in reply to: Artemis #613611
    Nick James
    Participant

    Here we go again. Another attempt to launch SLS and Artemis-1. The launch window opens at 0604 UTC tomorrow (November 16) and if it goes at the start of the window we may get to see it on the first morning although the sky will probably be too light. After that, things are not so good. You can get an ephemeris from JPL Horizons if you want to have a go at observing it on the way to the Moon. There is an opportunity over the next few mornings as the spacecraft moves through Virgo, Libra and Scorpius.

    in reply to: Bob Evans #613608
    Nick James
    Participant

    That is really sad news. I met Bob at the TA AGM in 2006 September. At that meeting we had Tom Boles, Mark Armstrong, Maurice Gavin and Ron Arbour, all of whom had discovered supernovae using imaging. By that time Bob had discovered around 40 supernovae, all visually. Bob’s talk was excellent and should be around on video somewhere. I do remember him passing on greetings to those of us who lived “in the northern polar regions”. I don’t think he fancied observing from here!

    in reply to: Occultation of Uranus during lunar eclipse #613438
    Nick James
    Participant

    Fascinating.

    Following Alex’s link gets to a rather complicated map but, if I understand it correctly, the whole event is only visible during totality from Indochina. I’ve just checked using Stellarium and, indeed, they have a good view of this from Hanoi. The next time this happens is 2235 so I guess we are quite lucky!

    I wonder if we will see any pictures of it.

    Nick.

    in reply to: Asteroid timing accuracy #613344
    Nick James
    Participant

    You don’t need to wait for a fast moving NEO to pass by. I regularly check my timing accuracy by doing astrometry of GPS satellites as explained by Bill Gray here:

    https://projectpluto.com/gps_expl.htm

    • This reply was modified 3 years, 1 month ago by Nick James.
    in reply to: Partial solar eclipse of 2022 October 25 #613278
    Nick James
    Participant

    I’ve put a speeded up version of my eclipse video here:

    https://www.nickdjames.com/Eclipses/20221025/eclipse_20221025_ndj.mp4

    The entire eclipse in 35 seconds.

    Someone on Youtube yesterday said that watching a partial eclipse was like watching paint dry. As a public service this video is short enough that it should not stress the attention span of most social media users.

    in reply to: Partial solar eclipse of 2022 October 25 #613252
    Nick James
    Participant

    Clear here at the moment and the livestream is running. Under 30 mins to go.

    https://www.youtube.com/watch?v=1nUMDx8PiF4

    in reply to: Partial solar eclipse of 2022 October 25 #613223
    Nick James
    Participant

    My livestream on Tuesday morning will be here:

    https://youtu.be/1nUMDx8PiF4

    The forecast for Tuesday here is light cloud all morning so it may not be a very interesting livestream! At least it is not likely to be raining…

    in reply to: Lucy in the sky…. #613157
    Nick James
    Participant

    Much better conditions tonight but the spacecraft is now around mag 19.
    https://britastro.org/observations/observation.php?id=20221018_013758_7e01f580c6581403

    in reply to: Lucy in the sky…. #613125
    Nick James
    Participant

    A few tiny gaps between the rain clouds in Chelmsford. The fact that it is very close to the Moon doesn’t help but it is around 16.5 at the moment on the one out-of-focus image that I’ve managed to get.

    Here’s the badly out of focus image:
    https://britastro.org/observations/observation.php?id=20221017_033930_ce425b3fe9fb12a2

    • This reply was modified 3 years, 1 month ago by Nick James.
    in reply to: Lucy in the sky…. #613056
    Nick James
    Participant

    I got the spacecraft and Centaur upper stage a day after launch in 2021 October and so will certainly be having a go for this flyby. Closest Earth approach is 11:02 UTC on 2022 October 16 when it should be visible with the naked eye from Australia. Our best opportunity is the morning of October 17 when it will be in Gemini. It was mag 17 when I imaged it on the way out in 2021 and the SWRI web page below suggests it will be 12-16 the day after flyby then fading at around 2 mags/day.

    https://britastro.org/observations/observation.php?id=20211017_203152_36007e488544b44e
    http://lucy.swri.edu/SpotTheSpacecraft-EGA1.html

    in reply to: DART spacecraft impact with Dimorphos #613025
    Nick James
    Participant

    It is interesting that the velocity change is larger than would be expected and it appears that much of the momentum change came from ejecta rather than the spacecraft. That is something specific to rubble-pile objects I guess. A solid object would produce far less ejecta.

Viewing 20 posts - 281 through 300 (of 994 total)