|
Re: Comet C/2025 F2 (SWAN) > 2025.04.20
Sorry, but the photos posted in the list are rescaled to a maximum of
1024 pixels? I tried with the last image (1920 pixels) and it was reduced to 1024pixels Il giorno dom 20 apr 2025 alle ore 09:37 Danilo Pivato via groups.io <BigBangObservatory@...> ha scritto:
|
|
Re: Is comet c/2025 f2 SWAN disintegrating?
Comet C/2025 F2 (SWAN) continues to fade slowly, on the morning of 2025 April 18 UT the comet was magnitude G=9.8 as calculated from 5x20 second images thru a green filter in an aperture diameter of 3'. The comet coma was 2.5' wide and the comet had a fan tail 2' long at a position angle of 309 degrees from the comet coma. There is a lot of speculation about the comet disintegrating, so put together some 4.3'x4.6' FOV images of the comet to maybe help with that conversation, although using a small scope at low altitude with a 75% illuminated Moon is not ideal to see much fragmentation.? |
|
Re: Comet C/2025 F2 (SWAN) in the bright Moonlight
Comet C/2025 F2 (SWAN) continues to fade slowly, on the morning of 2025 April 18 UT the comet was magnitude G=9.8 as calculated from 5x20 second images thru a green filter in an aperture diameter of 3'. The comet coma was 2.5' wide and the comet had a fan tail 2' long at a position angle of 309 degrees from the comet coma. There is a lot of speculation about the comet disintegrating, so put together some 4.3'x4.6' FOV images of the comet to maybe help with that conversation, although using a small scope at low altitude with a 75% illuminated Moon is not ideal to see much fragmentation.? |
|
Re: Comet C/2025 F2 (SWAN) in the bright Moonlight
On the morning of 2025 April 17 UT the only tail visible of Comet C/2025 F2 (SWAN) in images taken with the small 50mm f/5 refractor was a short fan tail above the comet's coma in these images. The comet was magnitude 9.6 as calculated from 5x20 second images thru a green filter in an aperture diameter of 3.5'. If the comet has now settled into its normal magnitude curve (the comet has been around magnitude 9-9.5 for the past 9 mornings) after some major eruptions when first discovered, what does that say about its peak brightness at perihelion which is only 2 weeks from now assuming there are no more major eruptions? |
|
Re: Is comet c/2025 f2 SWAN disintegrating?
Observed the following mornings from April 15, 16 and 17 UT. On April 15 the tail was very easy to observe, but on April 16 the tail basically disappeared with just a little fan tail above the coma in these images. The April 17 observations verified the nice tail is currently gone at least as observed by a 50mm f/5 refractor. The comet faded a little from April 15 to 17. |
|
Re: Is comet c/2025 f2 SWAN disintegrating?
开云体育Yes, yesterday morning it was stark. Elongated coma; hardly any tail. Even in consideration of a relatively bright moon in the sky, it was obvious.
|
|
Re: Is comet c/2025 f2 SWAN disintegrating?
Hi all,
This morning i decided to do my last morning attempt to observe comet f2 SWAN but, surprisely, i found nothing despite the clear sky. Later i found on internet some very recently photos of f2 SWAN and it appear to have lost his ion tail and its coma is now elongated and much more dimmer than some days ago. Those unusual peculiarities can also be seen on the two last photos that Mike Olason have posted on his topic. Now I’m pretty sure that this object is clearly disintegrating and it will disappear totally before perihelion. A bit disappointing, but that’s it. Can someone confirm mine and Olason recent observations?
Cheers, Erik
? |
|
Re: Comet C/2025 F2 (SWAN) in the bright Moonlight
Using the same equipment and setup as yesterday morning, my stuff could not see any sign of the long tail of Comet C/2025 F2 (SWAN) observed yesterday morning although I am sure that it must be there, just a lot fainter. On the morning of 2025 April 16 C/2025 F2 had faded some from yesterday morning with a magnitude 9.6 as calculated from 6x20s images thru a green filter in an aperture diameter of 3.5'. I don't think the Moon made any difference since it was about the same illumination as yesterday morning and in the southwest sky. Both mornings the sky appeared perfectly clear. |
|
Comet C/2025 F2 (SWAN) in the bright Moonlight
The Moon was 94% illuminated on the morning of 2025 April 15 UT, Comet C/2025 F2 (SWAN) was magnitude G=9.4 as calculated from 6x20 second images thru a green filter in an aperture diameter of 3.5'. The coma was 3' wide, the wavy tail in the image FOV was 53' long at a position angle of 309 degrees from the coma. The comet has been quiet the past week, with a brightness staying around magnitude 8.9 to magnitude 9.4, but the comet certainly does have a nice thin wavy tail that extends about twice as long as shown in this set of images. |
Danilo Pivato
Mike Olason
Dan Bartlett
Erik
