开云体育

My estimate of the dynamical age is based on the (inbound) semi-major axis, which is ~4000 au for this comet. Comets with such a semi-major axis of a few thousand au can often become gravitationally

Hi Qicheng, hi all, i am curious about which information can tell that the comat has "a dynamical age on the order of only ~1 orbit" ? I thought the orbit analysis could only tell the previous

Denis, Jakub, Bob, friends, As told previously, I am tired after three consecutive nights ( Dec. 26, 27, 28 ) observing comets from the snowy Cantabrian Mountains. So this will be a short reply ...

Denis, Hoping for clear skies soon. I'll report back. Thanks, Bob <buczynski8166@...> wrote:

Bob, It will be intersting to see your report when you are able to observe then comet. JJ was observing from a high altitude mountain site and it exceptional that he has been able to observe this

Peter, That was absolutely brilliant. What a great sleuthing method! Bob [email protected]> wrote:

Jakub and all, This discussion has inspired me to observe C/2023 Q1 in my 38-cm reflector at the next opportunity. I also have a very dark sky especially in the north direction — when the aurora

Hi Bill, This occasionally happens with Astrometrica, often occurring when an image is included in a stack by mistake with e.g. a bright artificial satellite crossing the field, throwing the software

On 12/29/24 10:39, Peter Birtwhistle via groups.io wrote:> I think the stacking may have registered a frame incorrectly causing a Interesting. I wonder how often such things happen? Often enough that

Hello all, If I have read the posts correctly, we have two observations: 1. CCD magnitude of 14.1 mag with a 5' aperture. 2. Visual magnitude of 11.6 mag with a 6' aperture. How can we explain such a

Hi again JJ. Thanks for your reply, always courteous and friendy. Some of what you write I agree with, some aspects are more contentious. However you previously mentioned you had spoken you last words

Denis, You deserve a good reply ... - Quoting your words : " My imaging may not have not recorded a very faint outer coma , but in the overall description of the condition of this comet I would say

Hi all, Last night I observed again from Frasso Sabino (Observatory 157, Rieti, Italy) the "comet" 2015CD60 and it has not only increased in brightness, compared to December 2nd when I realized it was

Anecdotally, I once created a comet on Tri-X film back in the late 60's. I was wearing a radium-dial watch in the dark room. :-) Kinda exciting for a minute or two. [email protected]> wrote:

Have you checked to see if you may have imaged a venting from a spacecraft or rocket body??RegardsThomas

Hi Peter, Thank you so much, that’s very interesting; I had no idea that could happen. It was the first image I took with the Seestar and, being new to stacking procedures, I let it proceed without

John, I think the stacking may have registered a frame incorrectly causing a faint image of the centre of M15 to appear offset to the west. I've blinked the B-27 image with the Dec 20 image and there

Hello all, I'm a new member, MPC recommended your group. I live near the North York Moors National Dark Skies Park, northeast UK, and recently bought a Seestar S50 to help them with outreach. To

On 12/29/24 04:33, Maik Meyer wrote:> You may use With the minor note that, because this is a spacecraft-based observation, you'll have to tell MPC where the spacecraft was at the time of the

Hi JJ, I used the word debate in the context that the apparent magnitude of this comet is in debate, not your method of observing or derived results. I do not want to have an argument about this.I