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Old 01-03-2023, 02:14 PM
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C/2023 A3 (Tsuchinshan-ATLAS) (Previously A10SVYR) announced.

Hi All,

New **potentially** naked eye comet for 2024 announced.

M.P.E.C. 2023-D77 issued 28th February 2023 announces the discovery and designation of a new cometary object: C/2023 A3 (Tsuchinshan-ATLAS) (Previously designated A10SVYR).

The first part of the name apparently derives from Mandarin and translates roughly to "purple mountain".

The current provisional orbital elements are contained in the MPEC.
C/2023 A3 (Tsuchinshan-ATLAS)
Epoch 2023 Feb. 25.0 TT = JDT 2460000.5
T 2024 Sept. 28.55963 TT Rudenko
q 0.3904059 (2000.0) P Q
z +0.0006401 Peri. 308.59081 +0.36275685 +0.90020587
+/-0.0030246 Node 21.58224 +0.91805884 -0.30086181
e 0.9997501 Incl. 139.08539 -0.15992321 +0.31481988
Here is a recent portrait by Rolando Ligustri Chile, ITelescope, Taka 180ED f2,8 ccd ASI2600MM L=5x180sec at 08:30 TU field of 15'x15'.


Comment: This is *potentially* a naked-eye comet and **possibly** even a bright naked eye comet that reaches perihelion on 28th September 2024. Given that the new comet is currently at magnitude +17.5 but is about half-way between Jupiter and Saturn, it is *possibly* a large cometary object and the perihelion distance is around the Mercury-Sun distance (0.39 AU). It is presently in Serpens not far from the bright globular cluster Messier 5.

There remains a possibility the current magnitude is inflated by it being presently in some sort of outburst, but this seems unlikely given how far it is from the sun at present. It is therefore quite possibly a relatively large (physically) cometary object whcih increases the chance of it becoming genuinely bright.

I don't want to get too over the top about this because comets have a way of defying everybody's expectations. This comet has the potential to become quite bright (ie visible naked-eye) and potentially a very bright object in the pre-dawn pre-perihelion sky and then for southern observers, for a number of days in the evening sky post-perihelion. The comet passes almost exactly between Earth and Sun in early October 2024 (at a very, very comfortable ~75 million km distance-- no chance of collision) so the back-scattering effect is likely to be very high **potentially** heightening the visibility of any tail.

As all astronomers well know, comets often have a way of disappointing or failing in their promise (or even disintegrating). But at this point in time, this one shows a lot of promise.

We can't really speculate further about this, that or the other because anything further would be almost pure speculation, This object has the potential to be a bright naked-eye comet, end of story at the moment.

Additional cynical comment: The English translation of the name will undoubtedly be seized on by the mainstream media and this will become the "Purple Mountain Comet" -- you watch.

Best,

L.
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Old 01-03-2023, 02:19 PM
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https://catalina.lpl.arizona.edu/css...&Cz=769&CZ=143
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Old 01-03-2023, 02:28 PM
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gaseous (Patrick)
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Thanks Les, I get the impression you've been emotionally scarred/let down by comets in the past! It would be nice to get a decent naked eye comet in the southern hemisphere.
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Old 01-03-2023, 03:11 PM
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Hi Pat,

Quote:
Originally Posted by gaseous View Post
Thanks Les, I get the impression you've been emotionally scarred/let down by comets in the past! It would be nice to get a decent naked eye comet in the southern hemisphere.
Hmmm ... no but as a long-time amateur and also being formerly part of the media, I am sick to death of the hyperventilation one sees in the MSM every time a promising comet rolls around and it is instantly dubbed the "Comet of the Century" etc etc.

Instance one: C/1973 E1 Kohoutek that was such an incredible fizzer. When the media hypes these things up on a slow news day the public (and the interwebs) are whipped into a clicking frenzy and if it becomes a fizzer, the public blame the astronomers, not the media -- then next time don't listen.

Three years after Kohoutek C/1975 V1 (West) turned up. Nobody listened to the astronomers and the public missed the best comet in a decade or so.

There have been a dozen others in between then and now. Hyakutake, Hale-Bopp and McNaught were all very bright comets that most of the public missed -- because they weren't listening to the astronomers and for some reason the media didn't pick up on them. The recent 2022 ZTF was hyped to billy-oh on a few slow news days and while it was a "nice comet" it was a complete let-down for the public because it was over-hyped.

The caveats are important at the moment. The orbit looks pretty well nailed-down but beyond that a lot of things are governed by variables we can't estimate very well at this point in time.

Suffice to say, this is a very promising looking prospect -- no guarantees.


Best,

L.
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Old 07-03-2023, 01:07 AM
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Hi All,

What are the real experts thinking regarding this comet at this (very early) point?

https://groups.io/g/comets-ml/topic/97308197#31299

Some very, very experienced comet observers comment here regarding the future prospects for C/2023 A3. Measure of hope mixed with many sensible tinges of caution.

Best,

L.
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Old 07-03-2023, 12:23 PM
Saturnine (Jeff)
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Quote:
Originally Posted by ngcles View Post
Hi All,

What are the real experts thinking regarding this comet at this (very early) point?

https://groups.io/g/comets-ml/topic/97308197#31299

Some very, very experienced comet observers comment here regarding the future prospects for C/2023 A3. Measure of hope mixed with many sensible tinges of caution.

Best,

L.
The waiting until next October 2024 is going to be the hard part, though we should have better data and predictions months before perihelion. That we may have an apparition something similar to Hale -Bopp or McNaught is something to look forward to . Thanks for the original post Les.

Last edited by Saturnine; 07-03-2023 at 12:24 PM. Reason: add text
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Old 11-03-2023, 02:56 PM
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Hi All,

A sensible, well-balanced and realistic summation of what might and/or might not occur regarding C/2023 A3 (Tsuchinshan–ATLAS). The up-shot is: We won't know how bright this comet will become with any precision until about this time next year. Looking good to reach naked-eye visibility, beyond that is a bit of a guessing-game.

https://www.space.com/comet-coming-2024-could-be-bright

The caveats expressed early in the article regarding C/1973 E1 Kohoutek are relevant and valid. I remember (with some chagrin) the ultra-hype associated with that comet that turned out to be the under-performer of the century as opposed to the comet of the century.

That said, there's a lot about the orbital characteristics and geometry of C/2023 A3 (Tsuchinshan–ATLAS) that bears similarity to C/1956 R1 (Arend–Roland) (before my time) -- that turned out to be a conspicuous and interesting comet with a long tail and somewhat of an anti-tail.

Fingers crossed -- look forward hopefully. Wait and watch!

Best,

L.
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Old 14-03-2023, 09:13 PM
EpickCrom (Joe)
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Hi Les, thanks for your posts on this new comet.

I hope and pray that it will be a Great Comet with a blazing long tail and bright coma visible even from light polluted skies!!

Clear skies
Joe
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