Sun Eats Comet

Back on Oct 1, 2024, I posted that the ATLAS survey in Hawaii had discovered another new comet that would become bright in Earth’s skies. Predictions for C/2024 S1 (ATLAS) had it reaching as bright as magnitude -5 to -7 when it comes closest to the sun, at perihelion, on October 28. But now it appears likely that the Sun has devoured this latest interloper. The latest imagery from the sun-observing SOHO spacecraft suggests that Comet S1 did not survive its run-in with the sun. On its approach to today’s perihelion, the once-promising sungrazer comet seems to vanish from the spacecraft’s field of view. Presumably, the comet has disintegrated.

Complete article can be found at EarthSky

More of Comet Tsuchinshan-ATLAS

I'm still processing the camera shots of comet Tsuchinshan-ATLAS that I took on Thursday from the church property in Westminster, but yesterday I noticed that the comet was high enough in the sky now to be visible from my home above the trees. So, I imaged it with my wide field ZS61 telescope and ASI533 camera. Later this coming week I'll image it with my EdgeHD11 to get real close and hopefully some more fine detail in the tail(s).

Comet Tsuchinshan-ATLAS - October 18, 2024 - 7:30pm EDT
ZS61/ASI533mc - 17x60sec

New Photos of Comet A3

Skies cleared wonderfully this evening, so I set up my camera at my church property and snapped away! 

Here are the first images to be processed, I'll get to the rest later this week.

Image one is a stacked composite using Astro Pixel Processor to register and stack the comet and PSP to enhance the image. The anti-tail is plainly visible.

Comet A3 - October 15, 2024 7:28 pm EDT
Canon 70D - 22 stacked subs
70mm, ISO 400, f/5 5sec per sub 

Image two is a single photo, taken at the end of my session at 18mm, processed in PSP to enhance the image.

Comet A3 - October 15, 2024 - 7:59 pm EDT
Canon 70D - f/4, ISO3200, 18mm, 5 sec

Comet Tsuchinshan-Atlas has an anti-tail!

Comet A3 has an anti-tail! Can you see it?

What's so special about an anti-tail? Well ... ordinary comet tails always point away from the sun. That's because they're created by solar radiation pressure and by solar wind streaming out from our star. But – as of Sunday – Comet A3 also has a rare anti-tail pointing toward the sun. An anti-tail appears as Earth crosses the comet’s orbital plane, as it has been since Sunday and will be through this evening. A discussion of A3's rare anti-tail can be found at EarthSky.

Here are a few photos of A3 with it's anti-tail. I was actually able to capture it in my photos from Monday (see Sky and Rockets: Additional Processing of Tsuchinshan-Atlas) but these are really excellent.

Yarelis Medina caught the anti-tail of Comet A3
on October 13, 2024, from Utuado, Puerto Rico.

By Anis Abdul
Pontotoc, TX, USA, Pontotoc, TX, United States
AstroBin

Soldiers Delight Star Party this Saturday

“Unlocking the Cosmic Secrets: The James Webb Space Telescope”

Join us on a captivating journey beyond the visible spectrum! The JWST, humanity’s latest cosmic sentinel, is poised to revolutionize our understanding of the universe. Imagine peering through the veil of dust and time, witnessing the birth of galaxies, the dance of exoplanets, and the cosmic symphony of star formation. In this exclusive talk, we’ll delve into the cutting-edge science, awe-inspiring innovations, and mind-boggling discoveries that await us. Buckle up, stargazers—Webb has already challenged our understanding of the Universe and is continuing to unveil the cosmos as never before!

All programs are Rain or Shine. Time machines will be provided by the Westminster Astronomy Club.

Date: Saturday, October 19, 2024

Time: 8 p.m. - 11 p.m. Eastern

Location:

Soldiers Delight Environmental Area
5100 Deer Park Rd.
Owings Mills, MD 21117

Additional Processing of Tsuchinshan-Atlas

Spent some time stacking 14 individual 10sec images to get a cleaner, slightly more detailed image of the comet.

First sighting of Comet Tsuchinshan-Atlas

Tonight was the first evening that I expected comet Tsuchinshan-Atlas to be visible, possibly with the naked eye, but certainly in binoculars. Originally, I was going to view it at my church in Westminster, but the overlook on Deer Park road, just west of the Soldiers Delight Visitor Center (where I give lectures every third Saturday evening) was just a couple of minutes from where I live and has a nice parking area facing west.

I arrived at 6:00PM and there was already about 10 or so folks gathering to photograph the comet. Had a great time talking with everyone while waiting for the sky to darken a bit and the comet to show. Some rather thick clouds were obscuring the western horizon, but as soon as it got reasonably dark Tsuchinshan-Atlas made it's appearance. It appeared to be quite dim, but that could have been due to the cirrus and cirrostratus clouds covering the area. Fairly easy to spot with binoculars - tail extending about 10 degrees nearly straight up.

Comet Tsuchinshan-Atlas - October 13, 2024 - 7:41PM EDT
Canon 70D - 32mm f/4 ISO 800 10sec
Processed in Paint Shop Pro

Weather prospects are still fairly good for the next few evenings, and with the comet rising a bit each day it should be easier to pick out. I'll be imaging it every night, weather permitting.

Aurora Here In Reisterstown

Although I try to announce when astronomical events will happen reasonably in advance of the event auroras are hard to anticipate and predict. Partially because I've never seen one myself and it is very rare to see them at all this far south (they are a northern sky event, hence the popular name "Northern Lights".

However, I was ready to post about the likelihood of seeing the aurora after 10:00pm tonight when I get a Facebook notification from my astronomy club (WASI) that the event is happening NOW (that was at about 7:00 - 7:30 pm). It is still possible to see it throughout the evening, but the major portion may have already gone by.

Here are a few pics from my iPhone taken from my front yard in Reisterstown, MD.

Comet Tsuchinshan-Atlas visible soon!

Comet Tsuchinshan-Atlas (C/2023 A3) should be bright enough to see with the naked eye very soon! The comet will be closest to Earth this Saturday but should be visible through the end of October given that there are clear skies. It will get dimmer as it climbs higher in the western sky so if you want to see it without optical aid early in the month would be preferable. It will still be low in the sky so seek out a good location that won't have trees or buildings in the way.

To get the best view of the comet, go outside about an hour after sunset and look west. While you should be able to see the comet with the naked eye given clear skies, binoculars and telescopes will give you a better view of it. 

Here is a chart showing the location of the comet through October.

Two comets coming soon ... yes, two!

Comet 'no-name' - a bright sungrazer?

Ok, if you've been keeping up with the astronomy news of the last few weeks you already know about comet C/2023 A3 (Tsuchinshan-ATLAS) (see my post of Aug 31). In mid-October it should be well placed in the western sky just after sunset for those of us in the northern hemisphere and rising higher every day afterward. Reports from folks down in NZ and Aus have indicated that it has survived the perihelion passage (Sept 27) and is putting on a great show. I'll be posting an update later this week.

Tsuchinshan-ATLAS - photo by Ian Griffin
Mount John - Lake Tekapo South Island NZ 

But the exciting news is that the ATLAS survey in Hawaii has discovered another new comet (September 27, 2024) that could become bright in Earth’s skies. This comet is so new it’s still waiting for its name (current designation is A11bP7I). Predictions for the comet have it reaching as bright as magnitude -5 to -7 when it comes closest to the sun, at perihelion, on October 28. That would make the comet even brighter than the brightest planet, Venus. It might even be visible in the daytime sky. As with Tsuchinshan-ATLAS, this comet will first make its appearance in the southern hemisphere before making its debut in the north during the early morning hours in late October and early November. A11bP7I is part of the Kreutz sungrazers. These are comets that come perilously close to the sun, where they can disintegrate or, if we’re lucky, become fantastically bright. We'll see.