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Demise of a Comet: S1 Did not Survive its Sungrazing Plummet

October 30, 2024
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Demise of a Comet: S1 Did not Survive its Sungrazing Plummet
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Sungrazer C/2024 S1 ATLAS broke aside at perihelion.

Alas, a ‘Nice Halloween Comet’ was to not be. The Universe teased us only a bit this month, with the potential promise of a second bare eye comet in October: C/2024 S1 ATLAS. Found on the evening of September twenty seventh by the Asteroid Terrestrial Final-alert affect System (ATLAS) all-sky survey, this inbound comet was surprisingly vivid and energetic for its relative distance from the Solar on the time of discovery. This gave the comet the potential to do what few sungrazers have completed: survive a blisteringly shut perihelion passage close to the Solar.

S1 ATLAS ends
S1 ATLAS on remaining photo voltaic method. NASA/ESA/SOHO

Perishing at Perihelion

However as perihelion day approached yesterday on October 28th, issues began to look grim. S1 ATLAS started to resemble a backyard selection Kreutz sungrazer increasingly. Little greater than an icy rumble pile on remaining method, the comet went within the interior area of view of the Photo voltaic Heliospheric Observatory’s (SOHO) LASCO C2 imager and behind the central occulting disk yesterday morning… and didn’t exit.

LASCO C2
Comet S1 ATLAS ends its days, as seen through SOHO’s LASCO C2 imager. NASA/SOHO

Perihelion distance (and time of expiry) for the comet was 330,600 miles/532,000 kilometers from the floor of the Solar yesterday, at round 7:30 AM EDT/11:30 Common Time. Curiously, the ultimate estimates for the comet put its orbital interval at 953 years, suggesting that this will likely not have been its first passage by means of the interior photo voltaic system.

Finale
The finale for Comet S1 ATLAS, simply hours previous to perihelion. ESA/NASA/SOHO/NRL

The comet gave us just a few tell-tale indicators that it was under-performing main as much as perihelion. After a short outburst round its discovery 1.094 Astronomical Items (AU) from the Solar, the comet then pale significantly in early October. The lackluster efficiency was confirmed because it entered the sphere of view of SOHO’s LASCO C3 viewer this weekend. Nonetheless, its remaining photo voltaic dive placed on a superb present.

As I’m certain you’re conscious, little comet ATLAS didn’t make it. ? It was clearly already a pile of rubble by the point it reached the LASCO area of view, and photo voltaic radiation took care of the clean-up for us. ???? pic.twitter.com/s8HrchtWnF

— Karl Battams (@SungrazerComets) October 28, 2024

A Temporary Historical past of Sungrazers

The demise of Comet S1 ATLAS yesterday delivered to thoughts reminiscences from early on in my Universe At this time writing profession of one other nice comet that wasn’t: C/2012 S1 ISON. That specific comet met its finish on U.S. Thanksgiving Day 2013. The final nice shock for sungrazers was Comet W3 Lovejoy in 2011-2012, which survived a perihelion simply 87,000 miles/140,000 kilometers from the floor of the Solar (!), and went on to develop into a fantastic comet. One other instance displaying us what is feasible was Comet Ikeya-Seki, which survived perihelion 280,000 miles/450,000 miles from the Solar in 1965 and have become one of many nice comets of the 20th century.

Comet
Gentle curve magnitude comparisons of comets Ikeya-Seki, W3 Lovejoy and S1 ATLAS within the lead as much as their respective perihelia. Credit score: Jakub Cerný

Astronomer Heinrich Kreutz found the existence on the Kreutz family of sungrazing comets within the Nineties. The earliest documented report of a sungrazer was from Greece by Aristotle and up to date historian Ephorus in 371 BC. Previous to 1979, solely 9 confirmed sungrazers had been recognized of… the launch of the joint NASA European House Company’s SOHO mission in 1995 modified the sport significantly. Now, SOHO’s sungrazer tally after over 1 / 4 of a century in house is 5,065 comets and counting. It seems, we had been nonetheless lacking numerous what was passing by means of the interior photo voltaic system, all this time.

Extra in Retailer?

Final week, the NOAA revealed the successor for SOHO’s coronagraph aboard its GOES-19 satellite tv for pc. The CCOR-1 (Compact Coronagraph) ought to begin releasing public photographs in early 2025.

This comes because the ‘different’ October comet, C/2023 A3 Tsuchinshan-ATLAS fades from view. A3 T-ATLAS is now outbound at +6th magnitude within the constellation Ophiuchus. The comet had a good night apparition put up perihelion just a few weeks in the past. The spiky ‘anti-tail’ offered an incredible view.

Are there any nice comets on faucet for 2025? Effectively, as of penning this, there’s just one comet with actual potential to achieve bare eye visibility in 2025: Comet C/2024 G3 ATLAS. This comet reaches perihelion 0.094 AU from the Solar on January 13th. G3 ATLAS and ‘could’ prime -1st magnitude or brighter.

S1 ATLAS could have joined the ranks of comets that didn’t stay as much as expectations… however you simply by no means know. Its fast-paced story from discovery to demise exhibits us simply how shortly the following vivid comet may make itself recognized. Hold watching the skies: its solely a matter of time.

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