Comet C/2023 A3 (Tsuchinshan - ATLAS) was discovered on February 22, 2023 by the ATLAS (Asteroid Terrestrial-Impact Last Alert System) surveillance program in Sutherland, South Africa using the 0.5 m Smith telescope. In was later discovered that the Purple Mountain Observatory in Nanjing, China reported the object on January 9, 2023 but it was not confirmed. Based on its orbit, it is a new comet from the Oort Cloud. It will reach perihelion on September 27, 2024, a minimum distance of 0.39 AU away from the Sun, located between the orbits of Venus and Mercury. Closest approach to Earth is on October 12, 2024, 0.47 AU away from our planet. It is believed that the comet will rise to magnitude -1, but it will not be visible from Earth at that time.
Comet 12P/Pons-Brooks
Comet 12P/Pons-Brooks is a periodic comet that visits the inner solar system every 71 years. The comet was first discovered by Jean-Louis Pons on July 12, 1812. On its next return to the inner solar system, the comet was recovered by William Robert Brooks in 1883. The comet's periodic visits were not yet established but eventually it became known was 12P/Pons-Brooks.
On April 21, 2024, the comet reached perihelion, and closest approach to Earth occurred on June 2, 2024 when the comet was on its way back to the outer solar system. On April 8, 2024, during the total solar eclipse, the comet was 24 degrees East of the Sun and the Moon, near the planet Jupiter.
Recent Comet Brightness Estimates - reported to the Minor Planet Center at Harvard. Check here to see what comet observations have been made and submitted to the Center. Magnitude estimates are made by the astronomers and are subjective unless otherwise stated.
Rosetta Mission - Comet Exploration Mission (Mars Swing by Feb. 25, 2007.) Arrived at comet 67P/Churyumov-Gerasimenko on November 12, 2016. It deployed its probe, Philae, to the surface of the comet. Rosetta followed the periodic comet through perihelion on Aug. 13, 2015. On Sept. 30, 2016, the Rosetta spacecraft performed a controlled crash on 67P/Churyumov-Gerasimenko to end its mission.
Comet P1 Nishimura was discovered by a Japanese amateur astronomer, Hideo Nishimura. This is the third comet that bears his name! He also discovered C/1994 N1 (Nakamura-Nishimura-Machholz) and C/2021 O1 (Nishimura). He also discovered a nova, V6596 Sagittari. Mr. Nishimura discovered the comet in images he obtained with a Canon EOS 6D camera using 200-mm f/3 telephoto lens. He initially identified the comet on August 12, 2023, but found that he had also taken its image the previous night.
Comet Nishimura is now known to be a periodic comet (hence the "P" in its name.) Its last visit to the inner solar system was 433 years ago. The comet also showed up in the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) data in January 2023, but was not identified before Nishimura's discovery.It has been noted that the Nishimura comet may be the cause of the Sigma-Hydrid meteor shower that occurs annually in December.
This image of C/2023 P1 (Nishimura) was downloaded from Creative Commons. It was taken on August 25, 2023 at ~6:20 (UTC+2)from Trevinca-Skies on Spain. The field of view is 43.2' x 43.2'.
C/2023 P1 (Nishimura)
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C/2022 E3 (ZTF) - It is a long period comet that was discovered by the Zwicky Transient Facility on March 2, 2022. Perihelion occured on January 12, 2023 but its closest approach to Earth (0.29 AU or 42 million km) came on the outbound leg of E3's visit on February 1. This comet returns to the inner solar system every 50,000 years. The coma is very green and the tail wass quite long. The image featured here was taken by Lorenzo Busilacchi using a C-11 telescope and retreived from Flickr on January 17, 2023.
The green coma of C/2022 E3 (ZTF) is caused by the breaking down of diatom carbons. Anton explains in depth and very well.
C/2022 E3 (ZTF)
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Comet NEOWISE
For many astronomers, predicting whether or not a comet will be very bright is a tough challenge. In 2020, Comet C/2020 F3 took astronomers by surprise when it brightened up tremendously after its perihelion visit to the Sun. This sleeper was discovered on March 27, 2020 by the NEOWISE space telescope.
The comet was a 16-mag object when discovered. It was 2.1 au from the Sun at that time. It brightened quickly and reached 10th magnitude by the end of April. Perihelion was on July 3 and it will be 0.69 au at its closest approach to Earth around July 22.
For more information, check out the What's Up Almanac topic for July 2020.
C/2020 F3 (NEOWISE) at 2:35 UT from Oria, Italy
Credit: Giuseppe Donatiello
The image below was created by Tom Ruen and licensed under
CC BY-SA 4.0 and can be found on Wikipedia for more information. The bright yellow line in the diagram represents the ecliptic.
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Comet Lovejoy (C/2014 Q2)
At last, an exciting comet that wasn't overbilled in the media. This comet was the fifth comet discovered by comet hunter Terry Lovejoy. Using CCD camera images taken with a Celestron C-8 telescope, Lovejoy found this comet from Queensland, Australia on August 17, 2014. A long period comet, the perihelion date for Comet Lovejoy was January 30, 2015. Closest approach to Earth was January 7 when it was 43.6 million miles or 70.2 million km away from us. It reached 4th magnitude within the limits for observing with the unaided eye.
Comet C/2012 S1 (ISON) was sun grazing comet was discovered on September 21, 2012 by Artyom Novichonok and Vitali Nevski, using a 16-inch telescope that is part of the International Scientific Optical Network (ISON). It was nicknamed the Holiday comet because its perihelion date was November 28, Thanksgiving Day in the U.S. Despite high expectations, this comet broke apart due to its close encounter with the Sun. After a long life of 4.5 billion years, ISON was destroyed at perihelion.
The brightest comet of the new millennium so far! C/2006 P1 a.k.a. Comet McNaught. Discovered by Robert McNaught of the Siding Spring Observatory in Australia on August 7, 2006. Perihelion was January 12, 2007. Peak magnitude estimate -0.6! This comet will be long remembered for its magnificent tail.
So long, Comet McNaught, it won't be back to visit the inner solar system again.
In 1995, Comet 73P/Schwassmann-Wachmann 3 split into "mini-comets" flying single file through space, much like Shoemaker/Levy9 that crashed into Jupiter. Closest approach to Earth: 5 million miles on May 15, 2006.
OR crash into planets....OR break up into pieces....OR hit the sun...Or are flung out of the solar system never to return This false-color image of Hyakutake was made on the WIYN Telescope. Courtesy of the WIYN Consortium, Inc.
Beam me back, Astra