Comet Ikeya–Seki, formally designated C/1965 S1, 1965 VIII, and 1965f, was a long-period comet discovered independently by Kaoru Ikeya and Tsutomu Seki. First observed as a faint telescopic object on 18 September 1965, the first calculations of its orbit suggested that on October 21, it would pass just 450,000 km (280,000 mi) above the Sun's surface, and would probably become extremely bright.
13P/Olbers is a periodic comet with an orbital period of 69 years. It fits the classical definition of a Halley-type comet with a period between 20 and 200 years. The comet last passed perihelion 30 June 2024 and it was previously seen in 1956. The next perihelion is in 2094.
Comet Holmes is a periodic comet in the Solar System, discovered by the British amateur astronomer Edwin Holmes on November 6, 1892. Although normally a very faint object, Holmes became notable during its October 2007 return when it temporarily brightened by a factor of a million, in what was the largest known outburst by a comet, and became visible to the naked eye. It also briefly became the largest object in the Solar System, as its coma expanded to a diameter greater than that of the Sun. Between 1857–2106 perihelion remains between 2.05–2.36 AU.
23P/Brorsen–Metcalf is a periodic comet with an orbital period of 70 years. It fits the classical definition of a Halley-type comet with. It was first discovered by Theodor Brorsen at the Altona Observatory on July 20, 1847, and again by Kaspar Schweizer (Moscow) on August 11, 1847. It was predicted that it would reappear between 1919 and 1922.
Comet Lulin, formal designation C/2007 N3, Traditional Chinese:鹿林彗星) is a non-periodic comet. It was discovered by Ye Quanzhi and Lin Chi-Sheng from Lulin Observatory. It peaked in brightness at magnitude between +4.5 and +5, becoming visible to the naked eye, and arrived at perigee for observers on Earth on February 24, 2009, and at 0.411 AU from Earth.
Ryves's Comet, also known as C/1931 P1, 1931 IV or 1931c, was discovered by Percy Mayow Ryves, an English amateur astronomer, on 10 August 1931. The comet passed perihelion on 25 August 1931 at a distance of 0.075 AU from the Sun.
C/1989 X1 (Austin) was a comet discovered by New Zealand amateur Rodney R. D. Austin on December 6, 1989. The comet at discovery was predicted to become easily visible by naked eye in spring 1990, however it failed to become that bright.
C/1807 R1, also known as the Great Comet of 1807, is a long-period comet. It was visible to naked-eye observers in the northern hemisphere from early September 1807 to late December, and is ranked among the great comets due to its exceptional brightness.
C/2022 E3 (ZTF) is a non-periodic comet from the Oort cloud that was discovered by the Zwicky Transient Facility (ZTF) on 2 March 2022. The comet has a bright green glow around its nucleus, due to the effect of sunlight on diatomic carbon and cyanogen. The comet's systematic designation starts with C to indicate that it is not a periodic comet, and "2022 E3" means that it was the third comet to be discovered in the first half of March 2022.
C/2023 A3 (Tsuchinshan–ATLAS) is a comet from the Oort cloud discovered by the Purple Mountain Observatory in China on 9 January 2023 and independently found by ATLAS South Africa on 22 February 2023. The comet passed perihelion at a distance of 0.39 AU on 27 September 2024, when it became visible to the naked eye. Tsuchinshan-ATLAS peaked its brightest magnitude on 9 October, shortly after passing the Sun, with a magnitude of −4.9 per reported observations at the Comet Observation Database (COBS).
C/1962 C1 (Seki–Lines), also known as Comet Seki–Lines and 1962c, was a hyperbolic comet discovered independently by Richard D. Lines and Tsutomu Seki on 4 February 1962. The comet became vry bright in April 1962, as passed its perihelion on 1 April at a distance of 0.031 AU.
C/2023 P1 (Nishimura) is a long-period comet discovered by Hideo Nishimura on 12 August 2023. The comet passed perihelion on 17 September 2023 and reached an apparent magnitude of about 2.5.
C/2024 G3 (ATLAS) is a long-period, sungrazing comet, which will reach perihelion on 13 January 2025, at a distance of 0.09 AU from the Sun. It could become the brightest comet of 2025, possibly exceeding apparent magnitude of −3.5. The comet is visible in the southern hemisphere before and after perihelion. It can only be observed in the daytime sky around perihelion in the northern hemisphere.
Comet Tago–Sato–Kosaka, formally designated as C/1969 T1, is a non-periodic comet that became visible in the naked eye between late 1969 and early 1970. It was the first comet ever observed by an artificial satellite.
C/1939 H1 (Jurlof–Achmarof–Hassel) is a long-period comet discovered on 15 April 1939. The comet was discovered by many observers independently but the first reports were those of Olaf Hassel, Achmarof, and Jurlof. The comet had a magnitude of 3 upon discovery.
C/1961 T1 (Seki) is a long-period comet discovered by Tsutomu Seki on 10 October 1961. The comet has been identified as the parent body of the December ρ-Virginids meteor shower.
C/1975 T2 (Suzuki–Saigusa–Mori) is a long-period comet discovered on 5 October 1975. The comet approached Earth at a distance of 0.1 AU on 31 October 1975 and became visible with naked eye. The comet has been associated with the lambda Ursae Majorids meteor shower.
C/1991 L3 (Levy) is a periodic comet discovered by David H. Levy on 14 June 1991. The comet has an orbital period of 51 years and thus fits the definition of Halley-type comets, which have orbital periods between 20 and 200 years.
C/1961 O1 (Wilson–Hubbard) is a non-periodic comet discovered on 23 July 1961. The comet passed perihelion on 17 July, became visible in twilight on 23 July, having a long tail, and faded rapidly, becoming no longer visible with the naked eye after the first days of August.
C/1988 A1 (Liller) is a non-periodic comet discovered on 11 January 1988 by William Liller. The comet is part of a family of comets, known as the Liller family, which also includes the comets C/1996 Q1 (Tabur), C/2015 F3 (SWAN), C/2019 Y1 (ATLAS), and C/2023 V5 (Leonard).
