49P AREND RIGAUX
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Sylvain ArendSylvain Julien Victor Arend (6 August 1902 – 18 February 1992) was a Belgian astronomer born in Robelmont, Luxembourg province, Belgium. His main interest was astrometry. Together with Georges Roland, he discovered the bright comet C/1956 R1 (Arend-Roland). He also discovered, or co-discovered, the periodic comets 49P/Arend-Rigaux and 50P/Arend, Nova Scuti 1952, and a number of asteroids, including notably the Amor asteroid 1916 Boreas and the Trojan asteroid 1583 Antilochus. He also discovered 1652 Hergé which is named after Hergé, the creator of The Adventures of Tintin. The asteroid 1563 Noël is named after his son, Emanuel Arend. In 1948, Arend started together with sixteen other people the skeptic organisation Comité Para. The outer main-belt asteroid 1502 Arenda was named in his honor.
Fernand RigauxFernand Rigaux (1905 – 21 September 1962) was a Belgian astronomer and observer of variable stars, minor planets and comets at the Royal Observatory at Uccle, Belgium. In 1951, he co-discovered the periodic comet 49P/Arend-Rigaux with his colleague Sylvain Arend. He is also credited by the Minor Planet Center with the discovery of 8 asteroids between 1933 and 1941. The asteroid 19911 Rigaux, discovered by himself at Uccle in 1933, was named in his memory. Naming citation was published on 25 December 2015 (M.P.C. 97568).
48P/Johnson48P/Johnson is a periodic comet in the Solar System. The comet nucleus is estimated to be 5.74 km (3.57 mi) in diameter by Lamy, Fernandez, and Weaver. Meanwhile, David C. Jewitt and Scott S. Sheppard estimate the nucleus to have dimensions of 6.0 × 4.4 km (3.7 × 2.7 mi).
49P/Arend–Rigaux49P/Arend–Rigaux is a periodic comet in the Solar System.
50P/ArendComet Arend or 50P/Arend is a periodic comet in the Solar System which was discovered on October 4, 1951. It was discovered by astronomer Sylvain Julien Victor Arend at the Royal Observatory of Belgium located in the municipality of Uccle. The comet was illustrated at approximately a magnitude of 14 and also exhibited a nucleus within a coma 14 arc seconds across. From its discovery, the comet has had 7 perihelions with its last return of Earth recorded on November 1, 2007. The comet's next perihelion will be in the year 2024.
List of numbered cometsThis is a list of periodic comets that were numbered by the Minor Planet Center after having been observed on at least two occasions. Their orbital periods vary from 3.2 to 366 years. As of April 2025 there are 499 numbered comets (1P–499P). There are 405 Jupiter-family comets (JFCs), 38 Encke-type comets (ETCs), 14 Halley-type comets (HTCs), five Chiron-type comets (CTCs), and one long-period comet (153P). 75 bodies are also near-Earth comets (NECs). In addition, eight numbered comets are principally classified as minor planets – five main-belt comets, two centaurs (CEN), and one Apollo asteroid – and display characteristics of both an asteroid and a comet. Occasionally, comets will break up into multiple chunks, as volatiles coming off the comet and rotational forces may cause it to break into two or more pieces. An extreme example of this is 73P/Schwassmann–Wachmann, which broke into over 50 pieces during its 1995 perihelion.
Comet NEOWISEC/2020 F3 (NEOWISE) or Comet NEOWISE is a long period comet with a near-parabolic orbit discovered on March 27, 2020, by astronomers during the NEOWISE mission of the Wide-field Infrared Survey Explorer (WISE) space telescope. At that time, it was an 18th-magnitude object, located 2.0 AU (300 million km; 190 million mi) away from the Sun and 1.7 AU (250 million km; 160 million mi) away from Earth. NEOWISE is known for being the brightest comet in the northern hemisphere since Comet Hale–Bopp in 1997. It was widely photographed by professional and amateur observers and was even spotted by people living near city centers and areas with light pollution. While it was too close to the Sun to be observed at perihelion, it emerged from perihelion around magnitude 0.5 to 1, making it bright enough to be visible to the naked eye. Under dark skies, it could be seen with the naked eye and remained visible to the naked eye throughout July 2020. By July 30, the comet was about magnitude 5, when binoculars were required near urban areas to locate the comet. For observers in the Northern Hemisphere, the comet could be seen on the northwestern horizon, below the Big Dipper. North of 45 degrees north, the comet was visible all night in mid-July 2020. On July 30, Comet NEOWISE entered the constellation of Coma Berenices, below the bright star Arcturus. NEOWISE was retroactively dubbed the Great Comet of 2020.
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