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langs: 20 апреля [ru] / april 20 [en] / 20. april [de] / 20 avril [fr] / 20 aprile [it] / 20 de abril [es]

days: april 17 / april 18 / april 19 / april 20 / april 21 / april 22 / april 23

Asteroid / Asteroid


#1 508 Princetonia

Princetonia ( minor planet designation : 508 Princetonia ) is an asteroid , a minor planet orbiting the Sun . It was discovered by Raymond Smith Dugan at Heidelberg , Germany in 1903 and named "Princetonia" for Princeton University in New Jersey in the United States . [4] 508 Princetonia Shape of Pr

#2 532 Herculina

532 Herculina / h ɜːr k j ʊ ˈ l aɪ n ə / is a large asteroid , with a diameter of around 200   km. Main-belt asteroid 532 Herculina A three-dimensional model of 532 Herculina based on its light curve Discovery Discovered   by Max Wolf Discovery   date 20 April 1904 Designations MPC   designation (53

#3 786 Bredichina

786 Bredichina ( prov. designation : A914 HD or 1914 UO ) is a carbonaceous and very large background asteroid , approximately 104 kilometers (65 miles) in diameter, located in the outer region of the asteroid belt . It was discovered by German astronomer Franz Kaiser at the Heidelberg-Königstuhl St

#4 (184212) 2004 PB112

(184212) 2004 PB 112 , prov. designation : 2004 PB 112 , is a trans-Neptunian object from the scattered disc , approximately 154 kilometers (96 miles) in diameter, and in a rare high-order orbital resonance ratio ( 4:27 ) with Neptune . It was discovered on 13 August 2004, by American astronomer Mar

#5 4 Vesta

Vesta ( minor-planet designation : 4 Vesta ) is one of the largest objects in the asteroid belt , with a mean diameter of 525 kilometres (326   mi) . [10] It was discovered by the German astronomer Heinrich Wilhelm Matthias Olbers on 29 March 1807 [6] and is named after Vesta , the virgin goddess of

#6 1575 Winifred

1575 Winifred , provisional designation 1950 HH , is a stony Phocaea asteroid and slow rotator from the inner regions of the asteroid belt , approximately 9.5 kilometers in diameter. Asteroid 1575 Winifred Discovery [1] Discovered   by Indiana University ( Indiana Asteroid Program ) Discovery   site

#7 787 Moskva

787 Moskva is a minor planet orbiting the Sun . It is a dynamic member of the Maria asteroid family orbiting near the 3:1 Kirkwood gap . [4] This is an S-type (stony) asteroid spanning 27   km. [5] The surface mineralogy is consistent with mesosiderite silicates . [4] 787 Moskva A three-dimensional

#8 2059 Baboquivari

2059 Baboquivari , provisional designation 1963 UA , is an asteroid classified as near-Earth object of the Amor group , approximately 1.9 kilometers in diameter. Discovered by the Indiana Asteroid Program in 1963, it was later named after the Baboquivari Mountains in Arizona, United States. Near-Ear

#9 216 Kleopatra

216 Kleopatra is a large M-type asteroid with a mean diameter of 120 kilometers (75 miles) and is noted for its elongate bone or dumbbell shape. [18] [19] [8] [20] It was discovered on 10 April 1880 by Austrian astronomer Johann Palisa at the Austrian Naval Pola Observatory , in what is now Pula , C

#10 52246 Donaldjohanson

52246 Donaldjohanson , provisional designation 1981 EQ 5 , is a carbonaceous Erigonian asteroid from the inner regions of the asteroid belt , approximately 4 kilometers (2.5 miles) in diameter. It was discovered on 2 March 1981, by American astronomer Schelte Bus at the Siding Spring Observatory in

#11 List of minor planets discovered using the WISE spacecraft

The following is a list of numbered minor planets discovered, co-discovered and re-discovered by the Wide-field Infrared Survey Explorer (WISE), a NASA infrared spaceborne observatory. As of July 2018, the list contains 4093 entries, accredited by the Minor Planet Center as discovered by "WISE". Not


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Book / Book


#1 Bad Astronomy

Bad Astronomy: Misconceptions and Misuses Revealed, from Astrology to the Moon Landing "Hoax" is a non-fiction book by the American astronomer Phil Plait , also known as "the Bad Astronomer". The book was published in 2002 and deals with various misunderstandings about space and astronomy, such as s


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Comet / Comet


#1 103P/Hartley

Comet Hartley 2 , designated as 103P/Hartley by the Minor Planet Center , [5] is a small periodic comet with an orbital period of 6.46 years. [1] It was discovered by Malcolm Hartley in 1986 at the Schmidt Telescope Unit , Siding Spring Observatory , Australia. [1] Its diameter is estimated to be 1.

#2 C/1989 X1 (Austin)

C/1989 X1 (Austin) (old-style designations 1990 V and 1989c1) 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/1989 X1 (Austin)

#3 32P/Comas Solà

32P/Comas Solà is a periodic comet with a current orbital period of 8.8 years. Periodic comet with 9 year orbit 32P/Comas Solà Discovery Discovered by Josep Comas i Solà Discovery date November 5, 1926 Alternative designations 1944 II; 1952 VII; 1951h; 1961 III; 1960f; 1969 VIII; 1968g; 1978 XVII; 1

#4 Great January Comet of 1910

The Great January Comet of 1910 , formally designated C/1910 A1 and often referred to as the Daylight Comet , [2] was a comet which appeared in January 1910. It was already visible to the naked eye when it was first noticed, and many people independently "discovered" the comet. At its brightest, it

#5 Halley's Comet

Halley's Comet or Comet Halley , officially designated 1P/Halley , is a short-period comet visible from Earth every 75–79 years. [1] Halley is the only known short-period comet that is regularly visible to the naked eye from Earth, and thus the only naked-eye comet that can appear twice in a human l

#6 C/2012 F6 (Lemmon)

C/2012 F6 (Lemmon) is a long-period comet discovered in Leo on 23 March 2012, by A. R. Gibbs [1] using the 1.5-m   reflector at the Mt. Lemmon Survey , located at the summit of Mount Lemmon in the Santa Catalina Mountains north of Tucson, Arizona , USA. Initially, the object was considered to be of

#7 C/2020 F5 (MASTER)

C/2020 F5 (MASTER) is a long period comet discovered on 28 March 2020, [1] by the MASTER auto-detection system near San Juan, Argentina. When first discovered there were dubious claims that it might be an interstellar object , [2] but now it is known to have a common weakly hyperbolic eccentricity o

#8 C/1861 J1

The Great Comet of 1861 , formally designated C/1861 J1 and 1861 II , is a long-period comet that was visible to the naked eye for approximately 3 months. [3] It was categorized as a great comet —one of the eight greatest comets of the 19th century. [3] Astronomical object C/1861 J1 Discovery Discov

#9 C/2019 Y4 (ATLAS)

C/2019 Y4 (ATLAS) (or Comet ATLAS ) is a comet with a near-parabolic orbit discovered by the ATLAS survey on December 28, 2019. [3] Early predictions based on the brightening rate suggested that the comet could become as bright as magnitude 0 matching the brightness of Vega . [4] It received widespr

#10 C/1702 H1

C/1702 H1 (also known as "the comet of 1702") is a comet discovered by Maria Margaretha Kirch in Germany on April 20, 1702. C/1702 H1 Discovery Discovered by Maria Kirch Discovery date April 20, 1702 Alternative designations C/1702 H1 "Comet of 1702"

#11 Comet Encke

Comet Encke / ˈ ɛ ŋ k i / , or Encke's Comet (official designation: 2P/Encke ), is a periodic comet that completes an orbit of the Sun once every 3.3 years. (This is the shortest period of a reasonably bright comet; the faint main-belt comet 311P/PanSTARRS has a period of 3.2 years.) Encke was first


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Galaxy / Galaxy


#1 NGC 2277

NGC 2277 is what appears to be an open cluster in the constellation Gemini . It was first observed on 20 April 1865 by the German astronomer Heinrich Louis d'Arrest . [2] However, it is simply an asterism formed by several stars in the sky appearing close together. [2] Open cluster in the constellat

#2 NGC 6002

NGC 6002 is a star located in the constellation Corona Borealis . It was discovered on 20 April 1873. [1] Star in the constellation Corona Borealis The topic of this article may not meet Wikipedia's notability guideline for astronomical objects . ( January 2021 )


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Institution / Institution


#1 Air Force Maui Optical and Supercomputing observatory

The Air Force Maui Optical and Supercomputing observatory is an Air Force Research Laboratory (AFRL) operating location at Haleakala Observatory on Maui , Hawaii , with a twofold mission ( 608 ). First, it conducts the research and development mission on the Maui Space Surveillance System (MSSS) at

#2 Thirty Meter Telescope protests

The Thirty Meter Telescope protests are a series of protests and demonstrations that began on the Island of Hawaii over the choosing of Mauna Kea for the site location of the Thirty Meter Telescope . Mauna Kea is the most sacred dormant volcano of Native Hawaiian religion and culture, and was known

#3 Commission for Dark Skies

The Commission for Dark Skies ( CfDS ) (formerly the Campaign for Dark Skies ; the name was changed on March 29, 2015) is the United Kingdom 's largest anti- light-pollution campaign group forming part of the international dark-sky movement . This article needs additional citations for verification

#4 Višnjan Observatory

Višnjan Observatory ( Croatian : Zvjezdarnica Višnjan ; obs. code: 120 ) is an astronomical observatory located near the village of Višnjan in Croatia . It is headed by Korado Korlević , a prolific astronomer and discoverer of minor planets . In 2009, the Višnjan observatory moved to Tičan (at 45°17

#5 Astronomical Observatory of Mallorca

The Astronomical Observatory of Mallorca ( Spanish : Observatorio Astronómico de Mallorca , OAM ) is an observatory just south of Costitx , Mallorca , Spain . [3] Observatory Astronomical Observatory of Mallorca Alternative   names ca Observatory   code 620   Location Costitx , Mallorca , Spain Coor

#6 Maragheh observatory

Maragheh observatory ( Persian : رصدخانه مراغه ) was an astronomical observatory established in 1259 CE under the patronage of the Ilkhanid Hulagu and the directorship of Nasir al-Din al-Tusi , a Persian scientist and astronomer . Located in the heights west of Maragheh , which is today situated in

#7 List of solar eclipses visible from Russia

This list of solar eclipses visible from Russia enumerates the solar eclipses that have been seen and will be seen in Russia . Lists of solar eclipses Geometry of a total solar eclipse (not to scale) Solar eclipses in antiquity Solar eclipses in the Middle Ages Modern history 16th 17th 18th 19th 20t

#8 Thirty Meter Telescope

The Thirty Meter Telescope ( TMT ) is a planned extremely large telescope (ELT) [5] [6] that has become controversial due to its location on Mauna Kea , [7] [8] [9] [10] on the island of Hawaiʻi . The TMT would become the largest visible-light telescope on Mauna Kea. [11] [12] Future observatory in

#9 Markree Observatory

Markree Observatory was an astronomical observatory in County Sligo , Ireland . [1] [2] [3] The asteroid 9 Metis was discovered from this observatory in 1848 by Cooper's assistant Andrew Graham using a comet seeker telescope. [4] [2] The observatory was also home to the largest refractor of the earl

#10 Purple Mountain Observatory

The Purple Mountain Observatory ( Chinese : 紫金山天文台 ; pinyin : Zǐjīnshān Tiānwéntái ), also known as Zijinshan Astronomical Observatory is an astronomical observatory located on the Purple Mountain in the east of Nanjing . [lower-alpha 1] Observatory Purple Mountain Observatory Purple Mountain Observ

#11 Aryabhatta Research Institute of Observational Sciences

Aryabhatta Research Institute of Observational Sciences (ARIES) is a research institute in Nainital , Kumaon , India which specializes in astronomy , solar physics , astrophysics and atmospheric science . It is an autonomous body under the Department of Science and Technology , Government of India .

#12 Kleť Observatory

Kleť Observatory ( Czech : Hvězdárna Kleť ; obs. code : 046 ) is an astronomical observatory in the Czech Republic . It is situated in South Bohemia , south of the summit of Mount Kleť , near the town of České Budějovice . Constructed in 1957, the observatory is at an altitude of 1,070 metres (3,510

#13 List of solar eclipses visible from Ukraine

This list of solar eclipses seen from Ukraine enumerates the solar eclipses that were seen and will be seen in Ukraine . Lists of solar eclipses Geometry of a total solar eclipse (not to scale) Solar eclipses in antiquity Solar eclipses in the Middle Ages Modern history 16th 17th 18th 19th 20th 21st


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Meteorite / Meteorite


#1 LHS 1140 b

LHS 1140 b is a massive, dense rocky planet orbiting within the conservative habitable zone of the red dwarf LHS 1140 . Discovered in 2017 by the MEarth Project , LHS 1140 b is nearly 7 times the mass of Earth and over 60% larger in radius, putting it within the Super-Earth category of planets. It i


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Researcher / Researcher


#1 Kin Endate

Kin Endate ( 円館 金 , Endate Kin , born December 15, 1960) is a Japanese amateur astronomer who has discovered hundreds of asteroids, most of them in collaboration with Kazuro Watanabe , placing him among the most prolific discoverers of minor planets . [1] Minor planets discovered: 624   [1] see §  

#2 Gersonides

Levi ben Gershon (1288 – 20 April 1344), better known by his Graecized name as Gersonides , or by his Latinized name Magister Leo Hebraeus , [1] or in Hebrew by the abbreviation of first letters as R a LB a G , [2] was a medieval French Jewish philosopher , Talmudist, mathematician , physician and a

#3 Max Wolf

Maximilian Franz Joseph Cornelius Wolf (21 June 1863 – 3 October 1932) was a German astronomer and a pioneer in the field of astrophotography . He was the chairman of astronomy at the University of Heidelberg and director of the Heidelberg-Königstuhl State Observatory from 1902 until his death in 19

#4 Kazuro Watanabe

Kazurō Watanabe ( 渡辺 和郎 , Watanabe Kazurō , born May 1, 1955) is a Japanese amateur astronomer and prolific discoverer of minor planets . [2] He was born in Hokkaidō , Japan and is a member of the Astronomical Society of Japan as well as of the Oriental Astronomical Association . Japanese astronomer

#5 Louis Fabry

Louis Fabry was a French astronomer who was born in Marseille , April 20, 1862, and died in Les Lecques , January 26, 1939. French astronomer Louis Fabry.

#6 Jean Baptiste Gaspard Bochart de Saron

Jean-Baptiste-Gaspard Bochart de Saron (16 January 1730 – 20 April 1794) was a French magistrate in the Parlement of Paris and an amateur astronomer, chemist and mathematician who took an interest in the orbits of comets. He was executed by guillotine during the Reign of Terror . De Saron was born i

#7 Albrecht Unsöld

Albrecht Otto Johannes Unsöld (20 April 1905 – 23 September 1995) was a German astrophysicist known for his contributions to spectroscopic analysis of stellar atmospheres. German astrophysicist (1905-1995) Utrecht Astronomy Symposium 1963. Left to right: Marcel Minnaert , Albrecht Unsöld, Miep Minna

#8 Lenka Kotková

Lenka Kotková ( née Šarounová ; born 26 July 1973) is a Czech astronomer and a discoverer of minor planets . Czech astronomer, asteroid discoverer Lenka Kotková ( née Šarounová) Lenka Kotková at the Ondřejov Observatory Born ( 1973-07-26 ) 26 July 1973 (age   48) Dobřichovice , Czechoslovakia Nation

#9 Takeshi Urata

Takeshi Urata ( 浦田 武 , Urata Takeshi , 1947 – December 15, 2012) [2] was a Japanese astronomer . He was a prolific discoverer of asteroids , observing at Nihondaira Observatory . Japanese astronomer Minor planets discovered: 642   [1] see §   List of discovered minor planets In 1978 he became the fi

#10 Jeong Seon

Jeong Seon ( Korean : 정선 ) (1676 – 20 April 1759) [1] was a Korean landscape painter, also known by the pen name Kyomjae . His cha was Wonbaek and another ho was Nangok. His works include ink and oriental water paintings, such as Inwangjesaekdo (1751), Geumgang jeondo (1734), and Ingokjeongsa (1742)

#11 Robert H. McNaught

Robert H. McNaught (born in Scotland in 1956) is a Scottish-Australian astronomer at the Research School of Astronomy and Astrophysics of the Australian National University (ANU). He has collaborated with David J. Asher of the Armagh Observatory . Scottish-Australian astronomer (born 1956) Minor pla

#12 John Broughton

John Broughton (born 1952) [2] is an Australian amateur astronomer and artist. He is among the most prolific discoverers of minor planets worldwide, credited by the Minor Planet Center with more than a thousand discoveries made between 1997 and 2008. [1] His observations are done at Reedy Creek Obse

#13 Grigory Neujmin

Grigory Nikolayevich Neujmin ( Russian : Григорий Николаевич Неуймин ; 3 January 1886 [ O.S. 22 December 1885 ] – 17 December 1946) was a Georgian– Russian astronomer , native of Tbilisi in Georgia , [2] and a discoverer of numerous minor planets as well as 6 periodic and a hyperbolic comet at the P

#14 Dušan Kalmančok

Dušan Kalmančok (born 1945) is a Slovak astronomer and co-discoverer of minor planets . [2] Slovak astronomer Minor planets discovered: 7   [1] 11118 Modra August 9, 1996 [1] MPC 15860 Siráň April 20, 1996 [1] MPC 24194 Paľuš December 8, 1999 [1] MPC 38238 Holíč July 18, 1999 [2] MPC 48934 Kočanová

#15 Vincenzo Cerulli

Vincenzo Cerulli (20 April 1859 – 30 May 1927) was an Italian astronomer and founder of the Collurania-Teramo Observatory in Teramo , central Italy, where he was born. [2] [3] [4] Italian astronomer Vincenzo Cerulli Born ( 1859-04-20 ) 20 April 1859 Teramo , Italy Died 30 May 1927 (1927-05-30) (aged

#16 William Kwong Yu Yeung

William Kwong Yu Yeung (born 1960; also known simply as Bill Yeung ; Chinese : 楊光宇 ) is a Hong Kong -born, Canadian amateur astronomer with telescopes based in the United States . [2] [3] Astronomer noted for the discovery of over 2,000 minor planets Minor planets discovered: 2031   [1] see §   List

#17 Paulo R. Holvorcem

Paulo Renato Centeno Holvorcem (born 10 July 1967) is a Brazilian amateur astronomer and mathematician who lives in Brasilia , Brazil . Minor planets discovered: 224   [1] credited by the MPC , as per September 2016 He is a prolific discoverer of asteroids . He is credited by the Minor Planet Center

#18 Wolf Bickel

Wolf Bickel (born 6 July 1942, Bensberg ) is a German amateur astronomer and a prolific discoverer of asteroids , observing at his private Bergisch Gladbach Observatory , Germany. He is the most successful German discoverer of minor planets . [2] [3] German astronomer Minor planets discovered: 687  

#19 Takao Kobayashi

Takao Kobayashi ( 小林 隆男 , Kobayashi Takao , born 1961) is a Japanese amateur astronomer and an outstanding discoverer of minor planets who currently works at the Ōizumi Observatory . The asteroid 3500 Kobayashi is named after him. [2] Minor planets discovered: 2479   [1] see §   List of discovered m

#20 Amalia Ercoli Finzi

Amalia Ercoli Finzi ( née Amalia Ercoli ; born 20 April 1937) is an Italian engineer and professor, Principal Investigator of the SD2 drill aboard the Philae spacecraft . Italian astrophysicist Amalia Ercoli Finzi Born 20 April 1937 Gallarate , Italy Alma   mater Polytechnic University of Milan Empl


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Star / Star


#1 T Coronae Borealis

T Coronae Borealis ( T CrB ), is a recurring nova in the constellation Corona Borealis . It was first discovered in outburst in 1866 by John Birmingham , [11] although it had been observed earlier as a 10th magnitude star. [12] Recurrent nova in the constellation Corona Borealis T Coronae Borealis L

#2 WR 102ka

WR 102ka , also known as the Peony star , is a slash star that is one of several candidates for the most luminous -known star in the Milky Way . [5] Star in the constellation Sagittarius WR 102ka The "Peony Nebula," as discovered by NASA's Spitzer Space Telescope . This three-color infrared composit

#3 Micronova

A micronova is a type of thermonuclear explosion on the surface of a white dwarf much smaller than the strength of a nova ; being about 1 × 10 39 ergs (1.0 × 10 −12   foe ; 1.0 × 10 32   J ) in strength, about a millionth that of a typical nova. The phenomenon was first described in April 2022. [1]


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