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langs: 21 апреля [ru] / april 21 [en] / 21. april [de] / 21 avril [fr] / 21 aprile [it] / 21 de abril [es]

days: april 18 / april 19 / april 20 / april 21 / april 22 / april 23 / april 24

Asteroid / Asteroid


#1 162 Laurentia

162 Laurentia is a large and dark main-belt asteroid that was discovered by the French brothers Paul Henry and Prosper Henry on 21 April 1876, and named after Joseph Jean Pierre Laurent , an amateur astronomer who discovered asteroid 51 Nemausa . Main-belt asteroid 162 Laurentia A three-dimensional

#2 5318 Dientzenhofer

5318 Dientzenhofer , provisional designation 1985 HG 1 , is a stony background asteroid from the inner regions of the asteroid belt , approximately 6 kilometers (3.7 miles) in diameter. It was discovered on 21 April 1985, by Czech astronomer Antonín Mrkos at the Kleť Observatory in Bohemia, Czech Re

#3 3851 Alhambra

3851 Alhambra , provisional designation 1986 UZ , is a stony Flora asteroid and relatively slow rotator from the inner regions of the asteroid belt , approximately 7 kilometers in diameter. It was discovered on 30 October 1986, by Japanese astronomer Tsutomu Seki at Geisei Observatory in Kōchi, Japa

#4 786 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

#5 470 Kilia

Kilia / ˈ k ɪ l i ə / ( minor planet designation : 470 Kilia ) (1901 GJ) is a 27 km main-belt asteroid discovered on 21 April 1901 by Luigi Carnera at Heidelberg . [1] It potentially takes 290 hours to rotate. [1] 470 Kilia Discovery Discovered   by Luigi Carnera Discovery   site Heidelberg Observat

#6 4756 Asaramas

4756 Asaramas , provisional designation 1950 HJ , is a stony rare-type Eoan asteroid from the outer region of the asteroid belt , approximately 11 kilometers in diameter. It was discovered on 21 April 1950, by astronomers at the La Plata Astronomical Observatory in Argentina. [7] It is named for the

#7 1505 Koranna

1505 Koranna , provisional designation 1939 HH , is a stony Eunomia asteroid from the central regions of the asteroid belt , approximately 21 kilometers in diameter. It was discovered on 21 April 1939, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg. [11] The aster

#8 137 Meliboea

137 Meliboea is a large, dark main-belt asteroid that was discovered by Austrian astronomer J. Palisa at the Austrian Naval Observatory on 21 April 1874, the second of his many asteroid discoveries. It was later named after one of the three Meliboeas in Greek mythology . The largest body in the Meli

#9 130 Elektra

Elektra ( minor planet designation : 130 Elektra ) is a large outer main-belt asteroid and quadruple system with three minor-planet moons . It was discovered on 17 February 1873, by astronomer Christian Peters at Litchfield Observatory , New York, and named after Electra , an avenger in Greek mythol

#10 12923 Zephyr

12923 Zephyr ( prov. designation : 1999 GK 4 ) is a stony asteroid , classified as potentially hazardous asteroid and near-Earth object of the Apollo group , approximately 2 kilometers (1.2 miles) in diameter. It was discovered on 11 April 1999, by astronomers of the Lowell Observatory Near-Earth Ob

#11 2012 FC71

2012 FC 71 , also written 2012 FC71 , is a small asteroid trapped in a Kozai resonance with the Earth . [4] 2012 FC 71 Discovery [1] Discovered   by Mt. Lemmon Survey A. Boattini (unofficial credits) Discovery   date 31 March 2012 Designations MPC   designation 2012 FC 71 Minor   planet category NEO

#12 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

#13 3070 Aitken

3070 Aitken , provisional designation 1949 GK , is a stony Flora asteroid from the inner regions of the asteroid belt , approximately 4 kilometers in diameter. It was discovered on 4 April 1949, by astronomers of the Indiana Asteroid Program at Goethe Link Observatory in Indiana, United States. The

#14 3822 Segovia

3822 Segovia ( prov. designation : 1988 DP 1 ) is a stony Flora asteroid from the inner regions of the asteroid belt . It was discovered by Japanese astronomer Tsutomu Seki at Geisei Observatory in Kōchi, Japan, on 21 February 1988. [6] The presumed S-type asteroid has a rotation period of 11.0 hour

#15 20325 Julianoey

20325 Julianoey , provisional designation 1998 HO 27 , is a Vestian asteroid and a synchronous binary system from the inner regions of the asteroid belt , approximately 5 kilometers (3 miles) in diameter. It was discovered on 21 April 1998, by astronomers of the Spacewatch survey at Kitt Peak Nation

#16 1264 Letaba

1264 Letaba , provisional designation 1933 HG , is a carbonaceous asteroid and possible tumbler from the background population of the outer asteroid belt , approximately 70 kilometers in diameter. It was discovered on 21 April 1933, by South African astronomer Cyril Jackson at the Union Observatory


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Comet / Comet


#1 C/2008 T2 (Cardinal)

C/2008 T2 (Cardinal) , is a non-periodic comet . It was discovered by Rob. D. Cardinal from the University of Calgary . [1] [4] [5] It was visible as a telescopic and binocular object during 2009. [5] [6] It passed near the Perseus star clusters NGC 1528 on March 15 and NGC 1545 on March 17, 2009. [

#2 12P/Pons–Brooks

12P/Pons–Brooks is a periodic comet with an orbital period of 71 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years). [1] The next perihelion passage is 21 April 2024, [7] [lower-alpha 1] with closest approach to Earth being 1.54   AU (230   million  

#3 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

#4 Great Comet of 1901

The Great Comet of 1901 , sometimes known as Comet Viscara , formally designated C/1901 G1 (and in the older nomenclature as 1901 I and 1901a ), was a comet which became bright in the spring of 1901. Visible exclusively (or almost exclusively) [2] from the southern hemisphere , it was discovered on

#5 C/2021 O3 (PanSTARRS)

C/2021 O3 (PanSTARRS) was an Oort cloud comet , discovered on 26 July 2021 by the Pan-STARRS sky survey. It came to perihelion on 21 April 2022 at 0.287   AU (42.9   million   km ) . from the Sun. C/2021 O3 (PanSTARRS) Discovery Discovered by Pan-STARRS Discovery date 26 July 2021 Orbital characteri

#6 C/2007 E2 (Lovejoy)

C/2007 E2 (Lovejoy) is a non-periodic comet discovered by Terry Lovejoy on 15 March 2007. Its perihelion was 27 March 2007, while its closest approach to Earth was 25 April 2007 in Hercules at a distance of 0.44 AU . Maximum apparent magnitude was approximately +8. [2] Astronomical object For other


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Galaxy / Galaxy


#1 NGC 4860

NGC 4860 is an elliptical galaxy in the constellation Coma Berenices . The galaxy was discovered on 21 April 1865 by Heinrich Louis d'Arrest . [2] Elliptical galaxy in the constellation Coma Berenices NGC 4860 Eliptical galaxy NGC 4860 (center) and spiral galaxy NGC 4858 (left). Observation data ( J

#2 NGC 4848

NGC 4848 is a barred spiral galaxy in the constellation Coma Berenices . It is circa 340   million light-years from Earth, which, given its apparent dimensions, means that NGC 4848 is about 170,000 light years across. It was discovered by Heinrich d'Arrest on April 21, 1865. [3] It is considered par


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Institution / Institution


#1 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

#2 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

#3 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

#4 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

#5 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

#6 Union Observatory

Union Observatory also known as Johannesburg Observatory ( 078 ) is a defunct astronomical observatory in Johannesburg , South Africa that was operated between 1903 and 1971. It is located on Observatory Ridge , the city's highest point at 1,808 metres altitude in the suburb Observatory . [1] [2] De

#7 Asociación Argentina Amigos de la Astronomía

Asociación Argentina Amigos de la Astronomía ( AAAA , A.A.A.A. or asaramas ; the Argentinian Association of the Friends of Astronomy ; obs   code : 834 ) is an amateur astronomy civil association based on Buenos Aires , Argentina , with the aim of spreading astronomy. [1] It was founded on January 4

#8 KAGRA

The Kamioka Gravitational Wave Detector ( KAGRA ), is a large interferometer designed to detect gravitational waves predicted by the general theory of relativity . KAGRA is a Michelson interferometer that is isolated from external disturbances: its mirrors and instrumentation are suspended and its l

#9 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

#10 Črni Vrh Observatory

The Črni Vrh Observatory ( Slovene : Observatorij Črni Vrh , IAU code : 106 ) is an astronomical observatory located in western Slovenia , close to the settlement of Črni Vrh , near the town of Idrija . The current observatory was built in 1985 and stands at an elevation of 730 metres (2,400   ft) .

#11 Campo Imperatore Near-Earth Object Survey

The CINEOS program ( Campo Imperatore Near-Earth Object Survey ), started in 2001, is dedicated to the discovery and follow-up of near-Earth objects (NEOs), namely asteroids and comets which periodically approach or intersect the Earth's orbit . In particular CINEOS is addressed to the discovery of

#12 Pises Observatory

Pises Observatory is an astronomical observatory at the Parc National des Cévennes in France . It is situated at 1300 m altitude and houses an optical telescope with a charge-coupled device used for asteroid surveys. Minor planets discovered: 41   [1] see §   List of discovered minor planets Observa


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Meteorite / Meteorite


#1 Gliese 581e

Gliese 581e / ˈ ɡ l iː z ə / or Gl 581e is an extrasolar planet orbiting within the Gliese 581 system , located approximately 20.4 light-years away from Earth in the Libra constellation . It is the third planet discovered in the system (fourth if the disputed planet candidate Gliese 581d is included

#2 Zaklodzie meteorite

The Zakłodzie meteorite is a stony-iron meteorite found in Poland in 1998. Its mass is 8.68 kilograms (19.1   lb) . It is composed predominantly from enstatite and meteoric iron . Currently classified as an ungrouped enstatite achondrite its classification is still an ongoing scientific debate. [2]

#3 Gliese 581c

Gliese 581c / ˈ ɡ l iː z ə / ( Gl 581c or GJ 581c ) is a planet orbiting within the Gliese 581 system. It is the second planet discovered in the system and the third in order from the star . With a mass at least 5.5 times that of the Earth , it is classified as a super-Earth (a category of planets w


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Researcher / Researcher


#1 Arnold O. Benz

Arnold O. Benz (born 21 April 1945) is a professor emeritus at the Institute for Particle Physics and Astrophysics in the Physics Department of ETH Zurich . [1] Arnold Benz Arnold O. Benz in 2013 Born ( 1945-04-21 ) 21 April 1945 (age   77) Winterthur , Switzerland Nationality Swiss Alma   mater Cor

#2 Philippe de La Hire

Philippe de La Hire (or Lahire , La Hyre or Phillipe de La Hire ) (18 March 1640 – 21 April 1718) [1] was a French painter , mathematician , astronomer , and architect . [2] According to Bernard le Bovier de Fontenelle he was an "academy unto himself". For other people named La Hire, see La Hire (di

#3 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 §  

#4 John Hartnup Jr.

John Hartnup Jr. (1841 – 21 April 1892) was the second director of the Liverpool Observatory (which has since moved to become the Bidston Observatory ) located at the West Waterloo Dock on the River Mersey in Liverpool , England . He served as the director of the observatory from 1888 until his deat

#5 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

#6 Satoru Otomo

Satoru Otomo ( 大友 哲 , Ōtomo Satoru, 19 December 1957, Mitaka ) is a Japanese dentist, amateur astronomer and a discoverer of minor planets . [2] Minor planets discovered: 148   [1] see §   List of discovered minor planets According to the Minor Planet Center , he is credited with the discovery of 14

#7 Iván Almár

Iván Almár (born April 21, 1932 in Budapest ) is a Hungarian astronomer . [1] He proposed the San Marino Scale as a means of assessing risks related to extraterrestrial communication. [2] Almár also serves on the Advisory Council of METI (Messaging Extraterrestrial Intelligence) . Asteroid 191856 Al

#8 Maria Margaretha Kirch

Maria Margaretha Kirch ( née Winckelmann , in historic sources named Maria Margaretha Kirchin ; 25 February 1670 – 29 December 1720) was a German astronomer . She was one of the first famous astronomers of her period due to her writing on the conjunction of the sun with Saturn , Venus , and Jupiter

#9 Richard D. Lines

Richard D. Lines (April 21, 1916 – June 29, 1992) was an American amateur astronomer . He started as a deep-sky observer and photographer , but later specialized in photometry of variable stars . He was a member of the American Association of Variable Star Observers and International Amateur-Profess

#10 Eugene Merle Shoemaker

Eugene Merle Shoemaker (April 28, 1928   – July 18, 1997) was an American geologist . He co-discovered Comet Shoemaker–Levy 9 with his wife Carolyn S. Shoemaker and David H. Levy . This comet hit Jupiter in July 1994: the impact was televised around the world. Shoemaker also studied terrestrial crat

#11 Marc Buie

Marc William Buie ( / ˈ b uː i / ; born 1958) is an American astronomer and prolific discoverer of minor planets who works at the Southwest Research Institute in Boulder, Colorado in the Space Science Department. [1] Formerly he worked at the Lowell Observatory in Flagstaff, Arizona, and was the Sen

#12 Peter Kolény

Peter Kolény is a Slovak astronomer . He is a prolific discoverer of asteroids . [2] As of January 2010, the IAU Minor Planet Center credits him with the discovery or codiscovery of 35 asteroids. [3] Slovak astronomer Minor planets discovered: 35   [1] see §   List of discovered minor planets

#13 Pierre Antonini

Pierre Antonini is a retired French mathematics professor and amateur astronomer who has discovered several minor planets and two supernovae at his private Observatoire de Bédoin (Bedoin Observatory; observatory code: 132 ) located at Bédoin , southeastern France. For many of his discoveries he used

#14 Pierre Charles Le Monnier

Pierre Charles Le Monnier (23 November 1715 – 3 April 1799) was a French astronomer . His name is sometimes given as Lemonnier . French astronomer For other people with the surname Le Monnier or Lemonnier, see Le Monnier . Pierre Charles Le Monnier. "L'astronome" (The Astronomer) , circa 1777. Oil o

#15 Immanuel Halton

Immanuel Halton (1628 – 1699) was an English astronomer and mathematician , an associate of John Flamsteed .

#16 Milan Rastislav Štefánik

Milan Rastislav Štefánik ( Slovak pronunciation:   [ˈmilan ˈrascislaw ˈʂcefaːɲik] ( listen ) ; 21 July 1880 – 4 May 1919) was a Slovak politician, diplomat, aviator and astronomer. During World War I , he served at the same time as a general in the French Army and as Minister of War for Czechoslovak

#17 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

#18 Michel Ory

Michel Ory (born 18 April 1966) is a Swiss amateur astronomer and a prolific discoverer of minor planets and comets , [1] who was one of five winners of the 2009 Edgar Wilson Award for his discovery of 304P/Ory (P/2008 Q2 Ory), a periodic comet of the Jupiter family on 27 August 2008, [2] using a 24

#19 William Henry Stanley Monck

William Henry Stanley Monck (21 April 1839 – 24 June 1915) was an Irish astronomer and philosopher. After an early education at Kilkenny College, Monck attended Trinity College Dublin . In 1878 he was appointed as Professor of Moral Philosophy and remained in that position until 1892. On 28 August 1

#20 Guinevere Kauffmann

Guinevere Alice Mei-Ing Kauffmann was born in California. She is an astrophysicist and is known for her work studying galaxies among other subjects. American astrophysicist This biography of a living person needs additional citations for verification . ( March 2013 ) Guinevere Kauffmann Born 1968 Ca


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Star / Star


#1 Gliese 581

Gliese 581 ( / ˈ ɡ l iː z ə / ) is a red dwarf star of spectral type M3V at the center of the Gliese 581 planetary system, about 20 light years away from Earth in the Libra constellation . Its estimated mass is about a third of that of the Sun , and it is the 89th closest known star to the Sun. Glie

#2 V606 Aquilae

V606 Aquilae was a nova , which lit up in the constellation Aquila in 1899. The brightest reported magnitude for this nova was apparent magnitude 5.5, making it a naked eye object. [3] [4] It was discovered by Williamina Fleming on a photographic plate (one of the Henry Draper Memorial Photographs [


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