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langs: 23 апреля [ru] / april 23 [en] / 23. april [de] / 23 avril [fr] / 23 aprile [it] / 23 de abril [es]

days: april 20 / april 21 / april 22 / april 23 / april 24 / april 25 / april 26

Asteroid / Asteroid


#1 933 Susi

933 Susi is a minor planet orbiting the Sun . 933 Susi Discovery Discovered   by K. Reinmuth Discovery   site Heidelberg Discovery   date 10 February 1927 Designations MPC   designation (933) Susi Pronunciation German: [ˈzuːziː] [1] Alternative designations 1927 CH Orbital characteristics [2] Epoch

#2 715 Transvaalia

715 Transvaalia is a minor planet orbiting the Sun . 715 Transvaalia Discovery Discovered   by H. E. Wood Discovery   site Johannesburg Obs. Discovery   date 22 April 1911 Designations MPC   designation (715) Transvaalia Pronunciation / t r æ n z ˈ v ɑː l i ə / [1] Alternative designations 1911 LX O

#3 3581 Alvarez

3581 Alvarez , provisional designation 1985 HC , is a carbonaceous asteroid and a very large Mars-crosser on an eccentric orbit from the asteroid belt , approximately 13.7 kilometers (8.5 miles) in diameter. It was discovered on 23 April 1985, by American astronomer couple Carolyn and Eugene Shoemak

#4 Makemake

Makemake [lower-alpha 6] ( minor-planet designation 136472 Makemake ) is a dwarf planet and – depending on how they are defined – the second-largest Kuiper belt object in the classical population , [lower-alpha 2] with a diameter approximately 60% that of Pluto . [24] [25] It has one known satellite

#5 1225 Ariane

1225 Ariane , provisional designation 1930 HK , is a stony Florian asteroid from the inner regions of the asteroid belt , approximately 9 kilometers in diameter. It was discovered on 23 April 1930, by Dutch astronomer Hendrik van Gent at the Leiden Southern Station , annex to the Johannesburg Observ

#6 3318 Blixen

3318 Blixen , provisionally designated 1985 HB , is a stony Eoan asteroid from the outer region of the asteroid belt , approximately 23 kilometers in diameter. It was discovered by Danish astronomers Poul Jensen and Karl Augustesen at Brorfelde Observatory on 23 April 1985. [5] 3318 Blixen Discovery

#7 Ceres (dwarf planet)

Ceres ( / ˈ s ɪər iː z / ; [17] minor-planet designation : 1 Ceres ) is a dwarf planet in the asteroid belt between the orbits of Mars and Jupiter . It was the first asteroid discovered, on 1 January 1801, by Giuseppe Piazzi at Palermo Astronomical Observatory in Sicily, and announced as a new plane

#8 2014 HQ124

2014 HQ 124 is a sub-kilometer asteroid , classified as near-Earth object and potentially hazardous asteroid of the Aten group , approximately 400 meters (1,300 feet) in diameter. It passed 3.25   lunar distances (LD) from Earth on 8 June 2014. [8] It was discovered on 23 April 2014 by NEOWISE . [2]

#9 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

#10 1267 Geertruida

1267 Geertruida , provisional designation 1930 HD , is a carbonaceous background asteroid from the inner regions of the asteroid belt , approximately 20 kilometers in diameter. Discovered by astronomer Hendrik van Gent at Johannesburg Observatory in 1930, the asteroid was later named after Geertruid

#11 1651 Behrens

1651 Behrens , provisional designation 1936 HD , is a stony Florian asteroid from the inner regions of the asteroid belt , approximately 10 kilometers in diameter. Discovered by Marguerite Laugier in 1936, it was named after Johann Behrens . 1651 Behrens Discovery [1] Discovered   by M. Laugier Disc


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Book / Book


#1 A Passage to Infinity

A Passage to Infinity   : Medieval Indian Mathematics from Kerala and Its Impact [1] is a book by George Gheverghese Joseph chronicling the social and mathematical origins of the Kerala school of astronomy and mathematics . The book discusses the highlights of the achievements of Kerala school and a


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Comet / Comet


#1 82P/Gehrels

82P/Gehrels is a periodic comet that was discovered on October 27, 1975, by Tom Gehrels at the Palomar Mountain Observatory in California having a faint nuclear brightness of magnitude 17. [1] Periodic comet with 8 year orbit 82P/Gehrels Discovery Discovered by Tom Gehrels Discovery date October 27,

#2 Comet Hyakutake

Comet Hyakutake ( Japanese pronunciation:   [çakɯ̥take] , formally designated C/1996   B2 ) is a comet , discovered on 31 January 1996, [1] that passed very close to Earth in March of that year. It was dubbed the Great Comet of 1996 ; its passage near the Earth was one of the closest cometary approa

#3 113P/Spitaler

Comet Spitaler is a periodic comet in the Solar System discovered by Rudolf Ferdinand Spitaler ( Vienna , Austria) on November 17, 1890, while attempting to observe Comet Zona (C/1890 V1). Periodic comet with 7 year orbit 113P/Spitaler Discovery Discovered by Rudolf Ferdinand Spitaler Discovery date

#4 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

#5 143P/Kowal–Mrkos

143P/Kowal–Mrkos is a periodic comet in the Solar System . Periodic comet with 9 year orbit 143P/Kowal–Mrkos Discovery Discovered by Charles T. Kowal Antonín Mrkos Discovery date April 23, 1984 Alternative designations 1984 JD; 1984 X; 2000 ET90 Orbital characteristics A Epoch March 6, 2006 Aphelion

#6 Comet Yi–SWAN

Comet C/2009 F6 (Yi–SWAN) is a non-periodic comet which appeared in March 2009. C/2009 F6 (Yi–SWAN) Discovery Discovered by Dae-am Yi, SWAN instrument on SOHO spacecraft Discovery date March 26, 2009 Orbital characteristics A Epoch 2009-May-22 Aphelion 904 AU [1] Perihelion 1.274072 AU Semi-major ax

#7 26P/Grigg–Skjellerup

Comet Grigg–Skjellerup (formally designated 26P/Grigg–Skjellerup ) is a periodic comet . It was visited by the Giotto probe in July 1992. [5] The spacecraft came as close as 200   km, but could not take pictures because some instruments were damaged from its encounter with Halley's Comet . [6] Perio

#8 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


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Institution / Institution


#1 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

#2 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

#3 Steward Observatory

Steward Observatory is the research arm of the Department of Astronomy at the University of Arizona (UArizona). Its offices are located on the UArizona campus in Tucson , Arizona (US). Established in 1916, the first telescope and building were formally dedicated on April 23, 1923. It now operates, o

#4 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

#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 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

#8 Murchison Widefield Array

The Murchison Widefield Array ( MWA ) is a joint project between an international consortium of organisations to construct and operate a low-frequency radio array . 'Widefield' refers to its very large field of view (on the order of 30 degrees across). Operating in the frequency range 70–300   MHz,


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Meteorite / Meteorite


#1 Braunschweig meteorite

The Braunschweig meteorite is a 1.3 kilograms (2.9 pounds) meteorite that hit Melverode, a suburb in Braunschweig , Germany , at around 2:05 AM on April 23, 2013. It hit the concrete pavement in front of the home of Erhard Seemann, breaking into hundreds of fragments on impact, the largest of which


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Researcher / Researcher


#1 Knut Lundmark

Knut Emil Lundmark (14 June 1889 in Älvsbyn , Sweden – 23 April 1958 in Lund , Sweden), was a Swedish astronomer , professor of astronomy and head of the observatory at Lund University from 1929 to 1955. Swedish astronomer Knut Lundmark Knut Lundmark as student in 1908 Born ( 1889-06-14 ) 14 June 18

#2 Hendrik van Gent

Hendrik van Gent (14 September 1899, Pernis – March 29, 1947, Amsterdam ) [2] was a Dutch astronomer . Dutch astronomer (1899–1947) In this Dutch name , the surname is van Gent , not Gent . Asteroids discovered: 39   [1] see §   List of discovered minor planets He moved to South Africa in 1928 in or

#3 Edward Joshua Cooper

Edward Joshua Cooper (May 1798 – 23 April 1863) [1] was an Irish landowner, politician and astronomer from Markree Castle in County Sligo . He sat in the House of Commons of the United Kingdom from 1830 to 1841 and from 1857 to 1859, but is best known for his astronomy, and as the creator of Markree

#4 Walter Ferreri

Walter Ferreri (born 1948), originally from Buddusò in Sardinia, is an astronomer at the Italian Osservatorio Astronomico di Torino , science writer and discoverer of minor planets. Minor planets discovered: 15   [1] 3625 Fracastoro 27 April 1984 list 3778 Regge 26 April 1984 list 4061 Martelli 19 M

#5 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

#6 Paul G. Comba

Paul G. Comba (1926 – April 5, 2017) was an Italian-American computer scientist , an amateur astronomer and a prolific discoverer of minor planets . [2] Paul G. Comba Born 1926   ( 1926 ) Tunisia Died April 4, 2017 (2017-04-04) (aged   90–91) Education Ph.D. Alma   mater University of Turin , Blufft

#7 Andrew Lawrence (astronomer)

Andrew Lawrence FRSE is a British astrophysicist (born 23 April 1954 [1] ). He is Regius Professor of Astronomy at the University of Edinburgh based at the Royal Observatory, Edinburgh . [2] British astrophysicist Andrew Lawrence FRSE Andy Lawrence (center) with Roger Davies (left) and Stephen Warre

#8 Freimut Börngen

Freimut Börngen ( German: [ˈfʁaɪmuːt ˈbœʁŋən] ; 17 October 1930 – 19 June 2021) was a German astronomer and a prolific discoverer of minor planets . [2] A few sources give his first name wrongly as "Freimuth". The Minor Planet Center credits him as F. Borngen . German astronomer (1930–2021) Minor pl

#9 George Smoot

George Fitzgerald Smoot III (born February 20, 1945) is an American astrophysicist , cosmologist , Nobel laureate, and the 2nd contestant to win the $1 million prize on Are You Smarter than a 5th Grader? . He won the Nobel Prize in Physics in 2006 for his work on the Cosmic Background Explorer with

#10 Antonín Mrkos

Antonín Mrkos ( Czech pronunciation: [ˈantoɲiːn ˈmr̩kos] ) (27 January 1918, Střemchoví – 29 May 1996, Prague ) was a Czech astronomer . Czech astronomer Antonín Mrkos Minor planets discovered: 274   [1] see §   List of discovered minor planets

#11 Chriet Titulaer

Chriet Titulaer (May 9, 1943 – April 23, 2017), born in Hout-Blerick , Venlo , Limburg , was a Dutch astronomer, television presenter and popular science and technology writer. He lived in Houten , Utrecht . Chriet Titulaer Born ( 1943-05-09 ) May 9, 1943 Venlo , Netherlands Died 23 April 2017 (2017

#12 Krisztián Sárneczky

Krisztián Sárneczky (born 6 November 1974 in Budapest ) is a Hungarian teacher of geography [1] and prolific discoverer of minor planets and supernovae , researching at Konkoly Observatory in Budapest, Hungary. He is a board member of the Hungarian Astronomical Association (HAA) [2] and member of th

#13 Jana Tichá

Jana Tichá (born 1965 in České Budějovice ) is a Czech astronomer and discoverer of minor planets . She studied at the University of Economics in Prague and graduated in 1987. In 1992 she was selected for the position of a director of the Kleť Observatory . Czech astronomer Jana Tichá with her ex-hu

#14 Marguerite Laugier

Marguerite Laugier (née Lhomme ) (12 September 1896 – 10 June 1976) was a French astronomer active at the Nice Observatory from the 1930s to the 1950s. [2] Contemporary astronomical articles refer to her as "Madame Laugier". [ citation needed ] French astronomer Asteroids discovered: 21   [1] 1247 M

#15 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

#16 Alan C. Gilmore

Alan Charles Gilmore (born 1944 in Greymouth , New Zealand ) is a New Zealand astronomer and a discoverer of minor planets and other astronomical objects . [2] [3] New Zealand astronomer For other people of a similar name, see Alan Gilmour (disambiguation) . Asteroids discovered: 42   [1] see §   Li

#17 Johann Georg Liebknecht

Johann Georg Liebknecht (23 April 1679 in Wasungen , Thuringia – 17 September 1749 in Giessen ) was a German theologian and scientist. He was professor of mathematics and theology at the Ludoviciana (University) in Giessen, Germany. Johann Georg Liebknecht German theologian and scientist This articl

#18 William Rowan Hamilton

Sir William Rowan Hamilton LL.D , DCL , MRIA , FRAS (3/4 August 1805 – 2 September 1865) [1] [2] was an Irish mathematician, astronomer, and physicist. He was the Andrews Professor of Astronomy at Trinity College Dublin , and a director at Dunsink Observatory . Irish mathematician and astronomer (18

#19 Dmitry Dmitrievich Maksutov

Dmitry Dmitrievich Maksutov ( Russian : Дми́трий Дми́триевич Максу́тов ) ( 23 April   [ O.S. 11 April ]   1896 – 12 August 1964) was a Russian / Soviet optical engineer and amateur astronomer . He is best known as the inventor of the Maksutov telescope . In this name that follows Eastern Slavic nami

#20 Stephen Carkeek

Stephen James Carkeek (12 April 1815 – 27 November 1878) was a New Zealand civil servant, the colony's first Inspector of Customs, and the builder of the oldest-surviving observatory in the country. Stephen Carkeek Carkeek in about 1865 Born Stephen James Carkeek ( 1815-04-12 ) 12 April 1815 Swansea


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Star / Star


#1 Westerlund 2

Westerlund 2 is an obscured compact young star cluster (perhaps even a super star cluster [2] ) in the Milky Way , with an estimated age of about one or two million years. It contains some of the hottest, brightest, and most massive stars known. The cluster resides inside a stellar breeding ground k

#2 SN 1054

SN 1054 is a supernova that was first observed on c.   4 July 1054, and remained visible until c.   6 April 1056. [2] α Supernova in the constellation Taurus; visible from 1054 to 1056 SN 1054 Giant picture mosaic of the Crab Nebula , the remnants of SN 1054, taken by the Hubble Space Telescope in v

#3 DG Canum Venaticorum

DG Canum Venaticorum is a variable binary star system [3] in the northern constellation of Canes Venatici . As of 2009, the pair have an angular separation of 0.20 ″ along a position angle of 285°, which corresponds to a physical separation of around 3.6   AU . [8] With an apparent visual magnitude

#4 Mizar and Alcor

Mizar and Alcor are two stars forming a naked eye double in the handle of the Big Dipper (or Plough) asterism in the constellation of Ursa Major . Mizar is the second star from the end of the Big Dipper's handle, and Alcor its fainter companion. The traditional name Mizar derives from the Arabic الم


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