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langs: 4 апреля [ru] / april 4 [en] / 4. april [de] / 4 avril [fr] / 4 aprile [it] / 4 de abril [es]

days: april 1 / april 2 / april 3 / april 4 / april 5 / april 6 / april 7

Asteroid / Asteroid


#1 6793 Palazzolo

6793 Palazzolo , provisional designation 1991 YE , is a stony asteroid from the middle region of the asteroid belt , approximately 9 kilometers in diameter. It was discovered on 30 December 1991, by Italian amateur astronomers Ulisse Quadri and Luca Strabla at the Bassano Bresciano Observatory in no

#2 2020 CD3

2020 CD 3 (also 2020CD3 or CD3 for short) [11] [12] is a tiny near-Earth asteroid (or minimoon ) that ordinarily orbits the Sun but makes close approaches to the Earth–Moon system, in which it can temporarily enter Earth orbit through temporary satellite capture (TSC). It was discovered at the Mount

#3 734 Benda

734 Benda ( prov. designation : A912 TF or 1912 PH ) is a large background asteroid from the outer regions of the asteroid belt , approximately 70 kilometers (43 miles) in diameter. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 11 October 1912. [1] For its size,

#4 2019 XS

2019 XS is a small Apollo near-Earth asteroid discovered on 2 December 2019 by the Mount Lemmon Survey in Arizona , United States . [2] It passed 1.493 lunar distances (574,000   km; 357,000   mi) from Earth on 9 November 2021 at 03:48 UTC , after which observations were checked by the International

#5 (432949) 2012 HH2

(432949) 2012 HH 2 is a resonant trans-Neptunian object , approximately 255 kilometers (160 miles) in diameter, located in the outermost region of the Solar System . [3] It was discovered by Slovak astronomer Tomáš Vorobjov from images taken on the night of 19 April 2012, at the Astronomical Researc

#6 5641 McCleese

5641 McCleese , provisional designation 1990 DJ , is a rare-type Hungaria asteroid and slow rotator , classified as Mars-crosser from the innermost regions of the asteroid belt , approximately 4 kilometers in diameter. "McCleese" redirects here. Not to be confused with Cleese or McLeese . 5641 McCle

#7 53 Kalypso

Kalypso ( minor planet designation : 53 Kalypso ) is a large and very dark main belt asteroid that was discovered by German astronomer Robert Luther on April 4, 1858, at Düsseldorf . [1] It is named after Calypso , a sea nymph in Greek mythology , a name it shares with Calypso , a moon of Saturn . M

#8 5474 Gingasen

5474 Gingasen , provisional designation 1988 XE 1 , is a Vestian asteroid and suspected binary system [4] from the inner regions of the asteroid belt , approximately 6 kilometers in diameter. Asteroid 5474 Gingasen Discovery   [1] Discovered   by T. Fujii K. Watanabe Discovery   site Kitami Obs. Dis

#9 788 Hohensteina

788 Hohensteina is a main-belt asteroid discovered on 4 April 1914 by Franz Kaiser at Heidelberg-Königstuhl State Observatory . [1] Named for castle Hohenstein located in the Taunus mountains. [8] 788 Hohensteina Discovery   [1] Discovered   by Franz Kaiser Discovery   site Heidelberg-Königstuhl Sta

#10 1798 Watts

1798 Watts , provisional designation 1949 GC , is a stony asteroid and binary system from the inner regions of the asteroid belt , approximately 7 kilometers in diameter. 1798 Watts Discovery [1] Discovered   by Indiana University ( Indiana Asteroid Program ) Discovery   site Goethe Link Obs. Discov

#11 6615 Plutarchos

6615 Plutarchos , provisional designation 9512 P-L , is a Florian asteroid and suspected binary from the inner regions of the asteroid belt , approximately 3.1 kilometers in diameter. Discovered during the Palomar–Leiden survey in 1960, the asteroid was later named after the Greek philosopher Plutar

#12 (612911) 2004 XR190

(612911) 2004 XR 190 , nicknamed Buffy , is a trans-Neptunian object , classified as both a scattered disc object and a detached object , located in the outermost region of the Solar System . It was first observed on 11 December 2004, by astronomers with the Canada–France Ecliptic Plane Survey at th

#13 813 Baumeia

813 Baumeia ( prov. designation : A915 WJ or 1915 YR ) is a stony background asteroid from the inner regions of the asteroid belt . It was discovered on 28 November 1915, by German astronomer Max Wolf at the Heidelberg Observatory in southwest Germany. [1] The common S-type asteroid has a rotation p

#14 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

#15 1995 GJ

1995 GJ might be a trans-Neptunian object and/or high-inclination cubewano from the Kuiper belt in the outermost region of the Solar System , and based on the calculated distance and brightness is assumed to be approximately 175 kilometers (110 miles) in diameter. It is a lost minor planet that has

#16 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

#17 5692 Shirao

5692 Shirao , provisional designation 1992 FR , is a stony Eunomia asteroid from the middle region of the asteroid belt , approximately 9 kilometers in diameter. It was discovered on 23 March 1992, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at Kitami Observatory , Hokkaidō, Japan

#18 99942 Apophis

99942 Apophis is a near-Earth asteroid and potentially hazardous asteroid with a diameter of 370 metres (1,210 feet) that caused a brief period of concern in December 2004 when initial observations indicated a probability up to 2.7% that it would hit Earth on April   13, 2029. Additional observation


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Comet / Comet


#1 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

#2 Comet Bennett

Comet Bennett , formally known as C/1969 Y1 (old style 1970 II and 1969i ), was one of two comets to pass earth in the 1970s, along with Comet West . The name is also borne by an altogether different comet, C/1974 V2 . Discovered by John Caister Bennett on December 28, 1969 while still almost two AU

#3 96P/Machholz

Comet 96P/Machholz or 96P/Machholz 1 [3] is a short-period sungrazing comet discovered on May 12, 1986, by amateur astronomer Donald Machholz on Loma Prieta peak, in central California using 130 millimetres (5.1   in) binoculars. [3] [4] On June 6, 1986, 96P/Machholz passed 0.40373   AU (60,397,000

#4 C/2015 ER61 (PanSTARRS)

C/ 2015 ER 61 (PanSTARRS) is a comet , inner Oort cloud object. When classified as a minor planet, it had the fourth-largest aphelion of any known minor planet in the Solar System, after 2005 VX 3 , 2012 DR 30 , and 2013 BL 76 . It additionally had the most eccentric orbit of any known minor planet,

#5 C/2015 F5 (SWAN-XingMing)

Comet C/2015 F5 (SWAN-XingMing) was discovered on March 29, 2015 in near real time SWAN images of the SOHO spacecraft , by Szymon Liwo and Worachate Boonplod. It was also independently discovered on April 4, 2015 by Guoyou Sun and Gao Xing at the Xingming Observatory ( C42 ) near Ürümqi , China. [1]

#6 Comet McNaught–Russell

Comet C/1993 Y1 (McNaught–Russell) is a long (time) period comet that reached a maximum magnitude of 6.5 (just below naked eye level) in early 1994. It was discovered by Robert H. McNaught and Kenneth S. Russell using the U.K. Schmidt Telescope in Australia. McNaught and Russell worked at Siding Spr

#7 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


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Galaxy / Galaxy


#1 NGC 4753

NGC 4753 is a lenticular galaxy located about 60 million light-years away [2] in the constellation of Virgo . [3] NGC 4753 was discovered by astronomer William Herschel on February 22, 1784. [4] It is notable for having distinct dust lanes that surround its nucleus. [5] It is a member of the NGC 475


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Institution / Institution


#1 Archenhold Observatory

The Archenhold Observatory ( German : Archenhold-Sternwarte ) was named in honour of Friedrich Simon Archenhold , is an observatory in Berlin-Treptow . It houses the Großer Refraktor (Great Refractor), which is the longest pointable telescope in the world. It is also called the Himmelskanone (Celest

#2 Observatory of the rue Serpente

The Observatory of the rue Serpente was an astronomical observatory owned and operated by the Société Astronomique de France (the French Astronomical Society) in the historic Latin Quarter of Paris . It operated between 1890 until 1968, when it was transferred to a new location at the nearby Astrono

#3 W. M. Keck Observatory

The W. M. Keck Observatory is a two-telescope astronomical observatory at an elevation of 4,145 meters (13,600   ft) near the summit of Mauna Kea in the U.S. state of Hawaii . Both telescopes have 10   m (33   ft) aperture primary mirrors, and when completed in 1993 (Keck 1) and 1996 (Keck 2) were t

#4 Square Kilometre Array

The Square Kilometre Array ( SKA ) is an intergovernmental radio telescope project being planned to be built in Australia (low-frequency) and South Africa (mid-frequency). The combining infrastructure, the Square Kilometre Array Observatory (SKAO) is located in the United Kingdom . Conceived in the

#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 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

#7 Pistoia Mountains Astronomical Observatory

The Pistoia Mountains Astronomical Observatory ( Italian : Osservatorio Astronomico della Montagna Pistoiese ; obs. code : 104 ), also known as the San Marcello Observatory and the Pian dei Termini Observatory ( Italian : Osservatorio di Pian dei Termini ), is an astronomical observatory in San Marc

#8 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

#9 Royal Observatory of Belgium

The Royal Observatory of Belgium ( French: Observatoire Royal de Belgique , Dutch : Koninklijke Sterrenwacht van België ), has been situated in the Uccle municipality of Brussels ( Belgium ) since 1890. It was first established in Saint-Josse-ten-Noode in 1826 by William I under the impulse of Adolp

#10 Old University of Alabama Observatory

The Old University of Alabama Observatory , now known as Frederick R. Maxwell Hall , was an astronomical observatory owned and operated by the University of Alabama in Tuscaloosa, Alabama . Although no longer used as an observatory, the building has been restored and preserved. It currently houses t

#11 Société astronomique de France

The Société astronomique de France ( SAF ; French:   [sɔsiete astʁɔnɔmik də fʁɑ̃s] ), the French astronomical society, is a non-profit association in the public interest organized under French law ( Association loi de 1901 ). Founded by astronomer Camille Flammarion in 1887, its purpose is to promot

#12 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) .


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Meteorite / Meteorite


#1 HD 28185 b

HD 28185 b is an extrasolar planet 128 light-years away from Earth in the constellation of Eridanus . The planet was discovered orbiting the Sun-like star HD 28185 in April 2001 as a part of the CORALIE survey for southern extrasolar planets, and its existence was independently confirmed by the Mage

#2 HD 8574 b

HD 8574 b is an extrasolar planet discovered in 2001 by a team of European astronomers using Doppler spectroscopy as part of the ELODIE Planet Search Survey , and was published in a paper with five other planets. HD 8574 b is in the orbit of host star HD 8574 . The planet is at most two times the ma

#3 HD 12661 b

HD 12661 b is a giant exoplanet two and a half times the mass of Jupiter orbiting around the star HD 12661 . [1] Extrasolar planet in the constellation Aries HD 12661 b The exoplanet HD 12661 b (min mass ~2.3 MJ) as rendered by Celestia Discovery Discovered   by Fischer et al. Discovery   site Calif

#4 HD 80606 b

HD 80606 b (also Struve 1341 B b or HIP 45982 b ) is an eccentric and hot Jupiter 190 light-years from the Sun in the constellation of Ursa Major . HD 80606 b was discovered orbiting the star HD 80606 in April 2001 by a team led by Michel Mayor and Didier Queloz . [1] With a mass 4 times that of Jup

#5 HD 213240 b

HD 213240 b is an extrasolar planet located approximately 133 light-years (41 parsecs ) from the Solar System in the constellation of Grus . It is a gas giant orbiting the G-type star HD 213240 . [2] Extrasolar planet in the constellation Grus HD 213240 b Discovery Discovered   by Santos et al. [1]

#6 HD 106252 b

HD 106252 b is a large gas giant extrasolar planet about 10 times more massive than Jupiter . It was announced in 2001 by the European Southern Observatory . [1] The discovery was confirmed by a different team using the Lick Telescope . [4] HD 106252 b Discovery Discovered   by Geneva Extrasolar Pla

#7 HD 178911 Bb

HD 178911 Bb is a planet discovered in 2001 [2] by Zucker who used the radial velocity method . The minimum mass of this giant planet is 7.35 times that of Jupiter that orbits close to the star. The period of the planet is 71.5 days and the semi- amplitude is 346.9   m/s. HD 178911 Bb Discovery Disc

#8 HD 50554 b

HD 50554 b is a Jupiter-sized extrasolar planet with minimum mass 4.4 times that of Jupiter . The planet was announced in 2001 by the European Southern Observatory and confirmed in 2002 using observations from the Lick and Keck telescopes. [1] [3] Extrasolar planet in the constellation Gemini HD 505

#9 AB Aurigae b

AB Aurigae b (or AB Aur b) [1] is a directly imaged protoplanet embedded within the protoplanetary disk of the young, Herbig AeBe star AB Aurigae . The system is about 508 light-years away: AB Aur b is located at a projected separation of about 93 AU from its host star. AB Aur b is the first confirm

#10 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 Liisi Oterma

Liisi Oterma ( Finnish pronunciation:   [ˈliːsi ˈʔotermɑ] ; 6 January 1915 – 4 April 2001) was a Finnish astronomer , the first woman to get a Ph.D. degree in astronomy in Finland. [1] Finnish astronomer Liisi Oterma Born January 6, 1915 Turku Died April 4, 2001 Turku Scientific career Fields Astron

#2 Erik Prosperin

Erik Prosperin (25 July 1739 – 4 April 1803) was a Swedish astronomer . Swedish astronomer Prosperin was a lecturer in mathematics and physics at Uppsala University in 1767, professor of observational astronomy (Observator) in 1773 – 1796, and professor of Astronomy in 1797 – 1798. He became a membe

#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 Snježana Kordić

Snježana Kordić ( pronounced   [sɲěʒana kôːrditɕ] ( listen ) ; born 29 October 1964) [1] is a Croatian linguist . [3] In addition to her work in syntax , she has written on sociolinguistics . [2] Kordić is known among non-specialists for numerous articles against the puristic and prescriptive langua

#5 Robert Luther

Karl Theodor Robert Luther (April 16, 1822, Świdnica – February 15, 1900 Düsseldorf ), normally published as Robert Luther , was a German astronomer . While working at the Bilk Observatory in Düsseldorf, Germany, he searched for asteroids and discovered 24 of them between 1852 and 1890. [1] [2] Seve

#6 Agop Terzan

Agop Terzan (born Terziyan) (October 31, 1927 – April 4, 2020) was a Turkish - Armenian astronomer. Born in Constantinople Istanbul , he finished his high school from Getronagan Armenian High School , after he received his Bachelor's Degree in Mathematical and Astronomical Science in 1945 and Master

#7 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

#8 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

#9 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

#10 Stuart Pottasch

Stuart Pottasch (16 January 1932 – 4 April 2018) was a professor at the University of Groningen and a researcher of planetary nebulae . Stuart Pottasch Born 16 January 1932   New York City   Died 4 April 2018   (aged 86) Groningen   Alma   mater Cornell University Harvard University University of Co

#11 John V. McClusky

John V. McClusky is an American astronomer . He is a prolific discoverer of asteroids . [2] American astronomer Minor planets discovered: 156   [1] see §   List of discovered minor planets

#12 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

#13 Thomas John Hussey

Thomas John Hussey (4 April 1792 – c. 1866) was an English clergyman and astronomer . English clergyman and astronomer Thomas John Hussey, D.D. Born ( 1792-04-04 ) 4 April 1792 Lamberhurst , Kent Nationality British Education Eton Trinity College, Dublin Known   for Predicting the existence of Neptu

#14 Erich Meyer

Erich Meyer (born August 6, 1951) is an Austrian engineer , amateur astronomer and discoverer of asteroids . Austrian engineer and amateur astronomer Minor planets discovered: 22   [1] see §   List of discovered minor planets

#15 Erwin Obermair

Erwin Obermair (29 August 1946 in Hargelsberg – 15 January 2017 in Linz [2] ) was an Austrian amateur astronomer and co-discoverer of asteroids . Austrian astronomer Minor planets discovered: 7   [1] 14057 Manfredstoll 15 January 1996 [1] MPC 15949 Rhaeticus 17 January 1998 [1] MPC 43955 Fixlmüller

#16 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

#17 Scott Forbush

Scott Ellsworth Forbush (April 10, 1904 – April 4, 1984) was an American astronomer , physicist and geophysicist who is recognized as having laid the observational foundations for many of the central features of solar-interplanetary-terrestrial physics , which at the time was an underdeveloped field

#18 Franck Marchis

Franck Marchis (born April 6, 1973 in Caen , France), astronomer and planetary scientist , is best known for his discovery and characterization of multiple asteroids, his study of Io volcanism and imaging of exoplanets, planets around other stars. American astronomer This article includes a list of

#19 Maimonides

Moses ben Maimon [lower-alpha 1] (1138–1204), commonly known as Maimonides ( / m aɪ ˈ m ɒ n ɪ d iː z / ) [lower-alpha 2] and also referred to by the acronym Rambam ( Hebrew : רמב״ם ), [lower-alpha 3] was a medieval Sephardic Jewish philosopher who became one of the most prolific and influential Tora

#20 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


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Star / Star


#1 Iota1 Librae

Iota 1 Librae , Latinized from ι 1 Librae , is a quadruple [3] star system in the constellation Libra . Its apparent magnitude is 4.54. It is located 379 light years from earth. [6] Multiple star system in the constellation Libra Iota 1 Librae Map of the constellation of Libra. Observation data Epoc

#2 HD 80606 and HD 80607

HD 80606 and HD 80607 are two stars comprising a binary star system. They are approximately 217 light-years away in the constellation of Ursa Major . Both stars orbit each other at an average distance of 1,200 astronomical units . The binary system is listed as Σ1341 in the Struve Catalogue of Doubl

#3 Delta Eridani

Delta Eridani , which is Latinized from δ Eridani, is a star in the equatorial constellation of Eridanus . Star in the constellation Eridanus δ Eridani Location of δ Eridani (circled) Observation data Epoch J2000             Equinox J2000 Constellation Eridanus Right ascension 03 h 43 m 14.90088 s [


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