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- J band (infrared)In infrared astronomy, the J band refers to an atmospheric transmission window (1.1 to 1.4
- J. Mayo GreenbergAmerican-Dutch astrochemist
- Jack G. HillsAmerican astronomer and mathematician
- Jacobi ellipsoidShape taken by a self-gravitating fluid body rotating at constant velocity
- Jacques BlamontFrench astrophysicist (1926–2020)
- Jacques CassiniFrench astronomer (1677–1756)
- James B. KalerJames Bailey "Jim" Kaler (December 29, 1938 — November 26, 2022) was an American astronome
- James BinneyBritish astronomer (born 1950)
- James BradleyEnglish astronomer (1692–1762)
- James Clerk Maxwell TelescopeThe James Clerk Maxwell Telescope (JCMT) is a submillimetre-wavelength radio telescope at
- James E. LarkinAmerican astrophysicist and academic
- James Edward KeelerJames Edward Keeler (September 10, 1857 – August 12, 1900) was an American astronomer. He
- James Ferguson (Scottish astronomer)James Ferguson (25 April 1710 – 17 November 1776) was a Scottish astronomer. He is known a
- James Gunn (astronomer)American astronomer
- James HoughBritish physicist
- James L. ElliotJames Ludlow Elliot (June 17, 1943 – March 3, 2011) was an American astronomer and scienti
- James R. GrahamIrish astrophysicist
- Jana TicháCzech astronomer
- Japan Spaceguard AssociationThe Japan Spaceguard Association (日本スペースガード協会, nihon supēsugādo kyōkai, abbreviated JSGA)
- Jean BoslerFrench astronomer and author
- Jean DelhayeFrench astronomer
- Jean FocasGreek-French astronomer (1909–1969)
- Jean KovalevskyJean Kovalevsky (May 18, 1929 – August 17, 2018) was a French astronomer, specializing in
- Jean MuellerAmerican astronomer
- Jean Sylvain BaillyFrench astronomer, mathematician, freemason, and political leader (1736–1793)
- Jean-Charles HouzeauBelgian astronomer and journalist
- Jean-François DenisseFrench astronomer (1915–2014)
- Jean-Louis PonsJean-Louis Pons (24 December 1761 – 14 October 1831) was a French astronomer. Despite humb
- Jeans instabilityStar formation process
- Jeremiah HorrocksEnglish astronomer (1618–1641)
- Jerry Nelson (astronomer)American astronomer (1944–2017)
- Jesse L. GreensteinJesse Leonard Greenstein (October 15, 1909 – October 21, 2002) was an American astronomer.
- Jessica MinkJessica Mink (formerly Douglas John Mink) is an American software developer and a data arc
- Jessica T. DempseyAustralian radio astronomer
- Jewish astrologyJewish astrology (Hebrew: מַזָּלוֹת, romanized: mazzālôt, lit. 'constellations') is the sy
- João Faras15th/16th-century Portuguese astronomer and physician
- Joel StebbinsJoel Stebbins (July 30, 1878 – March 16, 1966) was an American astronomer who pioneered ph
- Johann BayerGerman lawyer and uranographer
- Johann Elert BodeGerman astronomer (1747–1826)
- Johann Franz EnckeGerman astronomer (1791–1865)
- Johannes FabriciusGerman astronomer
- John August AndersonAmerican astronomer
- John Brinkley (astronomer)Irish bishop and astronomer (1763–1835)
- John Campbell BrownScottish astronomer (1947–2019)
- John Dobson (amateur astronomer)American amateur astronomer
- John E. BaldwinBritish astronomer
- John F. HawleyAmerican astrophysicist (1958–2021)
- John F. Kennedy Space Center MPSThe following buildings were added to the National Register of Historic Places as part of
- John Gatenby BoltonBritish-Australian astronomer (1922–1993)
- John HellinsBritish teacher and astronomer (c. 1749–1827)
- John HuchraJohn Peter Huchra ( HUK-rə; December 23, 1948 – October 8, 2010) was an American astronome
- John Louis Emil DreyerDanish-Irish astronomer (1852–1926)
- Joint Dark Energy MissionProposed space probe
- Jørgen Christensen-DalsgaardDanish astronomer (born 1950)
- José Luis Ortiz MorenoJosé Luis Ortiz Moreno (born 1967) is a Spanish astronomer, and former vice director of Te
- Julian dayDays since the beginning of the Julian Period
- Julian year (astronomy)Interval of exactly 365.25 Earth days
- Julie Hlavacek-LarrondoCanadian astrophysicist
- Julio Ángel FernándezUruguayan astronomer and teacher
- JupiterFifth planet from the Sun
- Jupiter analogueExoplanets similar to Jupiter
- Jupiter in fictionDepictions of the planet
- Jupiter radiusUnit of length in astronomy
- Jupiter trojanAsteroid sharing the orbit of Jupiter
- Jupiter's North PoleJupiter's North Pole is the northernmost point of Jupiter. Like Jupiter's South Pole, it h
- Jupiter's South Pole90°S 0°W / 90°S -0°E
