Fred Lawrence Whipple (November 5, 1906 – August 30, 2004) was an American

astronomer An astronomer is a scientist in the field of astronomy who focuses on a specific question or field outside the scope of Earth. Astronomers observe astronomical objects, such as stars, planets, natural satellite, moons, comets and galaxy, galax ...

, who worked at the

Harvard College Observatory The Harvard College Observatory (HCO) is an institution managing a complex of buildings and multiple instruments used for astronomical research by the Harvard University Department of Astronomy. It is located in Cambridge, Massachusetts, United St ...

for more than 70 years. Among his achievements were

asteroid An asteroid is a minor planet—an object larger than a meteoroid that is neither a planet nor an identified comet—that orbits within the Solar System#Inner Solar System, inner Solar System or is co-orbital with Jupiter (Trojan asteroids). As ...

and

comet A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. This produces an extended, gravitationally unbound atmosphere or Coma (cometary), coma surrounding ...

discoveries, the " dirty snowball" hypothesis of comets, and the invention of the Whipple shield.

Life

Whipple was born on November 5, 1906, in Red Oak, Iowa, as the son of a farmer. An early bout with

polio Poliomyelitis ( ), commonly shortened to polio, is an infectious disease caused by the poliovirus. Approximately 75% of cases are asymptomatic; mild symptoms which can occur include sore throat and fever; in a proportion of cases more severe ...

ended his ambition of being a professional

tennis Tennis is a List of racket sports, racket sport that is played either individually against a single opponent (singles (tennis), singles) or between two teams of two players each (doubles (tennis), doubles). Each player uses a tennis racket st ...

player. Whipple studied at Occidental College in

Southern California Southern California (commonly shortened to SoCal) is a geographic and Cultural area, cultural List of regions of California, region that generally comprises the southern portion of the U.S. state of California. Its densely populated coastal reg ...

, then majored in mathematics at the University of California at Los Angeles, graduating in 1927. Recollecting his path from mathematics to astronomy, Whipple stated in a 1978 autobiography that his "mathematics major veered imthrough physics and finally focused on astronomy where time, space, mathematics, and physics had a common meeting ground." After taking a class in astronomy, he enrolled at the

University of California, Berkeley The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California), is a Public university, public Land-grant university, land-grant research university in Berkeley, California, United States. Founded in 1868 and named after t ...

where he obtained his PhD in Astronomy in 1931. While in graduate school, he helped map the orbit of the then newly discovered

dwarf planet A dwarf planet is a small planetary-mass object that is in direct orbit around the Sun, massive enough to be hydrostatic equilibrium, gravitationally rounded, but insufficient to achieve clearing the neighbourhood, orbital dominance like the ...

Pluto Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of Trans-Neptunian object, bodies beyond the orbit of Neptune. It is the ninth-largest and tenth-most-massive known object to directly orbit the Su ...

. He joined

in 1931 and studied the trajectories of meteors, confirming that they originated within the

Solar System The Solar SystemCapitalization of the name varies. The International Astronomical Union, the authoritative body regarding astronomical nomenclature, specifies capitalizing the names of all individual astronomical objects but uses mixed "Sola ...

rather than from interstellar space. In 1933, he discovered the periodic

36P/Whipple and the

1252 Celestia. He also discovered or co-discovered five other non-periodic comets, the first of which was C/1932 P1 Peltier-Whipple, independently discovered by the famed amateur astronomer Leslie Peltier, while his last, and brighter, was C/1942 X1 (Whipple–Fedtke–Tevzadze). During

World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

, he invented a device for cutting

tinfoil Tin foil, also spelled tinfoil, is a thin foil (metal), foil made of tin. Tin foil was superseded after World War II by cheaper and more durable aluminium foil, which is still referred to as "tin foil" in many regions (an example of a misnomer). ...

into

chaff Chaff (; ) is dry, scale-like plant material such as the protective seed casings of cereal grains, the scale-like parts of flowers, or finely chopped straw. Chaff cannot be digested by humans, but it may be fed to livestock, ploughed into soil ...

, a radar countermeasure. He was awarded a

Certificate of Merit The Certificate of Merit Medal was a Awards and decorations of the United States military, military decoration of the United States Army that was issued between the years of 1905 and 1918. The Certificate of Merit Medal replaced the much older Cer ...

for this in 1948. He also invented a "meteoroid bumper" or " Whipple shield", which protects spacecraft from impact by small particles by breaking them up. From 1950 until 1977 he was a professor of Astronomy at

Harvard University Harvard University is a Private university, private Ivy League research university in Cambridge, Massachusetts, United States. Founded in 1636 and named for its first benefactor, the History of the Puritans in North America, Puritan clergyma ...

, including being the Phillips Professor of Astronomy between 1968 and 1977. During these years (in the early 1950s), he wrote a series of influential papers entitled ''A Comet Model'', published in ''

Astrophysical Journal ''The Astrophysical Journal'' (''ApJ'') is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler. The journal discontinued its print edition and ...

''. In these papers, he proposed the "icy conglomerate" hypothesis of

composition (later called the " dirty snowball" hypothesis). The basic features of this hypothesis were later confirmed; however, the exact amount (and thus the importance) of ices in a comet is an active field of research, with most of the recently obtained data pointing to a low contribution of ices to a comet's mass (dubbed the " icy dirtball" hypothesis). He also anticipated the era of

artificial satellite A satellite or an artificial satellite is an object, typically a spacecraft, placed into orbit around a celestial body. They have a variety of uses, including communication relay, weather forecasting, navigation ( GPS), broadcasting, scienti ...

s and organized the members of Operation Moonwatch to track them. These groups were the only ones in the US prepared and ready to make observations when the

Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

unexpectedly launched Sputnik I in 1957. He became director of the

Smithsonian Astrophysical Observatory The Smithsonian Astrophysical Observatory (SAO) is a research institute of the Smithsonian Institution, concentrating on Astrophysics, astrophysical studies including Galactic astronomy, galactic and extragalactic astronomy, cosmology, Sun, solar ...

when Loyal Blaine Aldrich retired in 1955, and remained in this post until 1973. Whipple made at least one media appearance, in the science documentary film ''Target...Earth?'' (1980). He also appeared in the BBC's coverage of the Giotto encounter with Halley's Comet, in 1986. Whipple died in 2004, aged 97.

Honors

* Elected to the

American Academy of Arts and Sciences The American Academy of Arts and Sciences (The Academy) is one of the oldest learned societies in the United States. It was founded in 1780 during the American Revolution by John Adams, John Hancock, James Bowdoin, Andrew Oliver, and other ...

(1941) * Elected to the

American Philosophical Society The American Philosophical Society (APS) is an American scholarly organization and learned society founded in 1743 in Philadelphia that promotes knowledge in the humanities and natural sciences through research, professional meetings, publicat ...

(1956) * Elected to the United States

National Academy of Sciences The National Academy of Sciences (NAS) is a United States nonprofit, NGO, non-governmental organization. NAS is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Academy of Engineering (NAE) and the ...

(1959)

Awards

President's Award for Distinguished Federal Civilian Service Established by President Dwight D. Eisenhower on 27 June 1957 by , the President's Award for Distinguished Federal Civilian Service was created to allow the President to recognize civilian officers or employees of the federal government who have ...

, by US President

John F. Kennedy John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), also known as JFK, was the 35th president of the United States, serving from 1961 until his assassination in 1963. He was the first Roman Catholic and youngest person elected p ...

(1963) *

Leonard Medal The Leonard Medal honors outstanding contributions to the science of meteoritics and closely allied fields. It is awarded by the Meteoritical Society The Meteoritical Society is a non-profit scholarly organization founded in 1933 to promote res ...

of the

Meteoritical Society The Meteoritical Society is a non-profit scholarly organization founded in 1933 to promote research and education in planetary science with emphasis on studies of meteorites and other extraterrestrial materials that further our understanding of th ...

(1970) *Golden Plate Award of the

American Academy of Achievement The American Academy of Achievement, colloquially known as the Academy of Achievement, is a nonprofit educational organization that recognizes some of the highest-achieving people in diverse fields and gives them the opportunity to meet one ano ...

(1981) *

Gold Medal of the Royal Astronomical Society The Gold Medal of the Royal Astronomical Society is the highest award given by the Royal Astronomical Society (RAS). The RAS Council have "complete freedom as to the grounds on which it is awarded" and it can be awarded for any reason. Past awar ...

(1983) *

Bruce Medal The Catherine Wolfe Bruce Gold Medal is awarded every year by the Astronomical Society of the Pacific for outstanding lifetime contributions to astronomy. It is named after Catherine Wolfe Bruce, an American patroness of astronomy, and was ...

of the Astronomical Society of the Pacific (1986) *

Henry Norris Russell Lectureship The Henry Norris Russell Lectureship is awarded each year by the American Astronomical Society in recognition of a lifetime of excellence in astronomical research. The idea for the lectureship came from then society President Harlow Shapley in 1945, ...

of the

American Astronomical Society The American Astronomical Society (AAS, sometimes spoken as "double-A-S") is an American society of professional astronomers and other interested individuals, headquartered in Washington, DC. The primary objective of the AAS is to promote the adv ...

(1987) * Whipple Award of the

American Geophysical Union The American Geophysical Union (AGU) is a 501(c)(3) nonprofit organization of Earth, Atmospheric science, atmospheric, Oceanography, ocean, Hydrology, hydrologic, Astronomy, space, and Planetary science, planetary scientists and enthusiasts that ...

(1990), namesake and first recipient

Namesakes

* Main-belt asteroid 1940 Whipple * Whipple Observatory on Mount Hopkins in

Arizona Arizona is a U.S. state, state in the Southwestern United States, Southwestern region of the United States, sharing the Four Corners region of the western United States with Colorado, New Mexico, and Utah. It also borders Nevada to the nort ...

* Whipple shield * Whipple House on Great Camanoe in the

British Virgin Islands The British Virgin Islands (BVI), officially the Virgin Islands, are a British Overseas Territories, British Overseas Territory in the Caribbean, to the east of Puerto Rico and the United States Virgin Islands, US Virgin Islands and north-west ...

(distinct from the

John Whipple House The John Whipple House is a historic colonial house at 1 South Green in Ipswich, Massachusetts. Built in the seventeenth century, the house has been open to the public as a museum since 1899 and was the subject of some of the earliest attempts ...

, in Ipswich, Massachusetts)

References

External links

*
Bruce Medal entry with picture

Report of his death (BBC)

Astronomy.com obituary

F. L. Whipple Oral History Interview
from the

Smithsonian Institution Archives Smithsonian Libraries and Archives is an institutional archives and library system comprising 21 branch libraries serving the various Smithsonian Institution museums and research centers. The Libraries and Archives serve Smithsonian Institution ...

George Field, "Fred Whipple", Biographical Memoirs of the National Academy of Sciences (2007)

Fred Lawrence Whipple Collection, The University of Alabama in Huntsville Archives and Special Collections
{{DEFAULTSORT:Whipple, Fred Lawrence 20th-century American astronomers Discoverers of asteroids Discoverers of comets Occidental College alumni American planetary scientists University of California, Los Angeles alumni UC Berkeley College of Letters and Science alumni Harvard University faculty 1906 births 2004 deaths Hugo Award–winning writers Recipients of the Gold Medal of the Royal Astronomical Society People from Belmont, Massachusetts People from Red Oak, Iowa Harvard College Observatory people Recipients of the President's Award for Distinguished Federal Civilian Service Scientists from Iowa Fellows of the American Geophysical Union Members of the United States National Academy of Sciences Members of the American Philosophical Society