astronomy

John Caister Bennett

John Caister Bennett is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand John Caister Bennett rather than just read about it. In short: John Caister "Jack" Bennett (born 6 April 1914 in Estcourt, Natal, died 30 May 1990 in Pretoria), was a South African civil servant and amateur astronomer. His mother was British and his father was from Tasmania.

Key takeaways

John Caister Bennett belongs to astronomy; place it in that map before memorising details.
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Reproduce the core statement of John Caister Bennett from memory before moving on to harder problems.

Reference excerpt

John Caister "Jack" Bennett (born 6 April 1914 in Estcourt, Natal, died 30 May 1990 in Pretoria), was a South African civil servant and amateur astronomer. His mother was British and his father was from Tasmania. He attended school in Ficksburg and began to work in public service after graduating in 1934, initially in the forestry administration in Elgin before moving to the administration of Transvaal Province in Pretoria. During World War II he served as a soldier in South Africa, Egypt and Italy. In 1974 he retired from the public service. From 1985 he began to suffer from arthritis and soon afterwards his health deteriorated so much that he had to sell his house in Pretoria's Riviera neighborhood and move into a nursing home. He died on 30 May 1990 at the age of 76.

Amateur astronomer Bennett's interest in astronomy began early when his mother showed him the starry sky with the Southern Cross and the planets on the way home from evening church visits and told him about her observation of Halley's Comet on its return in 1910. After the war he started looking for comets with a 60 mm refractor, and from 1958 he observed the new artificial satellites. For this purpose, he bought a light 125 mm refractor with an altazimuth mount in 1961, which later became his favorite instrument. He became a member of the Astronomical Society of Southern Africa and the British Astronomical Association at an early age. Although he discovered comets as early as the 1960s, he was either not the first discoverer, or the comets he found were short-lived and could not be observed again. During this time (1969 to 1974) he systematically compiled a catalog of 152 objects in the southern sky that could be mistaken for a comet. This list, later called the Bennett catalog, is still today a valuable aid for comet hunters, a "southern Messier catalog". Every year he spent some 150 hours looking for comets in the backyard of his house in Pretoria and by chance discovered on 16 July 1968 an unusual appearance in the galaxy Messier 83 (NGC 5236) in the constellation Hydra. This was recognized shortly afterwards by professional astronomers as a supernova (SN 1968L). Bennett was the first person to visually discover a supernova since the invention of the telescope. With his 125 mm refractor he finally discovered his first comet, C/1969 Y1 (Bennett), after a search for more than 333 hours on 28 December 1969. This became a "Great Comet" that could be seen with the naked eye the following year. His second comet discovery occurred on 13 November 1974 after a further 482 hours of search. This was the inconspicuous C/1974 V2 (Bennett). In later years he bought a Celestron C-8, but despite 30 to 40 hours of searching annually for the next 10 years, he had no further success in hunting comets, partially due to increasing light pollution. In addition to comets, he was also interested in meteors and variable stars. In the years before his death, he had to give up observing entirely and donated his famous 125 mm refractor to the University of South Africa.

Discoveries Supernova SN 1968L in the galaxy M83, 16 July 1968 C/1969 Y1, 28 December 1969 C/1974 V2, 13 November 1974

Honors 1968–1969: President of the Astronomical Society of Southern Africa (ASSA) 1968–1985: Director of the Comet & Meteor Section of ASSA 1970: ASSA's Gill Medal for achievements in astronomy with special consideration of achievements in South Africa 1971: Merlin Medal of the British Astronomical Association (BAA) 1974: Fellow of the Royal Astronomical Society 1975–1987: Director of ASSA's Nova Search Section 1976: Nova Award from the American Association of Variable Star Observers (AAVSO), Cambridge, Massachusetts, for his discovery of the supernova SN 1968L 1977: The new observatory and 32 cm telescope at ASSA's Pretoria Center are named for Jack Bennett 1986: Master of Science (h. C.) From Witwatersrand University 1989: Honorary member of the Astronomical Society of Southern Africa 1989: An asteroid discovered in 1986 in the main belt is given the official designation (4093) Bennett after John C. Bennett. After his death, the Pretoria Centre established the ASSA's annual Jack Bennett Award for contributions to astronomy and the Centre.

External links Publications by J.C. (Jack) Bennett in the Astrophysics Data System Obituaries for J.C. (Jack) Bennett in the Astrophysics Data System

References

Worked examples

Example 1 — a first encounter with John Caister Bennett

Start with the simplest possible case. Write down what John Caister Bennett claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to John Caister Bennett before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about John Caister Bennett ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of John Caister Bennett

In research: John Caister Bennett appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses John Caister Bennett in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: John Caister Bennett is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1914 births, 1990 deaths, 20th-century astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for John Caister Bennett outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study John Caister Bennett in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what John Caister Bennett means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain John Caister Bennett out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is John Caister Bennett in simple terms?

Why does John Caister Bennett matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study John Caister Bennett?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on John Caister Bennett.