HARVARD COLLEGE OBSERVATORY - 2 ea PostCards - Comet 66P/du Toit (1945f) HAC 734

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Seller: Top-Rated Seller poetryinpower ✉️ (4,975) 100%, Location: Pasadena, California, US, Ships to: US & many other countries, Item: 156110399871 HARVARD COLLEGE OBSERVATORY - 2 ea PostCards - Comet 66P/du Toit (1945f) HAC 734. HARVARD COLLEGE OBSERVATORY - 2 ea PostCards - Comet 66P/du Toit (1945f) HAC 734

HARVARD COLLEGE OBSERVATORY - 2 ea PostCards - Comet 66P/du Toit (1945f) HAC 734 POB#55896 TITLES: HAC 733 + HAC 734  Both concerning Comet du Toit. PUBLISHER: Cambridge, Mass.: Harvard College Observatory DATE: 1946PROVENANCE: Addressed to 22 year old student Richard Bateman, a combat veteran Army Air Corps bomber pilot studying astronomy at UC Berkeley. Bateman's long career included orbit determination for the Apollo manned missiones as well as the earliest Mariner missions to Mars. He used the card as a bookmark and was found in one of his many Celestial Mechanics books offered here. . The Harvard College Observatory Announcement Cards (HACs) served during 1926-1964 to announce information about astronomical phenomena requiring prompt dissemination -- particularly the discovery and follow-up of novae, supernovae, and comets -- specifically for astronomers in the western hemisphere. (The HACs effectively took over the function of the HCO Bulletins, which had been issued since 1898.) In 1964, it was agreed by the International Astronomical Union that its Central Bureau for Astronomical Telegrams would move to HCO (and be operated by the Smithsonian Astrophysical Observatory staff there), and the HACs ceased publication at the end of 1964, with its editorial staff converting to publish the IAUCs instead. . 66P/du Toit is a periodic comet in the Solar System with a current orbital period of 14.78 years.  It was discovered by Daniel du Toit at the Boyden Observatory, South Africa on 16 May 1944, who estimated its brightness at magnitude 10. Other observers estimated magnitude 11 and 12.5. Its next return date was calculated to have a perihelion date of 10 April 1959 but it was not discovered. The 1974 return was found almost accidentally with a perihelion date of 1 April 1974 and a brightness of magnitude 18-19. The 1989 appearance was again missed. The 2003 appearance had a perihelion date of 27 August 2003 and a brightness of magnitude 20.[4]
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  • Condition: Gently Used.
  • Author: Harvard College Observatory
  • Binding: Loose Pages, Articles
  • Language: English
  • Original/Facsimile: Original
  • Place of Publication: Cambridge, Mass.
  • Publisher: Harvard College Observatory
  • Subject: Science & Medicine
  • Topic: Astronomy
  • Year Printed: 1946

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