Zobrazeno 1 - 4
of 4
pro vyhledávání: '"Calderwood, Tom"'
Autor:
Nickel, Otmar, Calderwood, Tom
Publikováno v:
J. Amer. Assoc. Var. Star Obs., 49(2021),269
Betelgeuse is an important variable star with many observations in the AAVSO database, but there is an annual gap of about four months where Betelgeuse is close to the sun and not observable at night. This gap could be filled with daylight observatio
Externí odkaz:
http://arxiv.org/abs/2112.12673
Autor:
Calderwood, Tom (AUTHOR) pep@cantordust.net
Publikováno v:
Sky & Telescope. Mar2020, Vol. 141 Issue 3, p14-20. 7p. 7 Color Photographs, 5 Graphs.
Autor:
Calderwood, Tom
Publikováno v:
The Thoreau Society Bulletin, 2009 Jul 01(267), 7-8.
Externí odkaz:
https://www.jstor.org/stable/23402959
Autor:
Calderwood, Tom, Persha, Jerry, Kneipp, Paul, van Ballegoij, Erwin, Dempsey, Frank, Fox, Jim, Martin, John, Schlaf, Eric
Observers most commonly use imagers to gather Johnson/Cousins photometry, but cameras have a difficult time with stars as bright as alpha Orionis. Superior results are obtainable with single-channel photometers in the old-school technique known as PE
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::02ce41d3367e4695161aedb2f1d68497