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2026-07-26T13:16:25Z

Komet C/2025 R3 PANSTARRS ... Aus dem äussersten Sonnensystem kommend erreicht er dieser Tage seinen sonnennächsten Punkt, danach geht er wieder zurück in die Oortsche Wolke. Seine Umlaufzeit == 170.

← Nächstältere Version		Version vom 26. Juli 2026, 13:16 Uhr
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-	==Star Link Satelliten ~~am Montag ca. 17:47~~==	+	==Star Link Satelliten ==
	https://www.heute-am-himmel.de/satelliten/starlink		https://www.heute-am-himmel.de/satelliten/starlink
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		+	...
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		+	==Komet C/2025 R3 PANSTARRS ...==
		+	Aus dem äussersten Sonnensystem kommend erreicht er dieser Tage seinen sonnennächsten Punkt,
		+	danach geht er wieder zurück in die Oortsche Wolke. Seine Umlaufzeit == 170.000 Jahre ... 180426 via db
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		+	...
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		+	PanSTARRS and Planets (APOD: 2026 Apr 18)
		+	Image Credit & Copyright: Luc Perrot (TWAN)
		+	https://apod.nasa.gov/apod/ap260418.html
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		+	Explanation: Near the eastern horizon before sunrise, Comet C/2025 R3 PanSTARRS is getting brighter. Readily visible in binoculars and small telescopes, the comet may be just on the verge of naked-eye visibility from dark sky sites. Though it was not quite apparent to the eye, PanSTARRS is still easy to spot in this camera image taken on April 16. In the view from a volcanic peak overlooking France's Reunion Island, planet Earth, the comet shares eastern predawn skies with naked-eye planets Mars and Mercury and fainter Neptune. Saturn is hiding behind the low cloudbank that doesn't quite hide an old crescent Moon.
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		+	This is a good weekend for northern hemisphere comet watchers to try to catch PanSTARRS an hour or so before sunrise, as the comet grows brighter approaching its perihelion on April 19. On April 26 the comet makes its closest approach to our fair planet but by then will be difficult to see in the solar glare. Good views of this comet PanSTARRS in later April and early May will be from the southern hemisphere.
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		+	https://www.lucperrot.fr/bio
		+	https://twanight.org/profile/luc-perrot/
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		+	...
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		+	AlphaCentauri is often said to be the closest star to our sun. It's true that when you look at this star - the 3rd-brightest star in our night sky - you can think of it as the closest star. But, really, it's the closest star system to our sun. The single star we see as Alpha Centauri becomes 2 stars through a telescope. This pair is just 4.37 light-years away from us. A 3rd star in the system, Proxima Centauri, orbits around the 2 larger stars. And, at 4.25 light-years away, Proxima is the closest known star.
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		+	...
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		+
		+	==The Biographical Encyclopedia of Astronomers ==
		+
		+	is a unique and valuable resource for historians and astronomers alike. It includes approximately 2300 biographical sketches of astronomers from antiquity to modern times. Led by an editorial board of historians and astronomers, this is the collective work of over 400 authors. It provides biographical information on astronomers and planetary scientists, utilizing contemporary historical scholarship.
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		+	The revised third edition adds approximately 450 new biographical sketches to this comprehensive reference work. It brings existing entries fully up to date and expands on gaps in 19th century coverage. Additionally, it now extends its scope from individuals born prior to 1920 to those born before roughly 1950. The editors have carefully navigated the burgeoning, interdisciplinary subfields of 20th century astronomy to curate dozens of new entries on individuals who contributed directly to astronomy and planetary science during that period.
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		+	Individual entries vary from 100 to 1500 words, including luminaries such as Aristarchus, Claudius Ptolemy, Sir Isaac Newton and Albert Einstein, as well as lesser-known astronomers like Galileo's acolyte, Mario Guiducci.
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		+	https://link.springer.com/referencework/10.1007/978-1-0716-0738-1

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