Starship Asterisk*

[quote=starsurfer post_id=335236 time=1700779326 user_id=137896]
Isn't Sh2-239 classed as a reflection nebula?
[/quote]

No, it's an emission nebula. Embedded in a dark nebula.

Isn't Sh2-239 classed as a reflection nebula?

Yeah, as others have already opined, the location of T Tauri was far from clearly stated in this APOD. Oh how a little tell-tale annotation would have helped! And many Thanksgiving Day (here in the U.S.) thanks to Ann for providing it (as she often does)!

[attachment=0]APOD Turkey.png[/attachment]

[quote=Ann post_id=335226 time=1700718750 user_id=129702]

For a numbskull person like me, those instructions were not too clear.

Ann
[/quote]

Indeed, I was looking for the T Tauri star, thinking it was the bright one at top center. But that didn’t seem to make much sense. Had to look very closely at the full image to find the actual T Tauri. Thanks for your clarification!

[float=left][attachment=2]ngc1555wide1024[1].jpg[/attachment][c][size=85][color=#0040FF]Along the Taurus Molecular Cloud
Image Credit & Copyright: Yuexiao Shen, Joe Hua[/color][/size][/c][/float]
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[quote]APOD Robot wrote: Above and right T Tauri, the prototype of the class of T Tauri variable stars, is next to a yellowish nebula historically known as Hind's Variable Nebula (NGC 1555).[/quote] 🤔 :?:

For a numbskull person like me, those instructions were not too clear. But I guess this is it:


[float=left][/float][float=right][attachment=1]T Tauri from Guide annotated.png[/attachment][/float][attachment=0]APOD 23 November 2023 detail annotated.png[/attachment]
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Ann

[url=https://apod.nasa.gov/apod/ap231123.html] [img]https://apod.nasa.gov/apod/calendar/S_231123.jpg[/img] [size=150]Along the Taurus Molecular Cloud[/size][/url]

[b] Explanation: [/b] The cosmic brush of star formation composed [url=https://www.flickr.com/photos/150464529@N03/53336219347/]this interstellar canvas[/url] of emission, dust, and dark nebulae. A 5 degree wide telescopic mosaic, it frames a region found north of bright star Aldebaran on the sky, at an inner wall of [url=https://skyandtelescope.org/astronomy-news/1000-light-year-bubble-is-the-source-of-all-nearby-baby-stars/?utm_source=cc&utm_medium=newsletter]the local bubble[/url] along the [url=https://apod.nasa.gov/apod/ap111117.html]Taurus molecular cloud[/url]. At lower left, emission cataloged as [url=https://apod.nasa.gov/apod/ap111208.html]Sh2-239[/url] shows signs of embedded young stellar objects. The region's Herbig-Haro objects, nebulosities associated with newly born stars, are marked by tell-tale reddish jets of shocked hydrogen gas. Above and right T Tauri, the prototype of the class of [url=https://www.aavso.org/vsots_ttau]T Tauri variable stars[/url], is next to a yellowish nebula historically known as Hind's Variable Nebula ([url=https://apod.nasa.gov/apod/ap220210.html]NGC 1555[/url]). T Tauri stars are now generally recognized as young, less than a few million years old, sun-like stars still in the early [url=https://universe.nasa.gov/stars/basics/]stages of formation[/url].


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