Sky Object of the Month – December 2017

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Sky Object of the Month – December 2017

(Courtesy LVAS Observer’s Challenge*)

NGC 925 – Barred Spiral Galaxy in Triangulum (Mag. 10.0; Size 9.8’ X 6.0’)

 

Our December LVAS Observer’s Challenge is the barred spiral galaxy NGC 925, located 2 degrees east of the 4th magnitude star gamma (γ) Trianguli. It was discovered by William Herschel on September 13, 1784, and bears the Herschel Catalog designation HIII 177 (the 177th entry in Class III [Very Faint Nebulae]). He described it in part as, “Very faint, considerably large, irregularly round.”

Any Class III Herschel object would be a visual test for modest-sized scopes, and NGC 925 is no exception. It’s apparently too challenging to have been included in the Astronomical League’s Herschel 400 observing program. If you’re able to glimpse this galaxy, can you detect the ESE to WNW orientation of the elongated core? At what aperture do the spiral arms become visible? Ideally, you’d want to check out NGC 925 from a dark sky location. If you live in an area with skies of average (mag 5) limiting magnitude, how well can you see it?

 

 Glenn Chaple for the LVAS

 

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Astronomy Magazine

 

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