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並前往https://www.assa.org.au/resources/sky-watching/constellations/canis-major-the-big-dog/

Canis Major, The Big Dog - Astronomical Society of South ...

Moving south from Sirius 3.5° you will come across M41. ... Now travel about 5.5° north to NGC 2440, a planetary nebula shinning at magnitude 10.5.

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