Other deep sky objects Sagittarius (constellation)

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messier 54 first globular cluster found outside milky way.


in 1999 violent outburst @ v4641 sgr thought have revealed location of closest known black hole earth, later investigation increased estimated distance factor of 15. complex radio source sagittarius in sagittarius, near western boundary ophiuchus. astronomers believe 1 of components, known sagittarius a*, associated supermassive black hole @ center of galaxy, mass of 2.6 million solar masses. sagittarius dwarf elliptical galaxy located outside milky way.


baade s window area little obscuring dust shows objects closer milky way s center visible. ngc 6522, magnitude 8.6, , ngc 6528, magnitude 9.5, both globular clusters visible through baade s window. 20,000 , 24,000 light-years earth, shapley classes of vi , v respectively, both moderately concentrated @ cores. ngc 6528 closer galactic core @ approximate distance of 2,000 light-years.


2mass-gc02, known hurt 2, globular cluster @ distance of 16 thousand light-years earth. discovered in 2000 joselino vasquez, , confirmed team of astronomers under leadership of r. j. hurt @ 2mass.








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