Instrumental
Yes
Explicit notes
Sagittarius A* is the supermassive black hole at the Galactic Center of the Milky Way. It is located near the border of the constellations Sagittarius and Scorpius, visually close to the Butterfly Cluster (M6) and Lambda Scorpii.
The object is a bright and very compact astronomical radio source. The name Sagittarius A* follows from historical reasons. In 1954,[8] John D. Kraus, Hsien-Ching Ko, and Sean Matt listed the radio sources they identified with the Ohio State University radio telescope at 250 MHz. The sources were arranged by constellation and the letter assigned to them was arbitrary, with A denoting the brightest radio source within the constellation. The asterisk * is because its discovery was considered "exciting", in parallel with the nomenclature for excited state atoms which are denoted with an asterisk (e.g. the excited state of Helium would be He*). The asterisk was assigned in 1982 by Robert L. Brown, who understood that the strongest radio emission from the center of the galaxy appeared to be due to a compact nonthermal radio object.
AI generated?
No