Tags: Star.
61 Cygni sometimes called Bessel’s Star or Piazzi’s Flying Star is a binary star system in the constellation Cygnus. It consists of a pair of K-type dwarf stars that orbit each other in a period of about 659 years forming a visual binary. At fifth and sixth apparent magnitudes they are among the least conspicuous stars visible in the night sky to an observer without an optical instrument.61 Cygni first attracted the attention of astronomers because of its large proper motion.
