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Achird

Eta Cassiopeiae, 24 Cassiopeiae

Yellow Star in Cassiopeia

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Proper Name	Achird
Bayer Designation	Eta Cassiopeiae
Flamsteed Number	24 Cassiopeiae
HR (BSC)	219
HD	4614
Constellation	Cassiopeia
Right Ascension	0h 49m 6s
Declination	+57° 48' 55"
Distance	19.3 light years 5.9 parsecs
Magnitude	Apparent: +3.5 Absolute: +4.6
Spectral Class	G0V yellow dwarf
Optimum Visibility	October (Usually visible from northern latitudes)
Notes	Achird is a binary and possibly a multiple system. The primary yellow dwarf is orbited by a faint orange star at a distance of some 70 AU (that is, more than double the distance of Neptune from the Sun). There are indications that there may also be a third component star within the system, in a much closer orbit around the yellow primary.

Achird is a near-neighbour of the Solar System, lying less than twenty light years from the Sun. It falls within the boundaries of Cassiopeia, about halfway between the brighter stars Cih and Schedar. Achird is not only close by in astronomical terms, but it is also a yellow dwarf, making it physically very similar to the Sun. The Achird system differs radically from our own Solar System, though, in that the visible yellow star has at least one companion stars.

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