NGC 1647

NGC 1647 is an open cluster in the constellation Taurus. It contains nearly 90 stars and it lies at a distance of 550 parsec.^[2] It is visible even with binoculars close to Aldebaran. It was discovered by William Herschel in 1784.^[3] It is located behind the Taurus dark nebula complex, approximately 160 parsec away. The brightest main sequence stars are of spectral type B7. Its age is estimated to be 150 million years.^[4]

NGC 1647
Observation data (J2000 epoch)
Right ascension	04h 45m 55s[1]
Declination	±19° 06′ 54″[1]
Distance	1,800 ly (on average) (550 pc[2])
Apparent magnitude (V)	6.4[1]
Apparent dimensions (V)	45'
Physical characteristics
Other designations	Cr 54
Associations
Constellation	Taurus
See also: Open cluster, List of open clusters