2 Cygni (HIP 95372)

2 Cygni is a blue-white star in the constellation Cygnus. At 900 light years away, it shines at an apparent visual magnitude of 4.98. It is moving through the Galaxy at a speed of 32.1 km/s relative to the Sun.

Sky position: RA 19h 24.1m, Dec +29° 37.3'

Common designations: 2 Cygni, HR 7372, HD 182568, HIP 95372, Gaia DR3 2038567370506134528

2 Cygni has the spectral type B3/4+B6/9. B-type stars are hot (about 10,000 to 30,000 K), luminous and blue-white. They are massive, short-lived stars, typically only tens of millions of years old, and are common in young clusters and OB associations.

How to find 2 Cygni in the sky

2 Cygni lies in Cygnus. With a declination of +29° 37.3', it is visible from the entire Northern Hemisphere and from the Southern Hemisphere down to about latitude 60° S. It is bright enough to see with the naked eye under dark skies. It is highest in the sky at local midnight around August, which makes the weeks around that month the best time to observe it.

Tabulated data for 2 Cygni

Astrometry and spectroscopy

Right Ascension (J2000)	291.03157651° (19h 24.1m)
Declination (J2000)	29.62133557° (+29° 37.3')
Galactic Longitude	62.90374825°
Galactic Latitude	6.62677790°
Proper motion RA	12.23 mas/yr
Proper motion Dec	11.23 mas/yr
Parallax	3.62 ± 0.14 mas
Spectral Type	B3/4+B6/9
Radial Velocity	-23.60 km/s

Photometry

Band	Magnitude	Abs. Mag.
U	4.16	-3.04
B	4.85	-2.35
V	4.98	-2.23
J	5.15	-2.05
H	5.27	-1.93
K	5.28	-1.92

Colour index B-V: -0.13

Derivations

Heliocentric distance: 275.95 pc (900 light years) (3.8% margin of error)
Absolute visual magnitude: -2.23
Transverse velocity: 21.7 km/s
Space velocity relative to the Sun: 32.1 km/s
Galactic position (X, Y, Z): 124.8 pc, 244.0 pc, 31.8 pc
Galactic velocity (U, V, W): -28.5 km/s, -10.8 km/s, -10.1 km/s

Data: Extended Hipparcos Compilation (XHIP) and SIMBAD.