5 Serpentis (HIP 74975)

5 Serpentis is a yellow-white subgiant star in the constellation Serpens. It lies about 82 light years away. It is moving through the Galaxy at a speed of 93.1 km/s relative to the Sun.

Sky position: RA 15h 19.3m, Dec +1° 45.9'

Common designations: 5 Serpentis, MQ Serpentis, HR 5694, HD 136202, HIP 74975, Gaia DR3 4421455530273900032

5 Serpentis has the spectral type F8IV. F-type stars are yellow-white stars of about 6,000 to 7,500 K, slightly hotter and more massive than the Sun. Their hydrogen lines are weaker than in A stars and metal lines become prominent. Its luminosity class IV marks it as a subgiant: it has exhausted hydrogen in its core and is beginning to expand toward the giant phase.

How to find 5 Serpentis in the sky

5 Serpentis lies in Serpens. With a declination of +1° 45.9', it is visible from the entire Northern Hemisphere and from the Southern Hemisphere down to about latitude 88° S. It is highest in the sky at local midnight around June, which makes the weeks around that month the best time to observe it.

Tabulated data for 5 Serpentis

Astrometry and spectroscopy

Right Ascension (J2000)	229.82832267° (15h 19.3m)
Declination (J2000)	1.76540733° (+1° 45.9')
Galactic Longitude	3.67514239°
Galactic Latitude	46.45032725°
Proper motion RA	372.22 mas/yr
Proper motion Dec	-513.48 mas/yr
Parallax	39.80 ± 0.08 mas
Spectral Type	F8IV
Radial Velocity	54.43 km/s

Photometry

Band	Magnitude	Abs. Mag.
B	5.60	3.60
R	4.80	2.80
J	4.34	2.34
H	3.95	1.95
K	4.01	2.01

Derivations

Heliocentric distance: 25.13 pc (82 light years) (0.2% margin of error)
Transverse velocity: 75.5 km/s
Space velocity relative to the Sun: 93.1 km/s
Galactic position (X, Y, Z): 17.3 pc, 1.1 pc, 18.2 pc
Galactic velocity (U, V, W): 91.5 km/s, -13.8 km/s, -10.8 km/s

Data: Extended Hipparcos Compilation (XHIP) and SIMBAD.