Pi Serpentis

Pi Serpentis, Latinized from π Serpentis, is a solitary^[13] white-hued star in the constellation Serpens, located in its head, Serpens Caput. Based upon an annual parallax shift of 18.22 mas as seen from Earth, it is located around 179 light years from the Sun. It is visible to the naked eye with an apparent visual magnitude of 4.82.^[2]

Pi Serpentis

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Serpens
Right ascension	16h 02m 17.69166s[1]
Declination	+22° 48′ 16.0302″[1]
Apparent magnitude (V)	4.82[2]
Characteristics
Spectral type	A3 V[3]
U−B color index	+0.10[2]
B−V color index	+0.06[2]
Astrometry
Radial velocity (Rv)	−28.2±4.2[4] km/s
Proper motion (μ)	RA: +4.03[1] mas/yr Dec.: +23.60[1] mas/yr
Parallax (π)	18.22±0.26 mas[1]
Distance	179 ± 3 ly (54.9 ± 0.8 pc)
Absolute magnitude (MV)	1.12[5]
Details
Mass	2.50[6] M☉
Radius	2.27[7] R☉
Luminosity	27[8] L☉
Surface gravity (log g)	4.040[9] cgs
Temperature	7,566±12[10] K
Metallicity [Fe/H]	0.380[9] dex
Rotational velocity (v sin i)	128[11] km/s
Age	320[6] Myr
Other designations
π Ser, 44 Serpentis, BD+23°2886, FK5 3268, HD 143894, HIP 78554, HR 5972, SAO 84155[12]
Database references
SIMBAD	data

This is an A-type main sequence star with a stellar classification of A3 V.^[3] It is about 320^[6] million years old with a high rate of spin, measured at a 128^[11] km/s projected rotational velocity. The star has an estimated 2.50^[6] times the mass of the Sun and 2.27^[7] times the Sun's radius. It is radiating 27^[8] times the solar luminosity from its photosphere at an effective temperature of 7,566 K.^[10]

In 1992, an infrared excess was detected from this system at a wavelength of 60μm.^[14] The data suggests a dusty debris disk with a temperature of 45 K is orbiting 211 AU from the host star.^[7]