Epsilon Serpentis information

ε Serpentis
	Location of ε Serpentis (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Serpens
Right ascension	15h 50m 48.96622s
Declination	+04° 28′ 39.8311″
Apparent magnitude (V)	+3.69
Characteristics
Spectral type	kA2hA5mA7 V
U−B color index	+0.12
B−V color index	+0.14
Astrometry
Radial velocity (Rv)	−9.4±0.6 km/s
Proper motion (μ)	RA: +128.19 mas/yr ; Dec.: +62.16 mas/yr
Parallax (π)	46.30 ± 0.19 mas
Distance	70.4 ± 0.3 ly ; (21.60 ± 0.09 pc)
Absolute magnitude (MV)	+2.04
Details
Mass	1.820±0.026 M☉
Radius	1.783±0.040 R☉
Luminosity	12.134±0.296 L☉
Surface gravity (log g)	4.346 cgs
Temperature	7,928±88 K
Metallicity [Fe/H]	+0.38 dex
Rotational velocity (v sin i)	33.1 km/s
Age	500±200 Myr
Other designations
	ε Ser, 37 Serpentis, BD+04°3069, HD 141795, HIP 77622, HR 5892, SAO 121218
Database references
SIMBAD	data

Epsilon Serpentis, Latinized from ε Serpentis, is a single,^[9] white-hued star in the constellation Serpens, in its head (Serpens Caput). It is visible to the naked eye with an apparent visual magnitude of +3.69.^[2] Based upon an annual parallax shift of 46.30 mas as seen from Earth,^[1] it is located 70 light years from the Sun. It is moving closer to the Sun with a radial velocity of −9 km/s.^[4]

This is an Am star^[10] on the main-sequence with a stellar classification of kA2hA5mA7 V.^[3] This notation indicates the spectrum displays the calcium K-line of an A2 star, the hydrogen lines of an A5 star, and the metal lines of an A7 star.^[11] It has been examined for the presence of a magnetic field, but the detected level was not statistically significant.^[12]

Epsilon Serpentis has an estimated 1.82 times the mass of the Sun and 1.78 times the Sun's radius.^[6] The star is radiating 12^[6] times the Sun's luminosity from its photosphere at an effective temperature of around 7,928 K.^[7] It is a candidate for an infrared excess at a wavelength of 25 μm, suggesting a circumstellar disk of dust with a temperature of 250±70 K may be orbiting roughly 4.2 AU from the host star.^[13] The star is around half^[6] a billion years old and is spinning with a projected rotational velocity of 33.1 km/s.^[7]

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[Smith2010-13] Cite error: The named reference Smith2010 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of ε Serpentis (circled)
Constellation	Serpens
Right ascension	15^h 50^m 48.96622^s^[1]
Declination	+04° 28′ 39.8311″^[1]
Apparent magnitude (V)	+3.69^[2]
Characteristics
Spectral type	kA2hA5mA7 V^[3]
U−B color index	+0.12^[2]
B−V color index	+0.14^[2]
Astrometry

Radial velocity (R_v)	−9.4±0.6^[4] km/s
Proper motion (μ)	RA: +128.19^[1] mas/yr Dec.: +62.16^[1] mas/yr
Parallax (π)	46.30 ± 0.19 mas^[1]
Distance	70.4 ± 0.3 ly (21.60 ± 0.09 pc)
Absolute magnitude (M_V)	+2.04^[5]

Details

Mass	1.820±0.026^[6] `M`_☉
Radius	1.783±0.040^[6] `R`_☉
Luminosity	12.134±0.296^[6] `L`_☉
Surface gravity (log g)	4.346^[7] cgs
Temperature	7,928±88^[7] K
Metallicity [Fe/H]	+0.38^[7] dex
Rotational velocity (v sin i)	33.1^[7] km/s
Age	500±200^[6] Myr

Other designations
ε Ser, 37 Serpentis, BD+04°3069, HD 141795, HIP 77622, HR 5892, SAO 121218^[8]
Database references
SIMBAD	data

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