10 Vulpeculae

10 Vulpeculae is an astrometric binary^[7] star system in the northern constellation of Vulpecula. It is faintly visible to the naked eye with an apparent visual magnitude of 5.497.^[2] The system is located roughly 330 light years from the Sun, as determined from an annual parallax shift of 9.83±0.49 mas.^[1] It is moving closer to the Sun with a heliocentric radial velocity of −9.9 km/s.^[2]

10 Vulpeculae

Observation data Epoch J2000      Equinox J2000
Constellation	Vulpecula
Right ascension	19h 43m 42.92539s[1]
Declination	+25° 46′ 18.9293″[1]
Apparent magnitude (V)	5.497[2]
Characteristics
Spectral type	G8 III[2]
B−V color index	0.923[2]
Astrometry
Radial velocity (Rv)	−9.9[2] km/s
Proper motion (μ)	RA: +12.01[1] mas/yr Dec.: +21.44[1] mas/yr
Parallax (π)	9.83±0.49 mas[1]
Distance	330 ± 20 ly (102 ± 5 pc)
Absolute magnitude (MV)	0.47[3]
Details
Mass	2.35[2] M☉
Radius	13[4] R☉
Luminosity	72[2] L☉
Surface gravity (log g)	3.08[5] cgs
Temperature	5,008±33[2] K
Metallicity [Fe/H]	−0.11[5] dex
Age	1.15[2] Gyr
Other designations
10 Vul, BD+25°3933, FK5 1515, HD 186486, HIP 97077, HR 7506, SAO 87633[6]
Database references
SIMBAD	data

The system is a source of X-ray emission.^[8] The visible component is an aging giant star with a stellar classification of G8 III.^[2] At the age of 1.15 billion years,^[2] it has exhausted the hydrogen at its core region and expanded off the main sequence. It is about 13^[4] times the Sun's radius and 2.35^[2] times the Sun's mass. The star is radiating 72^[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,008 K.^[2]