HR 515

HR 515

Light curves for VY Piscium, adapted from Valtier et al. (1974).[1] The vertical scale is hundredths of a magnitude.
Observation data Epoch J2000      Equinox J2000
Constellation	Pisces
Right ascension	01h 46m 35.29855s[2]
Declination	+17° 24′ 45.7125″[2]
Apparent magnitude (V)	6.54 - 6.59[3]
Characteristics
Spectral type	A8 III[4] or F0V[5]
B−V color index	0.256±0.010[6]
Variable type	δ Sct[7]
Astrometry
Radial velocity (Rv)	−1.0±4.4[8] km/s
Proper motion (μ)	RA: +49.315[2] mas/yr Dec.: +3.096[2] mas/yr
Parallax (π)	6.4827 ± 0.1220 mas[2]
Distance	503 ± 9 ly (154 ± 3 pc)
Absolute magnitude (MV)	+0.84[6]
Details
Mass	1.7[9] M☉
Radius	4.7[9] R☉
Luminosity	60[9] L☉
Surface gravity (log g)	3.32[9] cgs
Temperature	7,401[9] K
Metallicity [Fe/H]	−0.02[10] dex
Rotational velocity (v sin i)	96[11] km/s
Age	944[10] Myr
Other designations
3 Arietis, VY Psc, BD+16°196, HD 10845, HIP 8271, HR 515, SAO 92622[12]
Database references
SIMBAD	data

HR 515 is a variable star in the zodiac constellation of Pisces, near the eastern constellation border with Aries. Before the constellation borders were officially set, it held the Flamsteed designation of 3 Arietis, abbreviated 3 Ari). This star has the variable star designation VY Piscium, or VY Psc for short.^[13] It is a white-hued star that is near the lower limit of visibility to the naked eye with an apparent visual magnitude that ranges from 6.54 down to 6.59.^[3] Parallax measurements provide a distance estimate of approximately 503 light years from the Sun.^[2]

Gray and associates (1989) found a stellar classification of A8 III^[4] for this object, matching an evolved A-type giant star. Abt and Morrell (1995) listed a class of F0V,^[5] suggesting it is an F-type main-sequence star. It is a Delta Scuti variable whose brightness varies between magnitudes 6.54 and 6.59^[3] with a period of 0.219 days.^[7] The star shows a high rate of spin with a projected rotational velocity of 96 km/s.^[11] It has 4.7 times the size of the Sun and is radiating 60 times the Sun's luminosity from its photosphere at an effective temperature of 7,401 K.^[9]