01h46m35.29944s, +17° 24′ 45.7133″
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h46m 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 constellationofPisces, near the eastern constellation border with Aries. Before the constellation borders were officially set, it held the Flamsteed designationof3 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]
