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]
Distance503 ± 9 ly
(154 ± 3 pc)
Absolute magnitude (MV)+0.84[6]
Details
Mass1.7[9] M☉
Radius4.7[9] R☉
Luminosity60[9] L☉
Surface gravity (log g)3.32[9] cgs
Temperature7,401[9] K
Metallicity [Fe/H]−0.02[10] dex
Rotational velocity (v sin i)96[11] km/s
Age944[10] Myr
Other designations
3 Arietis, VY Psc, BD+16°196, HD 10845, HIP 8271, HR 515, SAO 92622[12]
Database references
SIMBADdata

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]

  1. ^ Cite error: The named reference Valtier was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference AAVSO was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gray1989 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference abt1995 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Rodriguez2000 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  9. ^ a b c d e f Cite error: The named reference ticv8 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference gontcharov20122 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Royer2002 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference VSNET was invoked but never defined (see the help page).