VZ Arietis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 02h 48m 45.90719s |
| Declination | +25° 11′ 16.9541″ |
| Apparent magnitude (V) | 5.89 (5.82 - 5.89) |
| Characteristics | |
| Spectral type | A0 V |
| B−V color index | −0.033±0.005 |
| Variable type | α2 CVn |
| Astrometry | |
| Radial velocity (Rv) | +13.8±2.9 km/s |
| Proper motion (μ) | RA: +56.600 mas/yr Dec.: −0.264 mas/yr |
| Parallax (π) | 5.7743±0.1298 mas |
| Distance | 560 ± 10 ly (173 ± 4 pc) |
| Absolute magnitude (MV) | 0.48 |
| Details | |
| Mass | 2.74±0.09 M☉ |
| Radius | 3.1 R☉ |
| Luminosity | 78.7+15.1 −12.7 L☉ |
| Surface gravity (log g) | 4.10 cgs |
| Temperature | 10,304+72 −71 K |
| Metallicity [Fe/H] | +0.1 dex |
| Rotational velocity (v sin i) | 54 km/s |
| Other designations | |
| 16 Trianguli, VZ Arietis, BD+24°396, FK5 5868, HD 17471, HIP 13121, HR 830, SAO 75588 | |
| Database references | |
| SIMBAD | data |
VZ Arietis is single, white-hued star in the northern zodiac constellation of Aries. Varying between magnitudes 5.82 and 5.89, the star can be seen with the naked eye in dark, unpolluted areas. Based upon an annual parallax shift of 5.8 mas, it is located 560 light years from the Sun. It is moving further away with a heliocentric radial velocity of +14 km/s. The star was formerly known as 16 Trianguli, but as the star is no longer in the constellation Triangulum, this designation has fallen out of use.
In 1984, the Czechoslovakian astronomer Juraj Zverko announced that the star, then called HR 830, is a variable star. It was given its variable star designation, VZ Arietis, in 1987.
This is a chemically peculiar star of type CP2 (Ap star), showing an anomalous abundance of silicon in its spectrum. It has a stellar classification of A0 V, which indicates this is an A-type main-sequence star that currently fusing hydrogen into helium in its core. This is an Alpha2 Canum Venaticorum variable with 2.7 times the mass of the Sun and about 3.1 times the Sun's radius. It is radiating 79 times the Sun's luminosity from its photosphere at an effective temperature of 10,304 K.