ET Virginis
ET Virginis is a single, red-hued star in the equatorial constellation of Virgo. It can be viewed with the naked eye, having an apparent visual magnitude of 4.91. Based upon an annual parallax shift of 5.9 mas, it is located 560 light years away. It is moving further from the Earth with a heliocentric radial velocity of +18.6 km/s, having come within 177 ly of the Sun around 6.3 million years ago.
| Period (Days) | 22.6 | 23.8 | 36.4 | 37.6 | 39.8 | 48.8 | 259.1 |
|---|---|---|---|---|---|---|---|
| Amplitude (mag.) | 0.021 | 0.023 | 0.018 | 0.027 | 0.021 | 0.019 | 0.032 |
A light curve for ET Virginis, plotted from data published by Tabur et al. (2009) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 14h 10m 50.48706s |
| Declination | −16° 18′ 07.3105″ |
| Apparent magnitude (V) | 4.910 |
| Characteristics | |
| Spectral type | M2 IIIa |
| U−B color index | +1.72 |
| Variable type | SRB |
| Astrometry | |
| Radial velocity (Rv) | +18.58±0.56 km/s |
| Proper motion (μ) | RA: +3.277 mas/yr Dec.: −10.804 mas/yr |
| Parallax (π) | 5.8655 ± 0.2552 mas |
| Distance | 560 ± 20 ly (170 ± 7 pc) |
| Absolute magnitude (MV) | −0.81 |
| Details | |
| Mass | 3.24 M☉ |
| Radius | 83 R☉ |
| Luminosity | 963 L☉ |
| Temperature | 3,899 K |
| Metallicity [Fe/H] | −0.21±0.06 dex |
| Rotational velocity (v sin i) | 2.3±0.9 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an evolved red giant star with a stellar classification of M2 IIIa. It is a semiregular variable star of subtype SRB with a magnitude that ranges from a high of 4.80 down to 5.00. The measured angular diameter of this star, after correcting for limb darkening, is 4.79±0.34 mas. At its estimated distance, this yields a physical size of 83 times the radius of the Sun.