Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 14h 10m 50.48706s[2] |
Declination | −16° 18′ 07.3105″[2] |
Apparent magnitude (V) | 4.910[3] |
Characteristics | |
Spectral type | M2 IIIa[4] |
U−B color index | +1.72[3] |
Variable type | SRB[5] |
Astrometry | |
Radial velocity (Rv) | +18.58±0.56[6] km/s |
Proper motion (μ) | RA: +3.277[2] mas/yr Dec.: −10.804[2] mas/yr |
Parallax (π) | 5.8655 ± 0.2552 mas[2] |
Distance | 560 ± 20 ly (170 ± 7 pc) |
Absolute magnitude (MV) | −0.81[7] |
Details | |
Mass | 3.24[8] M☉ |
Radius | 83[9] R☉ |
Luminosity | 963[2] L☉ |
Temperature | 3,899[2] K |
Metallicity [Fe/H] | −0.21±0.06[10] dex |
Rotational velocity (v sin i) | 2.3±0.9[11] km/s |
Other designations | |
Database references | |
SIMBAD | data |
ET Virginis is a single,[13] 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.[3] Based upon an annual parallax shift of 5.9 mas,[2] it is located 560 light years away. It is moving further from the Earth with a heliocentric radial velocity of +18.6 km/s,[6] having come within 177 ly of the Sun around 6.3 million years ago.[7]
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 |
This is an evolved red giant star with a stellar classification of M2 IIIa.[4] It is a semiregular variable star of subtype SRB with a magnitude that ranges from a high of 4.80 down to 5.00.[5] The measured angular diameter of this star, after correcting for limb darkening, is 4.79±0.34 mas.[14] At its estimated distance, this yields a physical size of 83 times the radius of the Sun.
Tabur2009
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