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Eta2 Doradus, Latinized from η2 Doradus, is a star in the southern constellation of Dorado. It is visible to the naked eye as a dim, reddish star with an apparent visual magnitude of 5.01[2] It is about 580 light years from the Sun as shown by parallax, and its net movement is one of receding, having a radial velocity of +34.5 km/s.[2] It is circumpolar south of latitude 24° 24′ S.[5]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 06h 11m 15.0s[1] |
| Declination | −65° 35′ 21.9″[1] |
| Apparent magnitude (V) | 5.01[2] |
| Characteristics | |
| Spectral type | M2.5III[2] |
| B−V color index | 1.599[2] |
| Astrometry | |
| Radial velocity (Rv) | +34.5±0.8[2] km/s |
| Proper motion (μ) | RA: -23.823[1] mas/yr Dec.: +118.639[1] mas/yr |
| Parallax (π) | 5.6046 ± 0.1562 mas[1] |
| Distance | 580 ± 20 ly (178 ± 5 pc) |
| Absolute magnitude (MV) | −1.45[2] |
| Details | |
| Radius | 81.89[1] R☉ |
| Luminosity | 1165[1] L☉ |
| Surface gravity (log g) | 0.403[3] cgs |
| Temperature | 3,726+313 −154[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
This object is an M-type giant star, with its stellar classification being M2.5III.[2][6] It has left the main sequence after exhausting its core hydrogen and expanded to around 80 R☉. The star is radiating about 1200[1] times the Sun's luminosity from its photosphere, at an effective temperature of 3726 K.[1]
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