Eta1 Doradus
Star in the constellation Dorado
From Wikipedia, the free encyclopedia
Eta1 Doradus, Latinized from η1 Doradus, is a star in the southern constellation of Dorado. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.72.[1] This object is located approximately 342 light years distant from the Sun, based on parallax, and is drifting further away with a radial velocity of +18 km/s.[1] It is circumpolar south of latitude 24°S.
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Dorado[1] |
| Right ascension | 06h 06m 09.38177s[2] |
| Declination | −66° 02′ 22.6352″[2] |
| Apparent magnitude (V) | 5.72[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A0V[3] |
| U−B color index | −0.024±0.004[1] |
| B−V color index | −0.03[4] |
| Astrometry | |
| Radial velocity (Rv) | +17.6±4.3[1] km/s |
| Proper motion (μ) | RA: +13.575[2] mas/yr Dec.: +28.139[2] mas/yr |
| Parallax (π) | 9.5464±0.0474 mas[2] |
| Distance | 342 ± 2 ly (104.8 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.75[1] |
| Details | |
| Mass | 2.46[5] M☉ |
| Radius | 2.5[6] R☉ |
| Luminosity | 49[7] L☉ |
| Surface gravity (log g) | 4.09±0.08[8] cgs |
| Temperature | 10,325±240[8] K |
| Rotational velocity (v sin i) | 149[5] km/s |
| Age | 94[5] Myr |
| Other designations | |
| η1 Dor, CPD−66°493, GC 7813, HD 42525, HIP 28909, HR 2194, SAO 249448, PPM 355182, TYC 8905-1950-1[9] | |
| Database references | |
| SIMBAD | data |
This object is an A-type main-sequence star with a stellar classification of A0V.[3] It is 94[5] million years old with a high rotation rate, showing a projected rotational velocity of 149.[5] The star has 2.46[5] times the mass of the Sun and is radiating 49[7] times the Sun's luminosity from its photosphere at an effective temperature of 10,325 K.[8] It is the northern pole star of Venus.[10]