| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 14h50m 17.30146s[1] |
| Declination | −27° 57′ 37.3385″[1] |
| Apparent magnitude (V) | 4.42[2] |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | K2.5 IIIb Fe-1:[3] |
| B−V color index | 1.366±0.050[2] |
| Astrometry | |
| Radial velocity (Rv) | −8.7±1.5[2] km/s |
| Proper motion (μ) | RA: −232.696[1] mas/yr Dec.: −60.118[1] mas/yr |
| Parallax (π) | 11.4440 ± 0.5105 mas[1] |
| Distance | 290 ± 10 ly (87 ± 4 pc) |
| Absolute magnitude (MV) | −0.60[2] |
| Details[4] | |
| Mass | 0.88 M☉ |
| Radius | 33.40+0.41 −1.13[1] R☉ |
| Luminosity | 310.19 L☉ |
| Surface gravity (log g) | 1.35 cgs |
| Temperature | 4,210 K |
| Metallicity [Fe/H] | −0.43±0.04[2] dex |
| Age | 8.1 Gyr |
| Other designations | |
E Hya, 58 Hya, CD−27°10073, HD 130694, HIP 72571, HR 5526, SAO 182911, LTT 5887[5] | |
| Database references | |
| SIMBAD | data |
58 Hydrae is a single[6] star in the equatorial constellationofHydra, located around 290 light years away from the Sun based on parallax.[1] It has the Bayer designation E Hydrae; 58 Hydrae is the Flamsteed designation − a later designation of 6 Librae.[7] It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.42.[2] This object is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.[2]
This is an aging giant star with a stellar classificationofK2.5 IIIb Fe-1:,[3] most likely (98% chance) on the red giant branch.[4] The suffix notation indicates an underabundance of iron in the spectrum, and some uncertainty about the classification. It is around 8.1 billion years old with 0.88 times the mass of the Sun.[4] As a consequence of exhausting the hydrogen at its core, the star has expanded to 33.4[1] times the Sun's radius. It is radiating 310 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,210 K.[4]
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