Nu Hydrae
Template:Location mark Location of ν Hydrae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 3.115[3] |
| Characteristics | |
| Spectral type | K0/K1 III[4] |
| U−B Template:Engvar | +1.305[3] |
| B−V Template:Engvar | +1.239[3] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: +93.35[2] mas/yr Dec.: +198.88[2] mas/yr |
| Parallax (π) | 23.7940±0.1695 mas[6] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.11[1] |
| Details | |
| Mass | 2.0[7] Template:Solar mass |
| Radius | 21[5] Template:Solar radius |
| Luminosity | 151[5] Template:Solar luminosity |
| Surface gravity (log g) | 2.3[5] cgs |
| Temperature | 4,335[5] K |
| Metallicity [Fe/H] | −0.30[5] dex |
| Rotational velocity (v sin i) | 5.3[5] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
Nu Hydrae, Latinized from ν Hydrae, is an orange-hued star in the constellation Hydra, near the border with the neighboring constellation of Crater. It has an apparent visual magnitude of 3.115,[3] which is bright enough to be seen with the naked eye. Based upon parallax measurements, this star is located at a distance of about Script error: No such module "convert". from the Earth.[2]
The spectrum of this star matches a stellar classification of K0/K1 III,[4] where the luminosity class of 'III' indicates this is a giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence. The radius of this star has expanded to 21 times the Sun's radius[5] and it radiates about 151 times the luminosity of the Sun.[5] This expanded outer envelope has an effective temperature of about 4,335 K,[5] giving it the characteristic orange hue of a K-type star.[9]
Nu Hydrae is an X-ray emitter with an estimated luminosity of 6.6 × 1028 erg s−1 in the X-ray band.[7] The abundance of elements other than hydrogen and helium, what astronomers term the star's metallicity,[5] is about half that in the Sun.Template:Efn It has a relatively high proper motion across the celestial sphere,[8] suggesting that it has a peculiar velocity roughly three times higher than its neighbors.[10]
Nu Hydrae was a later designation of 4 Crateris.[11]
Notes
References
<templatestyles src="Reflist/styles.css" />
- ↑ a b Template:Cite XHIP
- ↑ a b c d e Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d e f g h i j k Script error: No such module "Citation/CS1".
- ↑ Template:Cite Gaia EDR3
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
Script error: No such module "Check for unknown parameters".