Nu Tucanae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Tucana |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 4.75 - 4.93[3] |
| Characteristics | |
| Spectral type | M4 III[4] |
| U−B Template:Engvar | +1.73[5] |
| B−V Template:Engvar | +1.61[5] |
| Variable type | Lb:[6] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[7] km/s |
| Proper motion (μ) | RA: −3.40[2] mas/yr Dec.: −0.8[2] mas/yr |
| Parallax (π) | 11.24±0.23 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +0.16[8] |
| Details | |
| Radius | 64.37[9] Template:Solar radius |
| Luminosity | Script error: No such module "val".[9] Template:Solar luminosity |
| Surface gravity (log g) | 0.778[9] cgs |
| Temperature | Script error: No such module "val".[9] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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ν Tucanae, Latinized as Nu Tucanae, is a solitary,[11] variable star in the southern constellation of Tucana. This red-hued object is visible to the naked eye as a faint star with an apparent visual magnitude that fluctuates around +4.80.[5] It is located approximately 290 light years from the Sun based on parallax,[2] but is drifting closer with a radial velocity of −3 km/s.[7]
This object is an aging red giant with a stellar classification of M4 III,[4] currently on the asymptotic giant branch.[6] With the supply of hydrogen exhausted at its core, the star has cooled and expanded off the main sequence; at present it has 49 times the Sun's radius.[12] It is classified as a slow irregular variable and its brightness varies from magnitude +4.75 to +4.93.[3] Cyclical periods of 22.3, 24.4, 24.8, 25.1, 25.5, 33.8, 50.6, 80.1, 123.2, and 261.8 days have been reported for its variations.[13] On average, the star is radiating around 400[12] times the luminosity of the Sun from its photosphere at an effective temperature of 3,674 K.[12]
References
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- ↑ Script error: No such module "citation/CS1".
- ↑ a b c d e f Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ 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".
- ↑ a b c d Script error: No such module "citation/CS1". Nu Tucanae's database entry at VizieR.
- ↑ Template:Cite simbad
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c Template:Cite DR2
- ↑ Script error: No such module "citation/CS1".
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