Iota Sagittarii
Template:Location mark Location of ι Sagittarii (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +4.118[2] |
| Characteristics | |
| Spectral type | K0 II-III[3] |
| U−B Template:Engvar | +0.911[2] |
| B−V Template:Engvar | +1.084[2] |
| Astrometry | |
| Radial velocity (Rv) | +35.8[3] km/s |
| Proper motion (μ) | RA: +22.61[1] mas/yr Dec.: +51.40[1] mas/yr |
| Parallax (π) | 17.94±0.21 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +0.39[4] |
| Details | |
| Mass | 1.40[3] Template:Solar mass |
| Radius | 15[5] Template:Solar radius |
| Luminosity | 87[3] Template:Solar luminosity |
| Surface gravity (log g) | 1.89[6] cgs |
| Temperature | Script error: No such module "val".[3] K |
| Metallicity [Fe/H] | −0.26[6] dex |
| Age | 4.74[3] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
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Iota Sagittarii (Iota Sgr, ι Sagittarii, ι Sgr) is a star in the zodiac constellation of Sagittarius. With an apparent visual magnitude of +4.118, it is bright enough to be viewed with the naked eye.[2] Based upon an annual parallax shift of 17.94 mas as seen from Earth,[1] this star is located 182 light years from the Sun. It is moving away from the Earth with a radial velocity of +35.8 km/s.[3]
This is a probable astrometric binary,[8] based upon proper motion data collected during the Hipparcos mission.[9] The visible component shows the spectrum of an evolved K-type giant or bright giant star with a stellar classification of K0 II-III.[3] The measured angular diameter, after correction for limb darkening, is Script error: No such module "val"..[10] At an estimated distance of this star, this yields a physical size of about 15 times the radius of the Sun.[5] It has 1.4[3] times the mass of the Sun and is radiating 87[3] times the Sun's luminosity from its photosphere at an effective temperature of about 4,594 K.[3]
References
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- ↑ Template:Cite simbad
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