Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Octans |
Right ascension | 12h 54m 58.80949s [1] |
Declination | −85° 07′ 24.1041″ [1] |
Apparent magnitude (V) | 5.83 + 6.75 [2] |
Characteristics | |
Spectral type | K0 III [3] |
U−B color index | +0.79 [4] |
B−V color index | +1.02 [4] |
Astrometry | |
Radial velocity (Rv) | 53.4±0.7 [5] km/s |
Proper motion (μ) |
RA: +67.20
[1]
mas/
yr Dec.: +24.76 [1] mas/ yr |
Parallax (π) | 9.27 ± 0.46 mas [1] |
Distance | 350 ± 20
ly (108 ± 5 pc) |
Absolute magnitude (MV) | +0.29 |
Details [6] | |
Mass | 2.49+1.48 −1.31 M☉ |
Radius | 12.43 [7] R☉ |
Luminosity | 81±9 L☉ |
Temperature | 4,890±110 K |
Metallicity [Fe/H] | −0.3 dex |
Rotational velocity (v sin i) | 1.9±1.3 [8] km/s |
Age | 725 [9] Myr |
Other designations | |
ι Octantis,
16 G. Octantis,
CPD−84°407,
GC 17460,
HD 111482,
HIP 63031,
HR 4870,
SAO 258654,
WDS J12550-8507AB | |
Database references | |
SIMBAD | data |
Iota Octantis, Latinized, from ι Octantis is a double star [10] in the southern circumpolar constellation Octans. The "A" component has an apparent magnitude of 5.83, [2] making it faintly visible to the naked eye under ideal conditions, but the "B" component can't be seen due to its faintness. [2] The system is located at a distance of 350 light years [1] based on its annual parallax shift, but is drifting away at a rate of 53.4 km/s. [5]
Iota Octantis A has a classification of K0 III, [3] which indicates that it is an evolved K-type star that exhausted hydrogen at its core and left the main sequence. It has an angular diameter of 1.07 arcseconds, [11] which yields a radius 12.43 times that of the Sun at its estimated distance. [7] At present Iota Octantis A has 2.49 times the mass of the Sun [6] and radiates at 81 times the luminosity of the Sun [6] from its enlarged photosphere at an effective temperature of 4,890 K, [6] which gives it an orangish-yellow hue. Iota Octantis is metal deficient [6] and spins slowly with a projected rotational velocity of 1.9 km/s. [8]
Eggleton et al. states that both stars have similar spectral types, [10] but there is a faint tenth magnitude companion with a classification of F8 located 60.1″ away, [12] which is unrelated to the two.
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Octans |
Right ascension | 12h 54m 58.80949s [1] |
Declination | −85° 07′ 24.1041″ [1] |
Apparent magnitude (V) | 5.83 + 6.75 [2] |
Characteristics | |
Spectral type | K0 III [3] |
U−B color index | +0.79 [4] |
B−V color index | +1.02 [4] |
Astrometry | |
Radial velocity (Rv) | 53.4±0.7 [5] km/s |
Proper motion (μ) |
RA: +67.20
[1]
mas/
yr Dec.: +24.76 [1] mas/ yr |
Parallax (π) | 9.27 ± 0.46 mas [1] |
Distance | 350 ± 20
ly (108 ± 5 pc) |
Absolute magnitude (MV) | +0.29 |
Details [6] | |
Mass | 2.49+1.48 −1.31 M☉ |
Radius | 12.43 [7] R☉ |
Luminosity | 81±9 L☉ |
Temperature | 4,890±110 K |
Metallicity [Fe/H] | −0.3 dex |
Rotational velocity (v sin i) | 1.9±1.3 [8] km/s |
Age | 725 [9] Myr |
Other designations | |
ι Octantis,
16 G. Octantis,
CPD−84°407,
GC 17460,
HD 111482,
HIP 63031,
HR 4870,
SAO 258654,
WDS J12550-8507AB | |
Database references | |
SIMBAD | data |
Iota Octantis, Latinized, from ι Octantis is a double star [10] in the southern circumpolar constellation Octans. The "A" component has an apparent magnitude of 5.83, [2] making it faintly visible to the naked eye under ideal conditions, but the "B" component can't be seen due to its faintness. [2] The system is located at a distance of 350 light years [1] based on its annual parallax shift, but is drifting away at a rate of 53.4 km/s. [5]
Iota Octantis A has a classification of K0 III, [3] which indicates that it is an evolved K-type star that exhausted hydrogen at its core and left the main sequence. It has an angular diameter of 1.07 arcseconds, [11] which yields a radius 12.43 times that of the Sun at its estimated distance. [7] At present Iota Octantis A has 2.49 times the mass of the Sun [6] and radiates at 81 times the luminosity of the Sun [6] from its enlarged photosphere at an effective temperature of 4,890 K, [6] which gives it an orangish-yellow hue. Iota Octantis is metal deficient [6] and spins slowly with a projected rotational velocity of 1.9 km/s. [8]
Eggleton et al. states that both stars have similar spectral types, [10] but there is a faint tenth magnitude companion with a classification of F8 located 60.1″ away, [12] which is unrelated to the two.