Iota Pictoris
Star in the constellation Pictor
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ι Pictoris, Latinized from Iota Pictoris, is a suspected multiple star system[6] in the southern Pictor constellation. It is visible to the naked eye as a dim, yellow-white-hued point of light with a combined apparent visual magnitude of 5.28.[6] The two resolvable components have an angular separation of 8.2 arcseconds, equivalent to a physical projected separation of around 450 AU.[7] They are located at a distance of around 127–131 light-years from the Sun, based on parallax.[1]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pictor |
| ι Pic A | |
| Right ascension | 04h 50m 55.32684s[1] |
| Declination | −53° 27′ 41.2300″[1] |
| Apparent magnitude (V) | 5.63[2] |
| ι Pic B | |
| Right ascension | 04h 50m 56.49825s[1] |
| Declination | −53° 27′ 34.9159″[1] |
| Apparent magnitude (V) | 6.47[2] |
| Characteristics | |
| ι Pic A | |
| Spectral type | F0 V[2] |
| U−B color index | 0.06[2] |
| B−V color index | 0.32[2] |
| ι Pic B | |
| Spectral type | F4 V[2] |
| B−V color index | 0.37[2] |
| Astrometry | |
| ι Pic A | |
| Radial velocity (Rv) | 8.6±3.4[3] km/s |
| Proper motion (μ) | RA: −98.707[1] mas/yr Dec.: +80.769[1] mas/yr |
| Parallax (π) | 24.9211±0.1559 mas[1] |
| Distance | 130.9 ± 0.8 ly (40.1 ± 0.3 pc) |
| Absolute magnitude (MV) | 2.50[2] |
| ι Pic B | |
| Radial velocity (Rv) | 23.3±1.0[3] km/s |
| Proper motion (μ) | RA: −98.707[1] mas/yr Dec.: +66.139[1] mas/yr |
| Parallax (π) | 25.6610±0.4106 mas[1] |
| Distance | 127 ± 2 ly (39.0 ± 0.6 pc) |
| Absolute magnitude (MV) | 3.30[2] |
| Details | |
| ι Pic A | |
| Mass | 1.51[4] M☉ |
| Radius | 1.80+0.23 −0.11[1] R☉ |
| Luminosity | 7.2±0.1[1] L☉ |
| Surface gravity (log g) | 4.28±0.14[4] cgs |
| Temperature | 7,331±249[4] K |
| Age | 696[4] Myr |
| ι Pic B | |
| Mass | 2.76[4] M☉ |
| Radius | 1.48+0.04 −0.06[1] R☉ |
| Luminosity | 3.4±0.06[1] L☉ |
| Surface gravity (log g) | 4.24±0.14[4] cgs |
| Temperature | 6,435±219[4] K |
| Age | 516[4] Myr |
| Other designations | |
| ι Pic, CPD−53°760, WDS J04509-5328AB[5] | |
| ι Pic A: HD 31203, HIP 22531, HR 1563, SAO 233709 | |
| ι Pic B: HD 31204, HIP 22534, HR 1564, SAO 233710 | |
| Database references | |
| SIMBAD | data |
The two visible components appear as F-type main-sequence stars: the magnitude 5.63 component A has a stellar classification of F0 V, while the cooler, fainter secondary is of class F4 V.[2] Both are themselves are suspected spectroscopic binary stars consisting of roughly equal components.[6] Component B actually has a higher estimated mass than Component A, although the radius of B is smaller. They are both more luminous than the Sun, and have an estimated age of around 500–600 million years.[4]