Astronomy:Iota Crucis
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 45m 38.05167s[1] |
| Declination | −60° 58′ 52.7563″[1] |
| Apparent magnitude (V) | 4.69[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| U−B color index | +0.93[4] |
| B−V color index | +1.05[4] |
| Astrometry | |
| Radial velocity (Rv) | +7.45±0.12[5] km/s |
| Proper motion (μ) | RA: +112.266[1] mas/yr Dec.: −65.641[1] mas/yr |
| Parallax (π) | 26.1753 ± 0.0952[1] mas |
| Distance | 124.6 ± 0.5 ly (38.2 ± 0.1 pc) |
| Absolute magnitude (MV) | +1.86[2] |
| Details[6] | |
| Mass | 1.45±0.11 M☉ |
| Radius | 6.57±0.19 R☉ |
| Luminosity | 20.9±0.5 L☉ |
| Surface gravity (log g) | 2.920±0.149 cgs |
| Temperature | 4,815±60 K |
| Metallicity [Fe/H] | +0.148±0.038 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
ι Crucis, Latinized as Iota Crucis, is a star in the southern constellation of Crux.[7] It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4m.69.[2] This object is located 125 light-years from the Sun, based on parallax, and is drifting further away with a radial velocity of +7.5 km/s.[5]
This is an aging giant star with a stellar classification of K0 III.[3] It has 1.45 times the mass of the Sun. Having exhausted the supply of hydrogen at its core, the star has cooled and expanded off the main sequence, and now has 6.57 times the radius of the Sun. It is radiating 20.9 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,815 K.[6]
There is a magnitude 10.24 star named CPD-60 4273B (B8V) at an angular separation of 29.7″ from the primary, along a position angle of 2° as of 2015. The Washington Double Star Catalog (2001) notes this is an "optical pair, based on study of relative motion of the components,"[8] whereas Eggleton and Tokovinin (2008) list it as a binary system.[9] However, astrometric measurements by the Gaia spacecraft confirm the companion is not gravitationally bound, with a measured parallax of 1.1416±0.0162 mas implying a distance around 876 pc (2,860 ly), as well as radically different proper motions.[10]
References
- ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H
- ↑ 4.0 4.1 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 5.0 5.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 6.0 6.1 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V. et al. (2022-01-01), "CORALIE radial-velocity search for companions around evolved stars (CASCADES). I. Sample definition and first results: Three new planets orbiting giant stars", Astronomy and Astrophysics 657: A87, doi:10.1051/0004-6361/202040078, ISSN 0004-6361, Bibcode: 2022A&A...657A..87O.
- ↑ 7.0 7.1 "iot Cru". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=iot+Cru.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
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