Iota Crucis
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Crux[1] |
| Right ascension | 12h 45m 38.05167s[2] |
| Declination | −60° 58′ 52.7563″[2] |
| Apparent magnitude (V) | 4.69[1] |
| 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 mas/yr[2] Dec.: −65.641 mas/yr[2] |
| Parallax (π) | 26.1753±0.0952 mas[2] |
| Distance | 124.6 ± 0.5 ly (38.2 ± 0.1 pc) |
| Absolute magnitude (MV) | +1.86[1] |
| 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 | |
| ι Cru, CPD−60°4273, GC 17339, HD 110829, HIP 62268, HR 4842, SAO 252016, WDS J12456-6059A[7] | |
| Database references | |
| SIMBAD | data |
Iota Crucis is a star in the southern constellation of Crux.[1] Its name is a Bayer designation that is Latinized from ι Crucis and abbreviated ι Cru or ι Cru. This star is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.69.[1] It is located at a distance of 124.6 light-years (38.2 pc) from the Sun based on parallax measurements, 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 2 3 4 5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015 XHIP record for this object at VizieR.
- 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875 Gaia DR3 record for this source at VizieR.
- 1 2 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H
- 1 2 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.
- 1 2 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018), "Gaia Data Release 2: Summary of the contents and survey properties", Astronomy & Astrophysics, 616, A1, arXiv:1804.09365, Bibcode:2018A&A...616A...1G, doi:10.1051/0004-6361/201833051 Gaia DR2 record for this source at VizieR.
- 1 2 Ottoni, G.; et al. (January 2022), "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, arXiv:2201.01528, Bibcode:2022A&A...657A..87O, doi:10.1051/0004-6361/202040078, ISSN 0004-6361.
- ↑ "iot Cru", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2019-09-04
- ↑ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
- ↑ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ↑ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
