  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 16h 54m 00.47151s [1] |
| Declination | 10° 09′ 55.2982″ [1] |
| Apparent magnitude (V) | 4.39 [2] |
| Characteristics | |
| Evolutionary stage | main sequence [3] |
| Spectral type | B8V [4] |
| U−B color index | −0.32 [5] |
| B−V color index | −0.08 [5] |
| Astrometry | |
| Radial velocity (Rv) | −19.0±1.6 [6] km/s |
| Proper motion (μ) |
RA: −53.80
[1]
mas/
yr Dec.: −34.04 [1] mas/ yr |
| Parallax (π) | 13.30 ± 0.22 mas [1] |
| Distance | 245 ± 4
ly (75 ± 1 pc) |
| Absolute magnitude (MV) | 0.01 [2] |
| Details | |
| Mass | 3.14±0.03 [3] M☉ |
| Radius | 2.8 [7] R☉ |
| Luminosity | 141+6 −5 [3] L☉ |
| Surface gravity (log g) | 4.03 [8] cgs |
| Temperature | 11,220±78 [3] K |
| Metallicity [Fe/H] | +0.09 [8] dex |
| Rotational velocity (v sin i) | 124 [3] km/s |
| Age | 217 [9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
ι Ophiuchi, Latinized as Iota Ophiuchi, is a single [11] star in the equatorial constellation of Ophiuchus, positioned near the constellation border with Hercules. It makes a naked-eye double with nearby Kappa Ophiuchi, [12] appearing as a faint, blue-white hued star with an apparent visual magnitude of 4.39. [2] The star is approximately 245 light years from the Sun based on parallax, [1] but is drifting closer with a radial velocity of −19 km/s. [6]
This object is a B-type main-sequence star with a stellar classification of B8V. [4] It is an estimated 217 [9] million years old with a moderately high rate of spin, showing a projected rotational velocity of 124 km/s. [3] The star has 3.1 [3] times the mass of the Sun and around 2.8 [7] times the Sun's radius. Iota Ophiuchi is radiating 141 [3] times the luminosity of the Sun from its photosphere at an effective temperature of 11,220 K. [3] It displays an infrared excess, suggesting the presence of circumstellar material. [13]
References
- ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752. Bibcode: 2007A&A...474..653V. doi: 10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
- ^ a b c 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. S2CID 119257644. Vizier catalog entry
- ^ a b c d e f g h i Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052. Bibcode: 2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691. S2CID 55586789. Vizier catalog entry
- ^ a b Cowley, A. (November 1972). "Spectral classification of the bright B8 stars". Astronomical Journal. 77: 750–755. Bibcode: 1972AJ.....77..750C. doi: 10.1086/111348.
- ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode: 2014JAVSO..42..443M. Vizier catalog entry
- ^ a b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053. Bibcode: 2006AstL...32..759G. doi: 10.1134/S1063773706110065. S2CID 119231169.
- ^ a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002. Bibcode: 1999A&A...352..555A. Vizier catalog entry
- ^ a b Wu, Yue; et al. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv: 1009.1491. Bibcode: 2011A&A...525A..71W. doi: 10.1051/0004-6361/201015014. S2CID 53480665.
- ^ a b Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters. 38 (11): 694–706. arXiv: 1606.09028. Bibcode: 2012AstL...38..694G. doi: 10.1134/S1063773712110035. S2CID 119108982.
- ^ "iot Oph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-05.
- ^ 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.
- ^ Arnold, H. J. P.; et al. (1999). The Photographic Atlas of the Stars. CRC Press. p. 156. ISBN 9780750306546.
- ^ McDonald, I.; et al. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv: 1208.2037. Bibcode: 2012MNRAS.427..343M. doi: 10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 16h 54m 00.47151s [1] |
| Declination | 10° 09′ 55.2982″ [1] |
| Apparent magnitude (V) | 4.39 [2] |
| Characteristics | |
| Evolutionary stage | main sequence [3] |
| Spectral type | B8V [4] |
| U−B color index | −0.32 [5] |
| B−V color index | −0.08 [5] |
| Astrometry | |
| Radial velocity (Rv) | −19.0±1.6 [6] km/s |
| Proper motion (μ) |
RA: −53.80
[1]
mas/
yr Dec.: −34.04 [1] mas/ yr |
| Parallax (π) | 13.30 ± 0.22 mas [1] |
| Distance | 245 ± 4
ly (75 ± 1 pc) |
| Absolute magnitude (MV) | 0.01 [2] |
| Details | |
| Mass | 3.14±0.03 [3] M☉ |
| Radius | 2.8 [7] R☉ |
| Luminosity | 141+6 −5 [3] L☉ |
| Surface gravity (log g) | 4.03 [8] cgs |
| Temperature | 11,220±78 [3] K |
| Metallicity [Fe/H] | +0.09 [8] dex |
| Rotational velocity (v sin i) | 124 [3] km/s |
| Age | 217 [9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
ι Ophiuchi, Latinized as Iota Ophiuchi, is a single [11] star in the equatorial constellation of Ophiuchus, positioned near the constellation border with Hercules. It makes a naked-eye double with nearby Kappa Ophiuchi, [12] appearing as a faint, blue-white hued star with an apparent visual magnitude of 4.39. [2] The star is approximately 245 light years from the Sun based on parallax, [1] but is drifting closer with a radial velocity of −19 km/s. [6]
This object is a B-type main-sequence star with a stellar classification of B8V. [4] It is an estimated 217 [9] million years old with a moderately high rate of spin, showing a projected rotational velocity of 124 km/s. [3] The star has 3.1 [3] times the mass of the Sun and around 2.8 [7] times the Sun's radius. Iota Ophiuchi is radiating 141 [3] times the luminosity of the Sun from its photosphere at an effective temperature of 11,220 K. [3] It displays an infrared excess, suggesting the presence of circumstellar material. [13]
References
- ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752. Bibcode: 2007A&A...474..653V. doi: 10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
- ^ a b c 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. S2CID 119257644. Vizier catalog entry
- ^ a b c d e f g h i Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052. Bibcode: 2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691. S2CID 55586789. Vizier catalog entry
- ^ a b Cowley, A. (November 1972). "Spectral classification of the bright B8 stars". Astronomical Journal. 77: 750–755. Bibcode: 1972AJ.....77..750C. doi: 10.1086/111348.
- ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode: 2014JAVSO..42..443M. Vizier catalog entry
- ^ a b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053. Bibcode: 2006AstL...32..759G. doi: 10.1134/S1063773706110065. S2CID 119231169.
- ^ a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002. Bibcode: 1999A&A...352..555A. Vizier catalog entry
- ^ a b Wu, Yue; et al. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv: 1009.1491. Bibcode: 2011A&A...525A..71W. doi: 10.1051/0004-6361/201015014. S2CID 53480665.
- ^ a b Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters. 38 (11): 694–706. arXiv: 1606.09028. Bibcode: 2012AstL...38..694G. doi: 10.1134/S1063773712110035. S2CID 119108982.
- ^ "iot Oph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-05.
- ^ 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.
- ^ Arnold, H. J. P.; et al. (1999). The Photographic Atlas of the Stars. CRC Press. p. 156. ISBN 9780750306546.
- ^ McDonald, I.; et al. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv: 1208.2037. Bibcode: 2012MNRAS.427..343M. doi: 10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
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