Iota Ophiuchi
Appearance
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 | |
Spectral type | B8V[3] |
U−B color index | -0.32[4] |
B−V color index | -0.08[4] |
Astrometry | |
Radial velocity (Rv) | -19.00[5] 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[6] M☉ |
Radius | 2.8[7] R☉ |
Luminosity | 140[6] L☉ |
Surface gravity (log g) | 4.03[8] cgs |
Temperature | 11,220[6] K |
Metallicity [Fe/H] | +0.09[8] dex |
Rotational velocity (v sin i) | 124[6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Iota Ophiuchi (ι Oph) is a class B8V[3] (blue main-sequence) star in the constellation Ophiuchus. Its apparent magnitude is 4.39[2] and it is approximately 245 light years away based on parallax.[1]
References
- ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 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. Vizier catalog entry
- ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
- ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
- ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- ^ a b c d 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. Vizier catalog entry
- ^ 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. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
- ^ a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (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.