Astronomy:45 Ophiuchi
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 17h 27m 21.27571s[1] |
| Declination | −29° 52′ 01.3262″[1] |
| Apparent magnitude (V) | 4.28[2] |
| Characteristics | |
| Spectral type | F5III-IV[3] |
| U−B color index | +0.11[4] |
| B−V color index | +0.40[4] |
| Astrometry | |
| Radial velocity (Rv) | +38.00[5] km/s |
| Proper motion (μ) | RA: +17.08[1] mas/yr Dec.: -138.02[1] mas/yr |
| Parallax (π) | 29.23 ± 0.20[1] mas |
| Distance | 111.6 ± 0.8 ly (34.2 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.61[2] |
| Details | |
| Mass | 1.71[6] M☉ |
| Radius | 3.2[6] R☉ |
| Luminosity | 19.07[2] L☉ |
| Surface gravity (log g) | 3.67[6] cgs |
| Temperature | 6,750[7] K |
| Metallicity [Fe/H] | +0.10[7] dex |
| Rotational velocity (v sin i) | 65.4[8] km/s |
| Age | 1.24±0.18[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
45 Ophiuchi is a single[10] star in the equatorial constellation of Ophiuchus, along the southern border with Scorpius. It has the Bayer designation d Ophiuchi, while 45 Ophiuchi is the Flamsteed designation. In the past it had the designation Theta Telescopii.[11] This object is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.28.[2] It is located approximately 111.6 light years away from the Sun based on parallax.[1] The star is drifting further from the Earth with a heliocentric radial velocity of +38 km/s.[5]
This object has a stellar classification of F5III-IV,[3] matching an F-type star with a luminosity class displaying mixed traits of a subgiant and a giant star. It is 1.2[7] billion years old with 1.7[6] times the mass of the Sun and 3.2[6] times the Sun's radius. The star is radiating 19[2] times the luminosity of the Sun from its photosphere at an effective temperature of 6,750 K.[7] It is spinning with a projected rotational velocity of 65 km/s.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ 3.0 3.1 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie 2168. Bibcode: 2006yCat.2168....0M.Vizier catalog entry
- ↑ 5.0 5.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 6.0 6.1 6.2 6.3 6.4 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. Bibcode: 1999A&A...352..555A. Vizier catalog entry
- ↑ 7.0 7.1 7.2 7.3 7.4 Pace, G. (March 2013). "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram". Astronomy & Astrophysics 551: 4. doi:10.1051/0004-6361/201220364. L8. Bibcode: 2013A&A...551L...8P.
- ↑ 8.0 8.1 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D. Vizier catalog entry
- ↑ "d Oph". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=d+Oph.
- ↑ 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.
- ↑ Ian Ridpath. "Telescopium - The Telescope". http://www.ianridpath.com/startales/telescopium.htm.
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