45 Ophiuchi

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45 Ophiuchi
Ophiuchus constellation map.svg
Red circle.svg
Location of 45 Ophiuchi (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Ophiuchus [1]
Right ascension 17h 27m 21.27571s [2]
Declination −29° 52′ 01.3262″ [2]
Apparent magnitude  (V)4.28 [1]
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 [2] mas/yr
Dec.: −138.02 [2] mas/yr
Parallax (π)29.23±0.20  mas [2]
Distance 111.6 ± 0.8  ly
(34.2 ± 0.2  pc)
Absolute magnitude  (MV)1.61 [1]
Details
Mass 1.71 [6]   M☉
Radius 3.2 [6]   R☉
Luminosity 19.07 [1]   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
d Oph, 45 Oph, CD−29°13557, FK5 646, GC 23627, HD 157919, HIP 85423, HR 6492, SAO 185412 [9]
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. [1] It is located approximately 111.6  light years away from the Sun based on parallax. [2] 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 [1] 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. 1 2 3 4 5 6 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.
  2. 1 2 3 4 5 6 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
  3. 1 2 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. arXiv: astro-ph/0603770 . Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID   119476992.
  4. 1 2 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. 1 2 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.
  6. 1 2 3 4 5 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
  7. 1 2 3 4 5 Pace, G. (March 2013). "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram". Astronomy & Astrophysics. 551: 4. arXiv: 1301.5651 . Bibcode:2013A&A...551L...8P. doi:10.1051/0004-6361/201220364. S2CID   56420519. L8.
  8. 1 2 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. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. S2CID   54046583. Vizier catalog entry
  9. ↑ "d Oph". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-06-22.
  10. ↑ 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.
  11. ↑ Ian Ridpath. "Telescopium - The Telescope". Ian Ridpath's Star Tales. Retrieved 2019-06-23.
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