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
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  mas [1]
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
d Oph, 45 Oph, CD−29 135575, 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. [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]

Related Research Articles

<span class="mw-page-title-main">Mu Ophiuchi</span> Star in the constellation Ophiuchus

μ Ophiuchi, Latinized as Mu Ophiuchi, is a solitary, blue-white hued star in the equatorial constellation of Ophiuchus. It is visible to the naked as a faint point of light with an apparent visual magnitude of 4.62. This object is located approximately 760 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −18.5 km/s.

<span class="mw-page-title-main">Epsilon Monocerotis</span> Binary star system in the constellation Monoceros

ε Monocerotis, Latinised as Epsilon Monocerotis, is the Bayer designation of a binary star system in the equatorial constellation Monoceros. Its location is a guide for sky navigation toward the Rosette Nebula.

<span class="mw-page-title-main">10 Leonis Minoris</span> Star in the constellation Leo Minor

10 Leonis Minoris is a single variable star in the northern constellation Leo Minor, located approximately 191 light years away based on parallax. It has the variable star designation SU Leonis Minoris; 10 Leonis Minoris is the Flamsteed designation. This body is visible to the naked eye as a faint, orange-hued star with a baseline apparent visual magnitude of 4.54. It is moving closer to the Earth with a heliocentric radial velocity of −12 km/s.

<span class="mw-page-title-main">28 Monocerotis</span> Star in the constellation Monoceros

28 Monocerotis is a single star in the equatorial constellation of Monoceros. It has an orange-hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.69. The distance to this star is approximately 450 light years based on parallax, and it has an absolute magnitude of −1.00. The star is drifting further away from the Sun with a radial velocity of +26.7 km/s.

<span class="mw-page-title-main">44 Ophiuchi</span> Star in the constellation Ophiuchus

44 Ophiuchi is a single star in the constellation Ophiuchus. It has the Bayer designation b Ophiuchi, while 44 Ophiuchi is the Flamsteed designation. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.16. The distance to this object is approximately 83.2 light years based on parallax. It is drifting closer to the Earth with a heliocentric radial velocity of -37.2 km/s, and is predicted to come within 30 light-years around 585,000 years from now.

<span class="mw-page-title-main">Phi Ophiuchi</span> Single star in the constellation Ophiuchus

Phi Ophiuchi, a name Latinized from φ Ophiuchi, is a single star in the equatorial constellation of Ophiuchus. It has a yellow hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.27. The star is located at a distance of approximately 244 light-years from the Sun based on parallax, but it is drifting closer with a radial velocity of −33.5 km/s.

<span class="mw-page-title-main">Sigma Ophiuchi</span> Star in the constellation Ophiuchus

Sigma Ophiuchi, Latinized from σ Ophiuchi, is a single, orange-hued star in the equatorial constellation Ophiuchus. Its apparent visual magnitude is 4.31, which is bright enough to be faintly visible to the naked eye. The annual parallax shift of 3.62 mas as seen from Earth provides a distance estimate of roughly 900 light years. It is moving closer to the Sun with a radial velocity of −28 km/s.

<span class="mw-page-title-main">Iota Ophiuchi</span> Star in the constellation Ophiuchus

ι Ophiuchi, Latinized as Iota Ophiuchi, is a single star in the equatorial constellation of Ophiuchus, positioned near the constellation border with Hercules. It makes a naked-eye double with nearby Kappa Ophiuchi, appearing as a faint, blue-white hued star with an apparent visual magnitude of 4.39. The star is approximately 245 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −19 km/s.

<span class="mw-page-title-main">20 Ophiuchi</span> Star in the constellation Ophiuchus

20 Ophiuchi is a class F6IV star in the constellation Ophiuchus. Its apparent magnitude is 4.64 and it is approximately 104 light years away based on parallax. It lies near the star Zeta Ophiuchi.

<span class="mw-page-title-main">Epsilon Pavonis</span> Star in the constellation Pavo

Epsilon Pavonis, Latinized from ε Pavonis, is a single, white-hued star in the constellation Pavo. It can be viewed with the naked eye, having an apparent visual magnitude of 3.97. The annual parallax shift of 31.04 mas provides a distance estimate of 105 light years from the Sun. This star is a member of the proposed Argus Association, a young moving group of more than 60 stars associated with the IC 2391 cluster. Epsilon Pavonis is moving closer to the Sun with a radial velocity of −6.7 km/s.

<span class="mw-page-title-main">72 Pegasi</span> Binary star system in the constellation Pegasus

72 Pegasi is a binary star system in the northern constellation of Pegasus. It is visible to the naked eye as a faint, orange-hued point of light with a combined apparent visual magnitude of 4.97. The system is located approximately 550 light years away from the Sun, based on parallax, but is drifting closer with a radial velocity of −25 km/s.

<span class="mw-page-title-main">HD 18970</span> Star in the constellation Perseus

HD 18970 is a class G9.5III star in the constellation Perseus. Its apparent magnitude is 4.77 and it is approximately 211 light years away based on parallax.

<span class="mw-page-title-main">54 Persei</span> Star in the constellation Perseus

54 Persei is a single star in the northern constellation of Perseus. It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.93. The star is located approximately 220 light years away based on parallax, but is drifting closer with a radial velocity of −27 km/s.

<span class="mw-page-title-main">11 Puppis</span> Star in the constellation Puppis

11 Puppis is a single star in the southern constellation of Puppis, located approximately 522 light years away based on parallax. It has the Bayer designation j Puppis; 11 Puppis is the Flamsteed designation. This object is visible to the naked eye as a faint, yellow-white star with an apparent visual magnitude of 4.20. It is moving further from the Earth with a heliocentric radial velocity of +13.3 km/s.

<span class="mw-page-title-main">QZ Puppis</span> Star in the constellation Puppis

QZ Puppis is a class B2.5V star in the constellation Puppis. Its apparent magnitude is 4.5 and it is approximately 650 light years away based on parallax.

<span class="mw-page-title-main">PU Puppis</span> Blue-giant star in the constellation Puppis

PU Puppis is a class B8III star in the constellation Puppis. Its apparent magnitude is 4.69 and it is approximately 620 light years away based on parallax.

<span class="mw-page-title-main">HD 61772</span> Star in the constellation Puppis

HD 61772 is a bright giant star in the constellation Puppis. Its apparent magnitude is 4.98 and it is approximately 660 light years away based on parallax.

<span class="mw-page-title-main">HD 50235</span> Star in the constellation Puppis

HD 50235 is a class K5III star located approximately 811 light years away, in the constellation Puppis. Its apparent magnitude is 4.99. HD 50235 made its closest approach to the Sun 7.8 million years ago, at the distance of 137 light years, during which it had an apparent magnitude of 1.13.

<span class="mw-page-title-main">43 Sagittarii</span> Star in the constellation of Sagittarius

43 Sagittarii is a single star in the southern constellation of Sagittarius. It has the Bayer designation d Sagittarii, while 43 Sagittarii is the Flamsteed designation. This object is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.88. From parallax measurements, it is estimated to lie around 470 light years away from the Sun. The star is drifting further from the Earth with a heliocentric radial velocity of +15.2 km/s. It is located near the ecliptic and thus is subject to lunar occultations.

Theta<sup>2</sup> Microscopii Star in the constellation Microscopium

Theta2 Microscopii is a class A0III star in the constellation Microscopium. Its apparent magnitude is 5.76 and it is approximately 390 light years away based on parallax. It is an Ap star, a chemically peculiar star with unusually strong metallic spectral lines.

References

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  2. 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. S2CID   119257644. 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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