45 Ophiuchi

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Star in the constellation Ophiuchus

title: "45 Ophiuchi" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["f-type-giants", "ophiuchus", "bayer-objects", "durchmusterung-objects", "flamsteed-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects"] description: "Star in the constellation Ophiuchus" topic_path: "general/f-type-giants" source: "https://en.wikipedia.org/wiki/45_Ophiuchi" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Ophiuchus ::

| name = 45 Ophiuchi |image= |image=Ophiuchus constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=45 Ophiuchi |x=456|y=998 |caption=Location of 45 Ophiuchi (circled) | epoch = J2000 | constell = Ophiuchus | ra = | dec = | appmag_v = 4.28 | class = F5III-IV | b-v = +0.40 | u-b = +0.11 | radial_v = +38.00 | prop_mo_ra = +17.08 | prop_mo_dec = −138.02 | parallax = 29.23 | p_error = 0.20 | parallax_footnote = | absmag_v = 1.61 | mass = 1.71 | radius = 3.2 | temperature = 6,750 | luminosity = 19.07 | rotational_velocity = 65.4 | gravity = 3.67 | metal_fe = +0.10 | age_gyr = | names = | Simbad = d+Oph

45 Ophiuchi is a single 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. This object is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.28. It is located approximately 111.6 light years away from the Sun based on parallax. The star is drifting further from the Earth with a heliocentric radial velocity of +38 km/s.

This object has a stellar classification of F5III-IV, matching an F-type star with a luminosity class displaying mixed traits of a subgiant and a giant star. It is 1.2 billion years old with 1.7 times the mass of the Sun and 3.2 times the Sun's radius. The star is radiating 19 times the luminosity of the Sun from its photosphere at an effective temperature of 6,750 K. It is spinning with a projected rotational velocity of 65 km/s.

References

References

  1. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
  2. {{cite XHIP. 85423
  3. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal.
  4. (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.
  5. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters.
  6. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics.
  7. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics.
  8. (March 2013). "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram". Astronomy & Astrophysics.
  9. "d Oph".
  10. (September 2008). "A catalogue of multiplicity among bright stellar systems". [[Monthly Notices of the Royal Astronomical Society]].
  11. Ian Ridpath. "Telescopium - The Telescope".

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

f-type-giantsophiuchusbayer-objectsdurchmusterung-objectsflamsteed-objectshenry-draper-catalogue-objectshipparcos-objectsbright-star-catalogue-objects