66 Ophiuchi

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66 Ophiuchi
Ophiuchus constellation map.svg
Red circle.svg
Location of 66 Ophiuchi (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Ophiuchus
Right ascension 18h 00m 15.79825s [1]
Declination 04° 22′ 07.0163″ [1]
Apparent magnitude  (V)4.60 [2]
Characteristics
Evolutionary stage main sequence
Spectral type B2Ve [3]
U−B color index −0.81 [2]
B−V color index −0.02 [2]
Variable type γ Cas [4]
Astrometry
Radial velocity (Rv)−12.80 [5]  km/s
Proper motion (μ)RA: +1.23 [1]   mas/yr
Dec.: −12.73 [1]   mas/yr
Parallax (π)5.01 ± 0.26  mas [1]
Distance 650 ± 30  ly
(200 ± 10  pc)
Absolute magnitude  (MV)−2.8 + −0.2 [6]
Orbit [6]
Period (P)23421.1 ± 4.1 d
Semi-major axis (a)178.36 ± 1.37 mas
Eccentricity (e)0.142 ± 0.006
Inclination (i)75.90 ± 0.69°
Longitude of the node (Ω)338.87 ± 0.31°
Periastron epoch (T)JD 2452658.5 ± 50.2
Argument of periastron (ω)
(secondary)		115.24 ± 0.95°
Details
66 Oph A
Mass 9.6 [6]   M☉
Luminosity 1524.63 [7]   L☉
Surface gravity (log g)3.69 [8]   cgs
Temperature 22,000 [9]   K
Metallicity [Fe/H]0.00 [8]   dex
Rotational velocity (v sin i)250 [10]  km/s
Age 14.0±3.2 [11]   Myr
66 Oph B
Mass 3.8 [6]   M☉
Other designations
66 Oph, V2048 Oph, BD+04°3570, GC  24500, HD  164284, HIP  88149, HR  6712, SAO  123005, WDS J18003+0422AB [12]
Database references
SIMBAD data

66 Ophiuchi is a binary [6] variable star [13] in the equatorial constellation of Ophiuchus. It has the variable star designation V2048 Ophiuchi, while 66 Ophiuchi is the Flamsteed designation. This object is visible to the naked eye as a faint, blue-white hued point of light with a baseline apparent visual magnitude of 4.60. [2] It is located approximately 650  light years away from the Sun based on parallax, [1] but is drifting closer with a radial velocity of −13 km/s. [5] The star has a peculiar velocity of 13.1±3.2 km/s [14] relative to its neighbors.

A visual band light curve for V2048 Ophiuchi, adapted from Floquet et al. (2002) V2048OphLightCurve.png
A visual band light curve for V2048 Ophiuchi, adapted from Floquet et al. (2002)

The primary star, known as 66 Ophiuchi A, is a main sequence Be star with a stellar classification of B2Ve. [3] Be stars are rapidly rotating stars that eject gas from their equators due to their rotation, forming disks that produce emission lines. 66 Ophiuchi A's disk extends out to 115 R☉. [15] Like many other Be stars, it is a γ Cas variable; a shell star with a circumstellar disc of gas and is exhibiting irregular changes in brightness, ranging from 4.85 up to 4.55 magnitude. [4] The star is 14 million years old with 9.6 [6] times the Sun's mass and is spinning rapidly with a projected rotational velocity of 250 km/s. [10] It is radiating 1,525 [7] times the Sun's luminosity from its photosphere at an effective temperature of 22,000 K. [9] Because of its rotation, it has a polar equatorial radius 4.50 that of the Sun, but an equatorial radius 5.11 that of the Sun. [15]

A magnitude 6.5 visual companion at an angular separation of 0.1″ has been reported, and is known as 66 Ophiuchi B. [16] It is 2.61 magnitudes fainter than the primary. This corresponds to a mass of about 3.8 times that of the Sun, and a spectral class of about B8. [6]

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<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">Psi Ophiuchi</span> Star in the constellation Ophiuchus

Psi Ophiuchi, which is Latinized from ψ Ophiuchi, is a single star in the equatorial constellation of Ophiuchus, next to the western constellation border with Scorpius. It has an orange hue and is visible to the naked eye as a faint point of light with an apparent visual magnitude of 4.50. It is approximately 199 light-years from Earth, based on parallax.

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

Omega Ophiuchi, which is Latinized from ω Ophiuchi, is a single, variable star in the equatorial constellation of Ophiuchus, located just to the north of the ecliptic near the western constellation border with Scorpius. It is a white-hued star that is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 4.45. Parallax measurements indicate it lies at a distance of about 168.6 light years from the Sun. It is drifting further away with a radial velocity of +2.5 km/s.

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68 Ophiuchi is a binary star system in the equatorial constellation of Ophiuchus. It is visible to the naked eye as a faint star with an apparent visual magnitude of 4.42. The system is located around 89.69 parsecs (292.5 ly) distant from the Sun, based on parallax, and is drifting further away with a radial velocity of +6 km/s.

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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">45 Ophiuchi</span> Star in the constellation Ophiuchus

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.

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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.

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<span class="mw-page-title-main">74 Ophiuchi</span> Star in the constellation Ophiuchus

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<span class="mw-page-title-main">42 Persei</span> Binary star system in the constellation Perseus

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References

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  6. 1 2 3 4 5 6 7 Hutter, D. J.; Tycner, C.; Zavala, R. T.; Benson, J. A.; Hummel, C. A.; Zirm, H. (2021). "Surveying the Bright Stars by Optical Interferometry. III. A Magnitude-limited Multiplicity Survey of Classical Be Stars". The Astrophysical Journal Supplement Series. 257 (2): 69. arXiv: 2109.06839 . Bibcode:2021ApJS..257...69H. doi: 10.3847/1538-4365/ac23cb . S2CID   237503492.
  7. 1 2 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
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  9. 1 2 Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv: 1003.2335 . Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. S2CID   111387483. Vizier catalog entry
  10. 1 2 Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi: 10.1086/340590 .
  11. ↑ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv: 1007.4883 . Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID   118629873. Vizier catalog entry
  12. ↑ "66 Oph". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-06-21.
  13. 1 2 Floquet, M.; et al. (October 2002). "Variability and pulsations in the Be star 66 Ophiuchi" (PDF). Astronomy and Astrophysics. 394: 137–149. Bibcode:2002A&A...394..137F. doi: 10.1051/0004-6361:20021105 .
  14. ↑ Bobylev, V. V.; Bajkova, A. T. (August 2013). "Galactic kinematics from a sample of young massive stars". Astronomy Letters. 39 (8): 532–549. arXiv: 1307.1677 . Bibcode:2013AstL...39..532B. doi:10.1134/S106377371308001X. S2CID   118568203.
  15. 1 2 Marr, K. C.; Jones, C. E.; Carciofi, A. C.; Rubio, A. C.; Mota, B. C.; Ghoreyshi, M. R.; Hatfield, D. W.; Rímulo, L. R. (2021). "The be Star 66 Ophiuchi: 60 Years of Disk Evolution". The Astrophysical Journal. 912 (1): 76. arXiv: 2103.06948 . Bibcode:2021ApJ...912...76M. doi: 10.3847/1538-4357/abed4c . ISSN   0004-637X. S2CID   232223272.
  16. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 . Vizier catalog entry
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