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">44 Ophiuchi</span> Star in the constellation Ophiuchus

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<span class="mw-page-title-main">30 Ophiuchi</span> Star in the constellation Ophiuchus

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