66 Ophiuchi

66 Ophiuchi is a variable main-sequence star in the constellation of Ophiuchus.

66 Ophiuchi visual magnitude is 4.64. Because of its moderate brightness, 66 Ophiuchi should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about 66 Ophiuchi:

Color of 66 Ophiuchi ⬤

Magnitude of 66 Ophiuchi 4.64

Class Main-sequence

VISIBILITY RIGHT NOW 66 Ophiuchi is above the horizon from Greenwich, United Kingdom [change]. Altitude: 38°.

Celestial coordinates and finder chart of 66 Ophiuchi

66 Ophiuchi is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 66 Ophiuchi are provided in the following table:

Right Ascension J2000 18h 00m 15s

Declination J2000 +04° 22’ 06”

Galactic Longitude 30.99°

Galactic Latitude 13.37°

Constellation Ophiuchus

The simplified sky map below shows the position of 66 Ophiuchi in the sky:

Simplified finder chart for 66 Ophiuchi.

Visibility of 66 Ophiuchi from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's 66 Ophiuchi rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 85.6° RISE 0:10

Max altitude: 42.9° TRANSIT 6:34

Azimuth: 274.4° SET 12:54

RIGHT NOW 66 Ophiuchi is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 66 Ophiuchi

The image below is a photograph of 66 Ophiuchi from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of 66 Ophiuchi is 0.003 arcsec per year in Right Ascension and -0.013 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of 66 Ophiuchi. The red arrow shows the motion of 66 Ophiuchi during the next 10000 years (0.50 arcmin in Right Ascension and -2.17 arcmin in declination);

Distance of 66 Ophiuchi from the Sun and relative movement

66 Ophiuchi is distant 676.35 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

Distance (parsec) 207.47 pc

Distance (light year) 676.35 ly

Heliocentric radial velocity -13 km/s

Proper Motion RA 0.003 arcsec/year

Proper Motion Dec -0.013 arcsec/year

Spectral properties of 66 Ophiuchi

66 Ophiuchi belongs to spectral class B2 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -1.94

Spectral Type B2V

Color Index (B-V) -0.03

Temperature of 66 Ophiuchi 10516K

The red dot in the diagram below shows where 66 Ophiuchi is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 66 Ophiuchi. Attribution: Richard Powell / CC BY-SA

Alternative designations of 66 Ophiuchi

Flamsteed designation 66 Ophiuchi

Henry Draper Catalogue HD164284

SAO Catalogue SAO123005

Hipparcos Catalogue HIP88149

Durchmusterung Catalogue BD+04 3570

General Catalogue of Variable Stars V2048 Oph

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Other stars in Ophiuchus