12 Ophiuchi

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

12 Ophiuchi visual magnitude is 5.75. Because of its reltive faintness, 12 Ophiuchi should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 12 Ophiuchi:

Color of 12 Ophiuchi ⬤

Magnitude of 12 Ophiuchi 5.75

Class Main-sequence

VISIBILITY RIGHT NOW 12 Ophiuchi is above the horizon from Greenwich, United Kingdom [change]. Altitude: 5°.

Celestial coordinates and finder chart of 12 Ophiuchi

12 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 12 Ophiuchi are provided in the following table:

Right Ascension J2000 16h 36m 21s

Declination J2000 -02° 19’ 28”

Galactic Longitude 13.73°

Galactic Latitude 28.42°

Constellation Ophiuchus

The simplified sky map below shows the position of 12 Ophiuchi in the sky:

Simplified finder chart for 12 Ophiuchi.

Visibility of 12 Ophiuchi from your location

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

Today's 12 Ophiuchi rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 92.3° RISE 23:12

Max altitude: 36.2° TRANSIT 5:03

Azimuth: 267.7° SET 10:49

RIGHT NOW 12 Ophiuchi is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 12 Ophiuchi

The image below is a photograph of 12 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 12 Ophiuchi is 0.458 arcsec per year in Right Ascension and -0.31 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of 12 Ophiuchi. The red arrow shows the motion of 12 Ophiuchi during the next 1000 years (7.63 arcmin in Right Ascension and -5.17 arcmin in declination);

Distance of 12 Ophiuchi from the Sun and relative movement

12 Ophiuchi is distant 31.88 light years from the Sun and it is moving towards the Sun at the speed of 15 kilometers per second.

Distance (parsec) 9.78 pc

Distance (light year) 31.88 ly

Heliocentric radial velocity -15 km/s

Proper Motion RA 0.458 arcsec/year

Proper Motion Dec -0.31 arcsec/year

Spectral properties of 12 Ophiuchi

12 Ophiuchi belongs to spectral class K2 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude 5.80

Spectral Type K2V

Color Index (B-V) 0.82

Temperature of 12 Ophiuchi 5221K

The red dot in the diagram below shows where 12 Ophiuchi is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 12 Ophiuchi. Attribution: Richard Powell / CC BY-SA

Alternative designations of 12 Ophiuchi

Flamsteed designation 12 Ophiuchi

Henry Draper Catalogue HD149661

SAO Catalogue SAO141269

Hipparcos Catalogue HIP81300

Durchmusterung Catalogue BD-02 4211

Gliese Catalogue Gl 631

FK5 Catalogue 1433

General Catalogue of Variable Stars V2133 Oph

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Other stars in Ophiuchus