ι Ophiuchi (iota Ophiuchi)

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

ι Ophiuchi visual magnitude is 4.38. Because of its moderate brightness, ι 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 ι Ophiuchi:

Color of ι Ophiuchi ⬤

Magnitude of ι Ophiuchi 4.38

Class Main-sequence

VISIBILITY RIGHT NOW ι Ophiuchi (iota Ophiuchi) is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 33°.

Celestial coordinates and finder chart of ι Ophiuchi

ι 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 ι Ophiuchi are provided in the following table:

Right Ascension J2000 16h 54m 00s

Declination J2000 +10° 09’ 55”

Galactic Longitude 28.73°

Galactic Latitude 30.66°

Constellation Ophiuchus

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

Finder chart ι Ophiuchi (iota Ophiuchi) star

Simplified finder chart for ι Ophiuchi (iota Ophiuchi).

Visibility of ι Ophiuchi from your location

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

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

Azimuth: 79.8° RISE 18:19

Max altitude: 48.7° TRANSIT 1:13

Azimuth: 280.2° SET 8:02

RIGHT NOW ι Ophiuchi (iota Ophiuchi) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of ι Ophiuchi

The image below is a photograph of ι 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 ι Ophiuchi is -0.051 arcsec per year in Right Ascension and -0.036 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ι Ophiuchi (iota Ophiuchi) star

DSS2 image of ι Ophiuchi. The red arrow shows the motion of ι Ophiuchi during the next 10000 years (-8.50 arcmin in Right Ascension and -6.00 arcmin in declination);

Distance of ι Ophiuchi from the Sun and relative movement

ι Ophiuchi is distant 233.69 light years from the Sun and it is moving towards the Sun at the speed of 21 kilometers per second.

Distance (parsec) 71.68 pc

Distance (light year) 233.69 ly

Heliocentric radial velocity -21 km/s

Proper Motion RA -0.051 arcsec/year

Proper Motion Dec -0.036 arcsec/year

Spectral properties of ι Ophiuchi

ι Ophiuchi belongs to spectral class B8 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude 0.10

Spectral Type B8V

Color Index (B-V) -0.08

Temperature of ι Ophiuchi 11247K

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

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

Alternative designations of ι Ophiuchi

Bayer designation ι Ophiuchi
(iota Ophiuchi)

Flamsteed designation 25 Ophiuchi

Henry Draper Catalogue HD152614

SAO Catalogue SAO102458

Hipparcos Catalogue HIP82673

Durchmusterung Catalogue BD+10 3092

FK5 Catalogue 1442

General Catalogue of Variable Stars 8034

In Evidence

Other stars in Ophiuchus