φ Ophiuchi (phi Ophiuchi)

Above the horizon. Rise: 21:02 | Tran: 1:36 | Set: 6:07

Alt: 20.74° Az: 165.49° Direction: South-South-East

φ Ophiuchi is a multiple giant star of spectral class G8 in the constellation of Ophiuchus.

φ Ophiuchi visual magnitude is 4.28. Because of its moderate brightness, φ Ophiuchi is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

DSS2 image of φ Ophiuchi. The red arrow shows the motion of φ Ophiuchi during the next 10000 years (-8.50 arcmin in Right Ascension and -5.83 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 16h 32m 35s

Declination -16° 39’ 56”

Hour Angle 23h 03m 22s

Sidereal Time 15h 35m 58s

J2000

Right Ascension 16h 31m 08s

Declination -16° 36’ 46”

Galactic Coordinates

Galactic Longitude 0.13°

Galactic Latitude 21.08°

Finder Chart

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Finder chart for φ Ophiuchi (phi Ophiuchi).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.28

Class Giant

Absolute magnitude 0.24

Spectral Type G8III

Color Index (B-V) 0.92

Temperature 4943K

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

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

Star System Properties

φ Ophiuchi is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the φ Ophiuchi double sysyem:

Main star magnitude 4.28

Secondary star magnitude 11.08

Magnitude difference 6.8

Separation 120 arcsec

Distance, Radial Speed, Proper Motion

φ Ophiuchi is distant 209.92 light years from the Sun and it is moving towards the Sun at the speed of 34 kilometers per second.

Distance (parsec) 64.39

Distance (light year) 209.92

Radial Speed -34 km/s

Proper Motion RA -0.051 arcsec/y

Proper Motion Dec -0.035"/y

Alternative Designations

Bayer designation φ Ophiuchi
(phi Ophiuchi)

Flamsteed designation 8 Ophiuchi

Henry Draper Catalogue HD148786

SAO Catalogue SAO159963

Hipparcos Catalogue HIP80894

Durchmusterung Catalogue BD-16 4298

Aitken Double Star Catalogue ADS10086

Visibility from Your Location

Today's φ Ophiuchi (phi Ophiuchi) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 106.7° RISE 21:02

Max altitude: 21.9° TRANSIT 1:36

Azimuth: 253.3° SET 6:07

Set Location

Other stars in Ophiuchus