70 Ophiuchi

Above the horizon. Rise: 21:12 | Tran: 3:26 | Set: 9:37

Alt: 26.02° Az: 237.64° Direction: West-South-West

70 Ophiuchi is a multiple hypergiant star of spectral class K0 in the constellation of Ophiuchus.

70 Ophiuchi visual magnitude is 4.03. Because of its moderate brightness, 70 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 70 Ophiuchi. The red arrow shows the motion of 70 Ophiuchi during the next 100 years (0.44 arcmin in Right Ascension and -1.82 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 18h 06m 43s

Declination +02° 30’ 11”

Hour Angle 03h 17m 47s

Sidereal Time 21h 24m 30s

J2000

Right Ascension 18h 05m 27s

Declination +02° 29’ 57”

Galactic Coordinates

Galactic Longitude 29.91°

Galactic Latitude 11.38°

Finder Chart

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Finder chart for 70 Ophiuchi.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.03

Class Hypergiant

Absolute magnitude 5.50

Spectral Type K0V

Color Index (B-V) 0.86

Temperature 5106K

The red dot in the diagram below shows where 70 Ophiuchi is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 70 Ophiuchi. Attribution: Richard Powell / CC BY-SA

Star System Properties

70 Ophiuchi is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the 70 Ophiuchi double sysyem:

Main star magnitude 4.03

Secondary star magnitude 5.83

Magnitude difference 1.8

Separation 1.9 arcsec

Distance, Radial Speed, Proper Motion

70 Ophiuchi is distant 16.58 light years from the Sun and it is moving towards the Sun at the speed of 7 kilometers per second.

Distance (parsec) 5.09

Distance (light year) 16.58

Radial Speed -7 km/s

Proper Motion RA 0.266 arcsec/y

Proper Motion Dec -1.093"/y

Alternative Designations

Flamsteed designation 70 Ophiuchi

Henry Draper Catalogue HD165341

SAO Catalogue SAO123107

Hipparcos Catalogue HIP88601

Durchmusterung Catalogue BD+02 3482

Gliese Catalogue Gl 702 A

Aitken Double Star Catalogue ADS11046

Visibility from Your Location

Today's 70 Ophiuchi rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 87.5° RISE 21:12

Max altitude: 41.0° TRANSIT 3:26

Azimuth: 272.5° SET 9:37

Set Location

Other stars in Ophiuchus