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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:40  
clear_day Transit: 12:10  
SunsetSet: 17:41
wb_twilight Nautical TwilightWhat's Visible Now?
All Constellations » Ophiuchus » 

70 Ophiuchi

Altitude: 36.9°   Azimuth: 148.8°   Direction: South-South-East

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

70 Ophiuchi visual magnitude is 4.03. Because of its moderate brightness, 70 Ophiuchi should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of 70 Ophiuchi is 0.266 arcsec per year in Right Ascension and -1.093 arcsec per year in Declination and the associated displacement for the next 100 years is represented with the red arrow.

Image of 70 Ophiuchi star
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);

Key facts about 70 Ophiuchi

4.03
Hypergiant

70 Ophiuchi is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 36.9°
Azimuth: 148.8°
Direction: South-South-East

Celestial coordinates and finder chart of 70 Ophiuchi

70 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 70 Ophiuchi are provided in the following table:

18h 05m 27s
+02° 29’ 57”
29.91°
11.38°
Ophiuchus

The simplified sky map below shows the position of 70 Ophiuchi in the sky:

Finder chart 70 Ophiuchi star
Simplified finder chart for 70 Ophiuchi.

Visibility of 70 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 70 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: 87.5°
Max altitude: 41.0°
Azimuth: 272.5°

Distance of 70 Ophiuchi from the Sun and relative movement

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.

5.09 pc
16.58 ly
-7 km/s
0.266 arcsec/year
-1.093 arcsec/year

Spectral properties of 70 Ophiuchi

70 Ophiuchi belongs to spectral class K0 and has a luminosity class of V corresponding to a hypergiant star.

5.50
K0V
5106K

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

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

70 Ophiuchi 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:

4.03
5.83
1.8
1.9 arcsec

Alternative designations of 70 Ophiuchi

70 Ophiuchi
SAO123107
SAO123107
Gl 702 A