70 Ophiuchi

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 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 70 Ophiuchi:

Color of 70 Ophiuchi ⬤

Magnitude of 70 Ophiuchi 4.03

Class Hypergiant

VISIBILITY RIGHT NOW

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

Altitude: 2.9°
Azimuth: 270.3°
Direction: West

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:

Right Ascension J2000 18h 05m 27s

Declination J2000 +02° 29’ 57”

Galactic Longitude 29.91°

Galactic Latitude 11.38°

Constellation Ophiuchus

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

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° RISE 20:02

Max altitude: 41.0° TRANSIT 2:16

Azimuth: 272.5° SET 8:27

RIGHT NOW 70 Ophiuchi is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 70 Ophiuchi

The image below is a photograph of 70 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 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.

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);

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.

Distance (parsec) 5.09 pc

Distance (light year) 16.58 ly

Heliocentric radial velocity -7 km/s

Proper Motion RA 0.266 arcsec/year

Proper Motion Dec -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.

Absolute magnitude 5.50

Spectral Type K0V

Color Index (B-V) 0.86

Temperature of 70 Ophiuchi 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

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:

Main star magnitude 4.03

Secondary star magnitude 5.83

Magnitude difference 1.8

Separation 1.9 arcsec

Alternative designations of 70 Ophiuchi

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

In Evidence

Other stars in Ophiuchus