20 Ophiuchi

Below the horizon. Rise: 12:56 | Tran: 17:58 | Set: 23:01

Alt: -25.93° Az: 285.99° Direction: West-North-West

20 Ophiuchi is a sub-giant star of spectral class F7 in the constellation of Ophiuchus.

20 Ophiuchi visual magnitude is 4.65. Because of its moderate brightness, 20 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 20 Ophiuchi. The red arrow shows the motion of 20 Ophiuchi during the next 1000 years (1.60 arcmin in Right Ascension and -1.55 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 16h 51m 12s

Declination -10° 49’ 26”

Hour Angle 07h 53m 19s

Sideral Time 00h 44m 31s

J2000

Right Ascension 16h 49m 50s

Declination -10° 46’ 59”

Galactic Coordinates

Galactic Longitude 8.04°

Galactic Latitude 20.93°

Finder Chart

Simplified finder chart for 20 Ophiuchi.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.65

Class Sub-giant

Absolute magnitude 1.81

Spectral Type F7IV

Color Index (B-V) 0.47

Temperature 6528K

The red dot in the diagram below shows where 20 Ophiuchi is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 20 Ophiuchi. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

20 Ophiuchi is distant 120.56 light years from the Sun and it is moving towards the Sun at the speed of 1 kilometers per second.

Distance (parsec) 36.98

Distance (light year) 120.56

Radial Speed -1 km/s

Proper Motion RA 0.096 arcsec/y

Proper Motion Dec -0.093"/y

Alternative Designations

Flamsteed designation 20 Ophiuchi

Henry Draper Catalogue HD151769

SAO Catalogue SAO160118

Hipparcos Catalogue HIP82369

Durchmusterung Catalogue BD-10 4394

FK5 Catalogue 1438

Visibility from Your Location

Today's 20 Ophiuchi rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 100.8° RISE 12:56

Max altitude: 27.7° TRANSIT 17:58

Azimuth: 259.2° SET 23:01

Name:	Greenwich, UK
Latitude:	51° 28' 48.0" N
Longitude:	0° 0' 0.0" E
Timezone:	Europe/London

Location

Other stars in Ophiuchus