51 Ophiuchi

Below the horizon. Rise: 15:05 | Tran: 18:48 | Set: 22:31

Alt: -45.87° Az: 69.04° Direction: East-North-East

51 Ophiuchi is a variable main-sequence star of spectral class B9 in the constellation of Ophiuchus.

51 Ophiuchi visual magnitude is 4.81. Because of its moderate brightness, 51 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 51 Ophiuchi. The red arrow shows the motion of 51 Ophiuchi during the next 10000 years (0.67 arcmin in Right Ascension and -4.50 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 17h 32m 55s

Declination -23° 58’ 45”

Hour Angle 15h 01m 29s

Sideral Time 08h 34m 24s

J2000

Right Ascension 17h 31m 24s

Declination -23° 57’ 46”

Galactic Coordinates

Galactic Longitude 2.52°

Galactic Latitude 5.34°

Finder Chart

Simplified finder chart for 51 Ophiuchi.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.81

Class Main-sequence

Absolute magnitude -0.77

Spectral Type B9V

Color Index (B-V) 0

Temperature 10125K

The red dot in the diagram below shows where 51 Ophiuchi is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 51 Ophiuchi. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

51 Ophiuchi is distant 426.14 light years from the Sun and it is moving towards the Sun at the speed of 12 kilometers per second.

Distance (parsec) 130.72

Distance (light year) 426.14

Radial Speed -12 km/s

Proper Motion RA 0.004 arcsec/y

Proper Motion Dec -0.027"/y

Alternative Designations

Flamsteed designation 51 Ophiuchi

Henry Draper Catalogue HD158643

SAO Catalogue SAO185470

Hipparcos Catalogue HIP85755

Durchmusterung Catalogue CD-2313412

General Catalogue of Variable Stars 9037

Visibility from Your Location

Today's 51 Ophiuchi rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 114.0° RISE 15:05

Max altitude: 14.5° TRANSIT 18:48

Azimuth: 246.0° SET 22:31

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

Location

Other stars in Ophiuchus