1 Scorpii

Above the horizon. Rise: 19:18 | Tran: 22:47 | Set: 2:20

Alt: 11.31° Az: 164.74° Direction: South

1 Scorpii is a main-sequence star of spectral class B3 in the constellation of Scorpius.

1 Scorpii visual magnitude is 4.64. Because of its moderate brightness, 1 Scorpii 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 1 Scorpii. The red arrow shows the motion of 1 Scorpii during the next 10000 years (-3.00 arcmin in Right Ascension and -4.00 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 15h 52m 30s

Declination -25° 49’ 36”

Hour Angle 22h 53m 20s

Sidereal Time 14h 45m 51s

J2000

Right Ascension 15h 50m 58s

Declination -25° 45’ 05”

Galactic Coordinates

Galactic Longitude 346.1°

Galactic Latitude 21.71°

Finder Chart

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Finder chart for 1 Scorpii.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.64

Class Main-sequence

Absolute magnitude -1.38

Spectral Type B3V

Color Index (B-V) -0.05

Temperature 10795K

The red dot in the diagram below shows where 1 Scorpii is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 1 Scorpii. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

1 Scorpii is distant 521.60 light years from the Sun and it is moving far from the Sun at the speed of 3 kilometers per second.

Distance (parsec) 160.00

Distance (light year) 521.60

Radial Speed 3 km/s

Proper Motion RA -0.018 arcsec/y

Proper Motion Dec -0.024"/y

Alternative Designations

Flamsteed designation 1 Scorpii

Henry Draper Catalogue HD141637

SAO Catalogue SAO183854

Hipparcos Catalogue HIP77635

Durchmusterung Catalogue CD-2511131

Visibility from Your Location

Today's 1 Scorpii rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 115.8° RISE 19:18

Max altitude: 12.7° TRANSIT 22:47

Azimuth: 244.2° SET 2:20

Set Location

Other stars in Scorpius