1 Boötis

Below the horizon. Rise: 12:55 | Tran: 20:40 | Set: 4:29

Alt: -18.50° Az: 5.97° Direction: North

1 Boötis is a multiple main-sequence star of spectral class A1 in the constellation of Boötes.

1 Boötis visual magnitude is 5.75. Because of its faintness, 1 Boötis is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

DSS2 image of 1 Boötis. The red arrow shows the motion of 1 Boötis during the next 10000 years (-8.17 arcmin in Right Ascension and 3.83 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 13h 41m 53s

Declination +19° 49’ 38”

Hour Angle 12h 24m 04s

Sidereal Time 02h 05m 57s

J2000

Right Ascension 13h 40m 40s

Declination +19° 57’ 20”

Galactic Coordinates

Galactic Longitude 3.08°

Galactic Latitude 76.64°

Finder Chart

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Finder chart for 1 Boötis.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.75

Class Main-sequence

Absolute magnitude 0.91

Spectral Type A1V

Color Index (B-V) 0.01

Temperature 10002K

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

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

Star System Properties

1 Boötis is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the 1 Boötis double sysyem:

Main star magnitude 5.75

Secondary star magnitude 9.25

Magnitude difference 3.5

Separation 4.8 arcsec

Distance, Radial Speed, Proper Motion

1 Boötis is distant 302.69 light years from the Sun and it is moving towards the Sun at the speed of 26 kilometers per second.

Distance (parsec) 92.85

Distance (light year) 302.69

Radial Speed -26 km/s

Proper Motion RA -0.049 arcsec/y

Proper Motion Dec 0.023"/y

Alternative Designations

Flamsteed designation 1 Boötis

Henry Draper Catalogue HD119055

SAO Catalogue SAO82942

Hipparcos Catalogue HIP66727

Durchmusterung Catalogue BD+20 2858

Aitken Double Star Catalogue ADS8991

Visibility from Your Location

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

Azimuth: 70.2° RISE 12:55

Max altitude: 58.3° TRANSIT 20:40

Azimuth: 289.8° SET 4:29

Set Location

Other stars in Boötes