We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Your support keeps us free & ad-free » Donate
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:40  
clear_day Transit: 12:10  
SunsetSet: 17:41
wb_twilight Astronomical TwilightWhat's Visible Now?
All Constellations » Lacerta » 

12 Lacertae

Altitude: 22.5°   Azimuth: 53.0°   Direction: North-East

12 Lacertae is a variable and double giant star in the constellation of Lacerta.

12 Lacertae visual magnitude is 5.25. Because of its reltive faintness, 12 Lacertae should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of 12 Lacertae is -0.005 arcsec per year in Right Ascension and -0.001 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of 12 Lacertae star
DSS2 image of 12 Lacertae. The red arrow shows the motion of 12 Lacertae during the next 100000 years (-8.33 arcmin in Right Ascension and -1.67 arcmin in declination);

Key facts about 12 Lacertae


12 Lacertae is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 22.5°
Azimuth: 53.0°
Direction: North-East

Celestial coordinates and finder chart of 12 Lacertae

12 Lacertae is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 12 Lacertae are provided in the following table:

22h 41m 28s
+40° 13’ 32”

The simplified sky map below shows the position of 12 Lacertae in the sky:

Finder chart 12 Lacertae star
Simplified finder chart for 12 Lacertae.

Visibility of 12 Lacertae from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

12 Lacertae is circumpolar and transits at 11:54 UTC (altitude: 78.7°)

Distance of 12 Lacertae from the Sun and relative movement

12 Lacertae is distant 1,393.16 light years from the Sun and it is moving towards the Sun at the speed of 15 kilometers per second.

427.35 pc
1,393.16 ly
-15 km/s
-0.005 arcsec/year
-0.001 arcsec/year

Spectral properties of 12 Lacertae

12 Lacertae belongs to spectral class B2 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 12 Lacertae is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of 12 Lacertae. Attribution: Richard Powell / CC BY-SA

12 Lacertae star system properties

12 Lacertae 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 12 Lacertae double sysyem:

69 arcsec

Alternative designations of 12 Lacertae

12 Lacertae