Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:53  
clear_day Transit: 12:55  
SunsetSet: 20:58 south
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All Constellations » Lacerta » 

4 Lacertae

4 Lacertae is a supergiant star in the constellation of Lacerta.

4 Lacertae visual magnitude is 4.57. Because of its moderate brightness, 4 Lacertae should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about 4 Lacertae:

4 Lacertae is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 30°.

Celestial coordinates and finder chart of 4 Lacertae

4 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 4 Lacertae are provided in the following table:

22h 24m 30s
+49° 28’ 35”

The simplified sky map below shows the position of 4 Lacertae in the sky:

Finder chart 4 Lacertae star
Simplified finder chart for 4 Lacertae.

Visibility of 4 Lacertae from your location

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

4 Lacertae is circumpolar and transits at 06:06 UTC (altitude: 88.0°)

Digitized Sky Survey image of 4 Lacertae

The image below is a photograph of 4 Lacertae from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of 4 Lacertae is -0.007 arcsec per year in Right Ascension and -0.003 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of 4 Lacertae star
DSS2 image of 4 Lacertae. The red arrow shows the motion of 4 Lacertae during the next 100000 years (-11.67 arcmin in Right Ascension and -5.00 arcmin in declination);

Distance of 4 Lacertae from the Sun and relative movement

4 Lacertae is distant 2,116.88 light years from the Sun and it is moving towards the Sun at the speed of 26 kilometers per second.

649.35 pc
2,116.88 ly
-26 km/s
-0.007 arcsec/year
-0.003 arcsec/year

Spectral properties of 4 Lacertae

4 Lacertae belongs to spectral class B9 and has a luminosity class of I corresponding to a supergiant star.


The red dot in the diagram below shows where 4 Lacertae is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of 4 Lacertae. Attribution: Richard Powell / CC BY-SA

Alternative designations of 4 Lacertae