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: 4:45  
clear_day Transit: 12:57  
SunsetSet: 21:09 south
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All Constellations » Lacerta » 

15 Lacertae

Altitude: 81.7°   Azimuth: 170.3°   Direction: South

15 Lacertae is a multiple hypergiant star in the constellation of Lacerta.

15 Lacertae visual magnitude is 4.94. Because of its moderate brightness, 15 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 15 Lacertae:


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

Altitude: 81.7°
Azimuth: 170.3°
Direction: South

Celestial coordinates and finder chart of 15 Lacertae

15 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 15 Lacertae are provided in the following table:

22h 52m 01s
+43° 18’ 45”

The simplified sky map below shows the position of 15 Lacertae in the sky:

Finder chart 15 Lacertae star
Simplified finder chart for 15 Lacertae.

Visibility of 15 Lacertae from your location

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

15 Lacertae is circumpolar and transits at 05:54 UTC (altitude: 81.8°)

Digitized Sky Survey image of 15 Lacertae

The image below is a photograph of 15 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 15 Lacertae is 0.11 arcsec per year in Right Ascension and 0.029 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 15 Lacertae star
DSS2 image of 15 Lacertae. The red arrow shows the motion of 15 Lacertae during the next 1000 years (1.83 arcmin in Right Ascension and 0.48 arcmin in declination);

Distance of 15 Lacertae from the Sun and relative movement

15 Lacertae is distant 326.33 light years from the Sun and it is moving towards the Sun at the speed of 17 kilometers per second.

100.10 pc
326.33 ly
-17 km/s
0.11 arcsec/year
0.029 arcsec/year

Spectral properties of 15 Lacertae

15 Lacertae belongs to spectral class M0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where 15 Lacertae is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of 15 Lacertae. Attribution: Richard Powell / CC BY-SA

15 Lacertae star system properties

15 Lacertae is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the 15 Lacertae double sysyem:

104.4 arcsec

Alternative designations of 15 Lacertae

15 Lacertae