Your guide to the Solar System and the night sky
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🌎  Observing from: Greenwich, United Kingdom [change]
🌅 Sunrise: 6:38  ☀️ Transit: 13:03  🌅 Sunset: 19:28

Zosma - δ Leonis (delta Leonis)

Zosma, also designated as δ Leonis (delta Leonis), is a variable and multiple main-sequence star in the constellation of Leo.

Zosma visual magnitude is 2.56, making it the 96th brightest star in the sky. Thanks to its high brightness, Zosma is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about Zosma:

Zosma - δ Leonis (delta Leonis) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 57°.

Celestial coordinates and finder chart of Zosma

Zosma is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Zosma are provided in the following table:

11h 14m 06s
+20° 31’ 24”

The simplified sky map below shows the position of Zosma in the sky:

Finder chart Zosma - δ Leonis (delta Leonis) star
Simplified finder chart for Zosma - δ Leonis (delta Leonis).

Visibility of Zosma from your location

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

Today's Zosma - δ Leonis (delta Leonis) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 69.5°
Max altitude: 59.0°
Azimuth: 290.5°
Zosma - δ Leonis (delta Leonis) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of Zosma

The image below is a photograph of Zosma 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 Zosma is 0.142 arcsec per year in Right Ascension and -0.13 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Zosma - δ Leonis (delta Leonis) star
DSS2 image of Zosma. The red arrow shows the motion of Zosma during the next 1000 years (2.37 arcmin in Right Ascension and -2.17 arcmin in declination);

Distance of Zosma from the Sun and relative movement

Zosma is distant 57.68 light years from the Sun and it is moving towards the Sun at the speed of 20 kilometers per second.

17.69 pc
57.68 ly
-20 km/s
0.142 arcsec/year
-0.13 arcsec/year

Spectral properties of Zosma

Zosma belongs to spectral class A4 and has a luminosity class of V corresponding to a main-sequence star.


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

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

Zosma star system properties

Zosma 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 Zosma double sysyem:

191.4 arcsec

Alternative designations of Zosma

δ Leonis
(delta Leonis)