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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:38  
clear_day Transit: 12:10  
SunsetSet: 17:43
sleep NighttimeWhat's Visible Now?
All Constellations » Equuleus » 

3 Equulei

Altitude: -32.9°   Azimuth: 354.3°   Direction: North

3 Equulei is a double giant star in the constellation of Equuleus.

3 Equulei visual magnitude is 5.61. Because of its reltive faintness, 3 Equulei 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 3 Equulei is 0.017 arcsec per year in Right Ascension and -0.002 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 3 Equulei star
DSS2 image of 3 Equulei. The red arrow shows the motion of 3 Equulei during the next 10000 years (2.83 arcmin in Right Ascension and -0.33 arcmin in declination);

Key facts about 3 Equulei

5.61
Giant

3 Equulei is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -32.9°
Azimuth: 354.3°
Direction: North

Celestial coordinates and finder chart of 3 Equulei

3 Equulei 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 3 Equulei are provided in the following table:

21h 04m 34s
+05° 30’ 10”
54.83°
-26.26°
Equuleus

The simplified sky map below shows the position of 3 Equulei in the sky:

Finder chart 3 Equulei star
Simplified finder chart for 3 Equulei.

Visibility of 3 Equulei from your location

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

Today's 3 Equulei rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 84.5°
Max altitude: 44.0°
Azimuth: 275.5°

Distance of 3 Equulei from the Sun and relative movement

3 Equulei is distant 687.76 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

210.97 pc
687.76 ly
-16 km/s
0.017 arcsec/year
-0.002 arcsec/year

Spectral properties of 3 Equulei

3 Equulei belongs to spectral class K5 and has a luminosity class of III corresponding to a giant star.

-1.01
K5III
3581K

The red dot in the diagram below shows where 3 Equulei is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of 3 Equulei. Attribution: Richard Powell / CC BY-SA

3 Equulei star system properties

3 Equulei 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 3 Equulei double sysyem:

5.61
12.51
6.9
81.7 arcsec

Alternative designations of 3 Equulei

SAO126518
SAO126518