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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: 6:48  
clear_day Transit: 12:11  
SunsetSet: 17:34
sunny DaytimeWhat's Visible Now?
All Constellations » Serpens » 

16 Serpentis

Altitude: -4.4°   Azimuth: 292.2°   Direction: West-North-West

16 Serpentis is a hypergiant star in the constellation of Serpens.

16 Serpentis visual magnitude is 5.26. Because of its reltive faintness, 16 Serpentis 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 16 Serpentis is 0.045 arcsec per year in Right Ascension and -0.129 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 16 Serpentis star
DSS2 image of 16 Serpentis. The red arrow shows the motion of 16 Serpentis during the next 1000 years (0.75 arcmin in Right Ascension and -2.15 arcmin in declination);

Key facts about 16 Serpentis


16 Serpentis is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -4.4°
Azimuth: 292.2°
Direction: West-North-West

Celestial coordinates and finder chart of 16 Serpentis

16 Serpentis 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 16 Serpentis are provided in the following table:

15h 36m 29s
+10° 00’ 35”

The simplified sky map below shows the position of 16 Serpentis in the sky:

Finder chart 16 Serpentis star
Simplified finder chart for 16 Serpentis.

Visibility of 16 Serpentis 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 16 Serpentis 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: 80.0°
Max altitude: 48.5°
Azimuth: 280.0°

Distance of 16 Serpentis from the Sun and relative movement

16 Serpentis is distant 234.70 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.

71.99 pc
234.70 ly
8 km/s
0.045 arcsec/year
-0.129 arcsec/year

Spectral properties of 16 Serpentis

16 Serpentis belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where 16 Serpentis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 16 Serpentis. Attribution: Richard Powell / CC BY-SA

Alternative designations of 16 Serpentis

16 Serpentis