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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: 6:46  
clear_day Transit: 12:11  
SunsetSet: 17:36
sleep NighttimeWhat's Visible Now?
All Constellations » Hydra » 


Altitude: 0.8°   Azimuth: 233.5°   Direction: South-West

HR3808 is a hypergiant star in the constellation of Hydra.

HR3808 visual magnitude is 5.01. Because of its reltive faintness, HR3808 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 HR3808 is -0.02 arcsec per year in Right Ascension and 0.015 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3808 star
DSS2 image of HR3808. The red arrow shows the motion of HR3808 during the next 10000 years (-3.33 arcmin in Right Ascension and 2.50 arcmin in declination);

Key facts about HR3808


HR3808 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 0.8°
Azimuth: 233.5°
Direction: South-West

Celestial coordinates and finder chart of HR3808

HR3808 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 HR3808 are provided in the following table:

09h 33m 12s
-21° 06’ 56”

The simplified sky map below shows the position of HR3808 in the sky:

Finder chart HR3808 star
Simplified finder chart for HR3808.

Visibility of HR3808 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 HR3808 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: 111.1°
Max altitude: 17.4°
Azimuth: 248.9°

Distance of HR3808 from the Sun and relative movement

HR3808 is distant 334.02 light years from the Sun and it is moving far from the Sun at the speed of 13 kilometers per second.

102.46 pc
334.02 ly
13 km/s
-0.02 arcsec/year
0.015 arcsec/year

Spectral properties of HR3808

HR3808 belongs to spectral class K0 and has a luminosity class of IV corresponding to a hypergiant star.


The red dot in the diagram below shows where HR3808 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3808. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3808

Gl 355.2