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: 4:49  
clear_day Transit: 12:56  
SunsetSet: 21:04 south
sunny DaytimeWhat's Visible Now
All Constellations » Hydra » 


HR3805 is a hypergiant star in the constellation of Hydra.

HR3805 visual magnitude is 6.24. Because of its reltive faintness, HR3805 should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about HR3805:

HR3805 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 20°.

Celestial coordinates and finder chart of HR3805

HR3805 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 HR3805 are provided in the following table:

09h 33m 20s
-07° 11’ 24”

The simplified sky map below shows the position of HR3805 in the sky:

Finder chart HR3805 star
Simplified finder chart for HR3805.

Visibility of HR3805 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 HR3805 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: 97.2°
Max altitude: 31.3°
Azimuth: 262.8°
HR3805 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR3805

The image below is a photograph of HR3805 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 HR3805 is -0.033 arcsec per year in Right Ascension and -0.012 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3805 star
DSS2 image of HR3805. The red arrow shows the motion of HR3805 during the next 10000 years (-5.50 arcmin in Right Ascension and -2.00 arcmin in declination);

Distance of HR3805 from the Sun and relative movement

HR3805 is distant 420.65 light years from the Sun and it is moving far from the Sun at the speed of 29 kilometers per second.

129.03 pc
420.65 ly
29 km/s
-0.033 arcsec/year
-0.012 arcsec/year

Spectral properties of HR3805

HR3805 belongs to spectral class K0


The red dot in the diagram below shows where HR3805 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3805. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3805