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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
north SunriseRise: 7:54  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sleep NighttimeWhat's Visible Now?
All Constellations » Hydra » 


Altitude: -66.8°   Azimuth: 358.8°   Direction: North

HR4839 is a giant star in the constellation of Hydra.

HR4839 visual magnitude is 5.48. Because of its reltive faintness, HR4839 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 HR4839:


HR4839 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -66.8°
Azimuth: 358.8°
Direction: North

Celestial coordinates and finder chart of HR4839

HR4839 is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4839 are provided in the following table:

12h 44m 00s
-28° 19’ 26”

The simplified sky map below shows the position of HR4839 in the sky:

Finder chart HR4839 star
Simplified finder chart for HR4839.

Visibility of HR4839 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 HR4839 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: 118.3°
Max altitude: 10.2°
Azimuth: 241.7°

Digitized Sky Survey image of HR4839

The image below is a photograph of HR4839 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 HR4839 is -0.027 arcsec per year in Right Ascension and -0.038 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4839 star
DSS2 image of HR4839. The red arrow shows the motion of HR4839 during the next 10000 years (-4.50 arcmin in Right Ascension and -6.33 arcmin in declination);

Distance of HR4839 from the Sun and relative movement

HR4839 is distant 396.59 light years from the Sun and it is moving far from the Sun at the speed of 7 kilometers per second.

121.65 pc
396.59 ly
7 km/s
-0.027 arcsec/year
-0.038 arcsec/year

Spectral properties of HR4839

HR4839 belongs to spectral class K4 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR4839 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4839. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4839