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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: 7:51  
clear_day Transit: 11:50  
SunsetSet: 15:49 south
sunny DaytimeWhat's Visible Now?
All Constellations » Hydra » 


Altitude: -3.8°   Azimuth: 229.5°   Direction: South-West

HR4803 is a double sub-giant star in the constellation of Hydra.

HR4803 visual magnitude is 5.45. Because of its reltive faintness, HR4803 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 HR4803:


HR4803 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -3.8°
Azimuth: 229.5°
Direction: South-West

Celestial coordinates and finder chart of HR4803

HR4803 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 HR4803 are provided in the following table:

12h 37m 42s
-27° 08’ 20”

The simplified sky map below shows the position of HR4803 in the sky:

Finder chart HR4803 star
Simplified finder chart for HR4803.

Visibility of HR4803 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 HR4803 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: 117.1°
Max altitude: 11.4°
Azimuth: 242.9°

Digitized Sky Survey image of HR4803

The image below is a photograph of HR4803 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 HR4803 is 0.076 arcsec per year in Right Ascension and -0.091 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR4803 star
DSS2 image of HR4803. The red arrow shows the motion of HR4803 during the next 1000 years (1.27 arcmin in Right Ascension and -1.52 arcmin in declination);

Distance of HR4803 from the Sun and relative movement

HR4803 is distant 112.76 light years from the Sun and it is moving towards the Sun at the speed of 1 kilometers per second.

34.59 pc
112.76 ly
-1 km/s
0.076 arcsec/year
-0.091 arcsec/year

Spectral properties of HR4803

HR4803 belongs to spectral class F1 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where HR4803 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4803. Attribution: Richard Powell / CC BY-SA

HR4803 star system properties

HR4803 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR4803 double sysyem:

1.4 arcsec

Alternative designations of HR4803