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: 4:44  
clear_day Transit: 12:57  
SunsetSet: 21:11 south
sunny DaytimeWhat's Visible Now
All Constellations » Hydra » 


Altitude: -32.5°   Azimuth: 106.5°   Direction: East-South-East

HR4628 is a double hypergiant star in the constellation of Hydra.

HR4628 visual magnitude is 6.17. Because of its reltive faintness, HR4628 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 HR4628:


HR4628 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -32.5°
Azimuth: 106.5°
Direction: East-South-East

Celestial coordinates and finder chart of HR4628

HR4628 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 HR4628 are provided in the following table:

12h 10m 02s
-34° 42’ 17”

The simplified sky map below shows the position of HR4628 in the sky:

Finder chart HR4628 star
Simplified finder chart for HR4628.

Visibility of HR4628 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 HR4628 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: 124.7°
Max altitude: 3.8°
Azimuth: 235.3°
HR4628 is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR4628

The image below is a photograph of HR4628 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 HR4628 is -0.052 arcsec per year in Right Ascension and -0.018 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4628 star
DSS2 image of HR4628. The red arrow shows the motion of HR4628 during the next 10000 years (-8.67 arcmin in Right Ascension and -3.00 arcmin in declination);

Distance of HR4628 from the Sun and relative movement

HR4628 is distant 328.63 light years from the Sun and it is moving towards the Sun at the speed of 10 kilometers per second.

100.81 pc
328.63 ly
-10 km/s
-0.052 arcsec/year
-0.018 arcsec/year

Spectral properties of HR4628

HR4628 belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.


The red dot in the diagram below shows where HR4628 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4628. Attribution: Richard Powell / CC BY-SA

HR4628 star system properties

HR4628 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR4628 double sysyem:

3.4 arcsec

Alternative designations of HR4628