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: 6:55  
clear_day Transit: 12:49  
SunsetSet: 18:41 south
sunny DaytimeWhat's Visible Now
All Constellations » Hydra » 

55 Hydrae

Altitude: 9.9°   Azimuth: 157.7°   Direction: South-South-East

55 Hydrae is a hypergiant star in the constellation of Hydra.

55 Hydrae visual magnitude is 5.63. Because of its reltive faintness, 55 Hydrae 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 55 Hydrae:


55 Hydrae is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 9.9°
Azimuth: 157.7°
Direction: South-South-East

Celestial coordinates and finder chart of 55 Hydrae

55 Hydrae 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 55 Hydrae are provided in the following table:

14h 47m 22s
-25° 37’ 27”

The simplified sky map below shows the position of 55 Hydrae in the sky:

Finder chart 55 Hydrae star
Simplified finder chart for 55 Hydrae.

Visibility of 55 Hydrae 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 55 Hydrae 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: 115.6°
Max altitude: 12.9°
Azimuth: 244.4°

Digitized Sky Survey image of 55 Hydrae

The image below is a photograph of 55 Hydrae 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 55 Hydrae is -0.008 arcsec per year in Right Ascension and -0.016 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 55 Hydrae star
DSS2 image of 55 Hydrae. The red arrow shows the motion of 55 Hydrae during the next 10000 years (-1.33 arcmin in Right Ascension and -2.67 arcmin in declination);

Distance of 55 Hydrae from the Sun and relative movement

55 Hydrae is distant 612.78 light years from the Sun and it is moving towards the Sun at the speed of 18 kilometers per second.

187.97 pc
612.78 ly
-18 km/s
-0.008 arcsec/year
-0.016 arcsec/year

Spectral properties of 55 Hydrae

55 Hydrae belongs to spectral class A0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where 55 Hydrae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 55 Hydrae. Attribution: Richard Powell / CC BY-SA

Alternative designations of 55 Hydrae