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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: 7:47  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
sleep NighttimeWhat's Visible Now?
All Constellations » Hydra » 


Altitude: -28.7°   Azimuth: 95.8°   Direction: East

HR5166 is a hypergiant star in the constellation of Hydra.

HR5166 visual magnitude is 6.21. Because of its reltive faintness, HR5166 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 HR5166:


HR5166 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -28.7°
Azimuth: 95.8°
Direction: East

Celestial coordinates and finder chart of HR5166

HR5166 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 HR5166 are provided in the following table:

13h 44m 45s
-25° 30’ 02”

The simplified sky map below shows the position of HR5166 in the sky:

Finder chart HR5166 star
Simplified finder chart for HR5166.

Visibility of HR5166 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 HR5166 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: 115.5°
Max altitude: 13.0°
Azimuth: 244.5°

Digitized Sky Survey image of HR5166

The image below is a photograph of HR5166 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 HR5166 is -0.053 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 HR5166 star
DSS2 image of HR5166. The red arrow shows the motion of HR5166 during the next 10000 years (-8.83 arcmin in Right Ascension and -2.67 arcmin in declination);

Distance of HR5166 from the Sun and relative movement

HR5166 is distant 705.63 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.

216.45 pc
705.63 ly
6 km/s
-0.053 arcsec/year
-0.016 arcsec/year

Spectral properties of HR5166

HR5166 belongs to spectral class K0


The red dot in the diagram below shows where HR5166 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR5166. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR5166