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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
SunriseRise: 6:35  
clear_day Transit: 12:10  
SunsetSet: 17:45
sleep NighttimeWhat's Visible Now?
All Constellations » Hydra » 


Altitude: 11.3°   Azimuth: 191.4°   Direction: South-South-West

HR4912 is a variable supergiant star in the constellation of Hydra.

HR4912 visual magnitude is 6.62. Because of its reltive faintness, HR4912 should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of HR4912 is 0.013 arcsec per year in Right Ascension and -0.015 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4912 star
DSS2 image of HR4912. The red arrow shows the motion of HR4912 during the next 10000 years (2.17 arcmin in Right Ascension and -2.50 arcmin in declination);

Key facts about HR4912


HR4912 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 11.3°
Azimuth: 191.4°
Direction: South-South-West

Celestial coordinates and finder chart of HR4912

HR4912 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 HR4912 are provided in the following table:

12h 56m 30s
-26° 27’ 37”

The simplified sky map below shows the position of HR4912 in the sky:

Finder chart HR4912 star
Simplified finder chart for HR4912.

Visibility of HR4912 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 HR4912 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: 116.5°
Max altitude: 12.1°
Azimuth: 243.5°

Distance of HR4912 from the Sun and relative movement

HR4912 is distant 32,600,000.00 light years from the Sun and it is moving towards the Sun at the speed of 24 kilometers per second.

10,000,000.00 pc
32,600,000.00 ly
-24 km/s
0.013 arcsec/year
-0.015 arcsec/year

Spectral properties of HR4912

HR4912 belongs to spectral class F3 and has a luminosity class of I corresponding to a supergiant star.


The red dot in the diagram below shows where HR4912 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4912. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4912