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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: 7:52  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sunny DaytimeWhat's Visible Now?
All Constellations » Hydra » 


Altitude: -1.8°   Azimuth: 226.9°   Direction: South-West

HR4881 is a hypergiant star in the constellation of Hydra.

HR4881 visual magnitude is 6.15. Because of its reltive faintness, HR4881 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 HR4881:


HR4881 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -1.8°
Azimuth: 226.9°
Direction: South-West

Celestial coordinates and finder chart of HR4881

HR4881 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 HR4881 are provided in the following table:

12h 51m 57s
-26° 44’ 17”

The simplified sky map below shows the position of HR4881 in the sky:

Finder chart HR4881 star
Simplified finder chart for HR4881.

Visibility of HR4881 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 HR4881 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: 116.7°
Max altitude: 11.8°
Azimuth: 243.3°

Digitized Sky Survey image of HR4881

The image below is a photograph of HR4881 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 HR4881 is -0.111 arcsec per year in Right Ascension and 0.04 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR4881 star
DSS2 image of HR4881. The red arrow shows the motion of HR4881 during the next 1000 years (-1.85 arcmin in Right Ascension and 0.67 arcmin in declination);

Distance of HR4881 from the Sun and relative movement

HR4881 is distant 196.15 light years from the Sun and it is moving towards the Sun at the speed of 18 kilometers per second.

60.17 pc
196.15 ly
-18 km/s
-0.111 arcsec/year
0.04 arcsec/year

Spectral properties of HR4881

HR4881 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 HR4881 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4881. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4881