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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: 8.7°   Azimuth: 132.2°   Direction: South-East

HR3977 is a giant star in the constellation of Hydra.

HR3977 visual magnitude is 5.6. Because of its reltive faintness, HR3977 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 HR3977:


HR3977 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 8.7°
Azimuth: 132.2°
Direction: South-East

Celestial coordinates and finder chart of HR3977

HR3977 is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR3977 are provided in the following table:

10h 07m 09s
-17° 08’ 30”

The simplified sky map below shows the position of HR3977 in the sky:

Finder chart HR3977 star
Simplified finder chart for HR3977.

Visibility of HR3977 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 HR3977 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: 107.1°
Max altitude: 21.4°
Azimuth: 252.9°

Digitized Sky Survey image of HR3977

The image below is a photograph of HR3977 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 HR3977 is 0.016 arcsec per year in Right Ascension and -0.063 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3977 star
DSS2 image of HR3977. The red arrow shows the motion of HR3977 during the next 10000 years (2.67 arcmin in Right Ascension and -10.50 arcmin in declination);

Distance of HR3977 from the Sun and relative movement

HR3977 is distant 343.16 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.

105.26 pc
343.16 ly
11 km/s
0.016 arcsec/year
-0.063 arcsec/year

Spectral properties of HR3977

HR3977 belongs to spectral class K7 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR3977 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3977. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3977