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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: 7:49  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
wb_twilight Nautical TwilightWhat's Visible Now?
All Constellations » Hydra » 


Altitude: -33.4°   Azimuth: 16.8°   Direction: North-North-East

HR3651 is a hypergiant star in the constellation of Hydra.

HR3651 visual magnitude is 6.14. Because of its reltive faintness, HR3651 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 HR3651:


HR3651 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -33.4°
Azimuth: 16.8°
Direction: North-North-East

Celestial coordinates and finder chart of HR3651

HR3651 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 HR3651 are provided in the following table:

09h 12m 12s
+03° 52’ 01”

The simplified sky map below shows the position of HR3651 in the sky:

Finder chart HR3651 star
Simplified finder chart for HR3651.

Visibility of HR3651 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 HR3651 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: 86.1°
Max altitude: 42.4°
Azimuth: 273.9°

Digitized Sky Survey image of HR3651

The image below is a photograph of HR3651 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 HR3651 is -0.044 arcsec per year in Right Ascension and -0.001 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3651 star
DSS2 image of HR3651. The red arrow shows the motion of HR3651 during the next 10000 years (-7.33 arcmin in Right Ascension and -0.17 arcmin in declination);

Distance of HR3651 from the Sun and relative movement

HR3651 is distant 375.58 light years from the Sun and it is moving far from the Sun at the speed of 20 kilometers per second.

115.21 pc
375.58 ly
20 km/s
-0.044 arcsec/year
-0.001 arcsec/year

Spectral properties of HR3651

HR3651 belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.


The red dot in the diagram below shows where HR3651 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3651. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3651