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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: 7:44  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
sleep NighttimeWhat's Visible Now?
All Constellations » Carina » 


Altitude: -54.4°   Azimuth: 155.0°   Direction: South-South-East

HR3721 is a hypergiant star in the constellation of Carina.

HR3721 visual magnitude is 5.86. Because of its reltive faintness, HR3721 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 HR3721:


HR3721 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -54.4°
Azimuth: 155.0°
Direction: South-South-East

Celestial coordinates and finder chart of HR3721

HR3721 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 HR3721 are provided in the following table:

09h 17m 27s
-74° 44’ 04”

The simplified sky map below shows the position of HR3721 in the sky:

Finder chart HR3721 star
Simplified finder chart for HR3721.

Visibility of HR3721 from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

HR3721 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR3721

The image below is a photograph of HR3721 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 HR3721 is -0.041 arcsec per year in Right Ascension and 0.033 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3721 star
DSS2 image of HR3721. The red arrow shows the motion of HR3721 during the next 10000 years (-6.83 arcmin in Right Ascension and 5.50 arcmin in declination);

Distance of HR3721 from the Sun and relative movement

HR3721 is distant 263.54 light years from the Sun

80.84 pc
263.54 ly
-0.041 arcsec/year
0.033 arcsec/year

Spectral properties of HR3721

HR3721 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 HR3721 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3721. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3721