Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:46  
clear_day Transit: 12:56  
SunsetSet: 21:07 south
sunny DaytimeWhat's Visible Now
All Constellations » Carina » 


Altitude: -49.3°   Azimuth: 156.4°   Direction: South-South-East

HR3720 is a multiple main-sequence star in the constellation of Carina.

HR3720 visual magnitude is 5.29. Because of its reltive faintness, HR3720 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 HR3720:


HR3720 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -49.3°
Azimuth: 156.4°
Direction: South-South-East

Celestial coordinates and finder chart of HR3720

HR3720 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 HR3720 are provided in the following table:

09h 17m 25s
-74° 53’ 39”

The simplified sky map below shows the position of HR3720 in the sky:

Finder chart HR3720 star
Simplified finder chart for HR3720.

Visibility of HR3720 from your location

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

HR3720 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR3720

The image below is a photograph of HR3720 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 HR3720 is -0.015 arcsec per year in Right Ascension and 0.03 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3720 star
DSS2 image of HR3720. The red arrow shows the motion of HR3720 during the next 10000 years (-2.50 arcmin in Right Ascension and 5.00 arcmin in declination);

Distance of HR3720 from the Sun and relative movement

HR3720 is distant 721.24 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.

221.24 pc
721.24 ly
11 km/s
-0.015 arcsec/year
0.03 arcsec/year

Spectral properties of HR3720

HR3720 belongs to spectral class A1 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR3720 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3720. Attribution: Richard Powell / CC BY-SA

HR3720 star system properties

HR3720 is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the HR3720 double sysyem:

0.2 arcsec

Alternative designations of HR3720