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: 6:59  
clear_day Transit: 12:48  
SunsetSet: 18:36 south
sunny DaytimeWhat's Visible Now
All Constellations » Microscopium » 


Altitude: -33.8°   Azimuth: 99.8°   Direction: East

HR7909 is a hypergiant star in the constellation of Microscopium.

HR7909 visual magnitude is 5.76. Because of its reltive faintness, HR7909 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 HR7909:


HR7909 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -33.8°
Azimuth: 99.8°
Direction: East

Celestial coordinates and finder chart of HR7909

HR7909 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 HR7909 are provided in the following table:

20h 41m 23s
-31° 35’ 53”

The simplified sky map below shows the position of HR7909 in the sky:

Finder chart HR7909 star
Simplified finder chart for HR7909.

Visibility of HR7909 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 HR7909 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: 121.6°
Max altitude: 6.9°
Azimuth: 238.4°

Digitized Sky Survey image of HR7909

The image below is a photograph of HR7909 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 HR7909 is 0.113 arcsec per year in Right Ascension and -0.065 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR7909 star
DSS2 image of HR7909. The red arrow shows the motion of HR7909 during the next 1000 years (1.88 arcmin in Right Ascension and -1.08 arcmin in declination);

Distance of HR7909 from the Sun and relative movement

HR7909 is distant 419.02 light years from the Sun and it is moving towards the Sun at the speed of 97 kilometers per second.

128.53 pc
419.02 ly
-97 km/s
0.113 arcsec/year
-0.065 arcsec/year

Spectral properties of HR7909

HR7909 belongs to spectral class M0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where HR7909 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR7909. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7909