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: 6:44  
clear_day Transit: 12:51  
SunsetSet: 18:57 south
sleep NighttimeWhat's Visible Now
All Constellations » Lacerta » 


Altitude: 80.2°   Azimuth: 246.3°   Direction: West-South-West

HR8421 is a variable giant star in the constellation of Lacerta.

HR8421 visual magnitude is 6.13. Because of its reltive faintness, HR8421 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 HR8421:


HR8421 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 80.2°
Azimuth: 246.3°
Direction: West-South-West

Celestial coordinates and finder chart of HR8421

HR8421 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR8421 are provided in the following table:

22h 05m 16s
+46° 44’ 40”

The simplified sky map below shows the position of HR8421 in the sky:

Finder chart HR8421 star
Simplified finder chart for HR8421.

Visibility of HR8421 from your location

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

HR8421 is circumpolar and transits at 21:59 UTC (altitude: 85.3°)

Digitized Sky Survey image of HR8421

The image below is a photograph of HR8421 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 HR8421 is -0.042 arcsec per year in Right Ascension and -0.02 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR8421 star
DSS2 image of HR8421. The red arrow shows the motion of HR8421 during the next 10000 years (-7.00 arcmin in Right Ascension and -3.33 arcmin in declination);

Distance of HR8421 from the Sun and relative movement

HR8421 is distant 961.65 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

294.99 pc
961.65 ly
-13 km/s
-0.042 arcsec/year
-0.02 arcsec/year

Spectral properties of HR8421

HR8421 belongs to spectral class M4 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR8421 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR8421. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR8421