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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: 7:52  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
wb_twilight Civil TwilightWhat's Visible Now?
All Constellations » Leo » 


Altitude: 47.3°   Azimuth: 239.6°   Direction: West-South-West

HR4012 is a main-sequence star in the constellation of Leo.

HR4012 visual magnitude is 6.02. Because of its reltive faintness, HR4012 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 HR4012:


HR4012 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 47.3°
Azimuth: 239.6°
Direction: West-South-West

Celestial coordinates and finder chart of HR4012

HR4012 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 HR4012 are provided in the following table:

10h 14m 29s
+21° 10’ 04”

The simplified sky map below shows the position of HR4012 in the sky:

Finder chart HR4012 star
Simplified finder chart for HR4012.

Visibility of HR4012 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 HR4012 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: 68.8°
Max altitude: 59.7°
Azimuth: 291.2°

Digitized Sky Survey image of HR4012

The image below is a photograph of HR4012 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 HR4012 is -0.142 arcsec per year in Right Ascension and -0.082 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR4012 star
DSS2 image of HR4012. The red arrow shows the motion of HR4012 during the next 1000 years (-2.37 arcmin in Right Ascension and -1.37 arcmin in declination);

Distance of HR4012 from the Sun and relative movement

HR4012 is distant 169.17 light years from the Sun and it is moving far from the Sun at the speed of 17 kilometers per second.

51.89 pc
169.17 ly
17 km/s
-0.142 arcsec/year
-0.082 arcsec/year

Spectral properties of HR4012

HR4012 belongs to spectral class F9 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR4012 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4012. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4012