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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: 7:51  
clear_day Transit: 11:50  
SunsetSet: 15:49 south
sunny DaytimeWhat's Visible Now?
All Constellations » Carina » 


Altitude: -70.2°   Azimuth: 248.3°   Direction: West-South-West

HR3157 is a variable and double sub-giant star in the constellation of Carina.

HR3157 visual magnitude is 6.1. Because of its reltive faintness, HR3157 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 HR3157:


HR3157 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -70.2°
Azimuth: 248.3°
Direction: West-South-West

Celestial coordinates and finder chart of HR3157

HR3157 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 HR3157 are provided in the following table:

08h 01m 22s
-54° 30’ 54”

The simplified sky map below shows the position of HR3157 in the sky:

Finder chart HR3157 star
Simplified finder chart for HR3157.

Visibility of HR3157 from your location

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

HR3157 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR3157

The image below is a photograph of HR3157 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 HR3157 is -0.018 arcsec per year in Right Ascension and 0.021 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3157 star
DSS2 image of HR3157. The red arrow shows the motion of HR3157 during the next 10000 years (-3.00 arcmin in Right Ascension and 3.50 arcmin in declination);

Distance of HR3157 from the Sun and relative movement

HR3157 is distant 1,319.84 light years from the Sun and it is moving far from the Sun at the speed of 34 kilometers per second.

404.86 pc
1,319.84 ly
34 km/s
-0.018 arcsec/year
0.021 arcsec/year

Spectral properties of HR3157

HR3157 belongs to spectral class B2 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where HR3157 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3157. Attribution: Richard Powell / CC BY-SA

HR3157 star system properties

HR3157 is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the HR3157 double sysyem:

40.2 arcsec

Alternative designations of HR3157