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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
sleep NighttimeWhat's Visible Now?
All Constellations » Hydra » 


Altitude: 3.8°   Azimuth: 143.7°   Direction: South-East

HR4157 is a variable and double main-sequence star in the constellation of Hydra.

HR4157 visual magnitude is 6.29. Because of its reltive faintness, HR4157 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 HR4157:


HR4157 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 3.8°
Azimuth: 143.7°
Direction: South-East

Celestial coordinates and finder chart of HR4157

HR4157 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 HR4157 are provided in the following table:

10h 36m 04s
-26° 40’ 30”

The simplified sky map below shows the position of HR4157 in the sky:

Finder chart HR4157 star
Simplified finder chart for HR4157.

Visibility of HR4157 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 HR4157 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: 116.7°
Max altitude: 11.8°
Azimuth: 243.3°

Digitized Sky Survey image of HR4157

The image below is a photograph of HR4157 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 HR4157 is 0.009 arcsec per year in Right Ascension and -0.062 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4157 star
DSS2 image of HR4157. The red arrow shows the motion of HR4157 during the next 10000 years (1.50 arcmin in Right Ascension and -10.33 arcmin in declination);

Distance of HR4157 from the Sun and relative movement

HR4157 is distant 143.49 light years from the Sun and it is moving towards the Sun at the speed of 23 kilometers per second.

44.01 pc
143.49 ly
-23 km/s
0.009 arcsec/year
-0.062 arcsec/year

Spectral properties of HR4157

HR4157 belongs to spectral class F5 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR4157 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4157. Attribution: Richard Powell / CC BY-SA

HR4157 star system properties

HR4157 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR4157 double sysyem:

1 arcsec

Alternative designations of HR4157