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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: 7:45  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
sleep NighttimeWhat's Visible Now?
All Constellations » Cetus » 


Altitude: 22.0°   Azimuth: 180.8°   Direction: South

HR172 is a multiple star in the constellation of Cetus.

HR172 visual magnitude is 6.49. Because of its reltive faintness, HR172 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 HR172:


HR172 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 22.0°
Azimuth: 180.8°
Direction: South

Celestial coordinates and finder chart of HR172

HR172 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 HR172 are provided in the following table:

00h 40m 28s
-16° 31’ 00”

The simplified sky map below shows the position of HR172 in the sky:

Finder chart HR172 star
Simplified finder chart for HR172.

Visibility of HR172 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 HR172 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: 106.5°
Max altitude: 22.0°
Azimuth: 253.5°

Digitized Sky Survey image of HR172

The image below is a photograph of HR172 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 HR172 is 0.037 arcsec per year in Right Ascension and -0.04 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR172 star
DSS2 image of HR172. The red arrow shows the motion of HR172 during the next 10000 years (6.17 arcmin in Right Ascension and -6.67 arcmin in declination);

Distance of HR172 from the Sun and relative movement

HR172 is distant 503.09 light years from the Sun and it is moving far from the Sun at the speed of 48 kilometers per second.

154.32 pc
503.09 ly
48 km/s
0.037 arcsec/year
-0.04 arcsec/year

Spectral properties of HR172

HR172 belongs to spectral class G5


The red dot in the diagram below shows where HR172 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR172. Attribution: Richard Powell / CC BY-SA

HR172 star system properties

HR172 is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the HR172 double sysyem:

105 arcsec

Alternative designations of HR172