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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: 7:47  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
sleep NighttimeWhat's Visible Now?
All Constellations » Cetus » 


Altitude: 8.6°   Azimuth: 241.8°   Direction: West-South-West

HR638 is a main-sequence star in the constellation of Cetus.

HR638 visual magnitude is 6.01. Because of its reltive faintness, HR638 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 HR638:


HR638 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 8.6°
Azimuth: 241.8°
Direction: West-South-West

Celestial coordinates and finder chart of HR638

HR638 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 HR638 are provided in the following table:

02h 11m 22s
-10° 03’ 07”

The simplified sky map below shows the position of HR638 in the sky:

Finder chart HR638 star
Simplified finder chart for HR638.

Visibility of HR638 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 HR638 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: 100.1°
Max altitude: 28.5°
Azimuth: 259.9°

Digitized Sky Survey image of HR638

The image below is a photograph of HR638 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 HR638 is -0.022 arcsec per year in Right Ascension and -0.166 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR638 star
DSS2 image of HR638. The red arrow shows the motion of HR638 during the next 1000 years (-0.37 arcmin in Right Ascension and -2.77 arcmin in declination);

Distance of HR638 from the Sun and relative movement

HR638 is distant 163.00 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.

50.00 pc
163.00 ly
11 km/s
-0.022 arcsec/year
-0.166 arcsec/year

Spectral properties of HR638

HR638 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 HR638 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR638. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR638