Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:43  
clear_day Transit: 12:58  
SunsetSet: 21:13 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Camelopardalis » 

HR4639

Altitude: 49.5°   Azimuth: 347.4°   Direction: North-North-West

HR4639 is a double giant star in the constellation of Camelopardalis.

HR4639 visual magnitude is 6. Because of its reltive faintness, HR4639 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 HR4639:

6
Giant

HR4639 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 49.5°
Azimuth: 347.4°
Direction: North-North-West

Celestial coordinates and finder chart of HR4639

HR4639 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4639 are provided in the following table:

12h 10m 59s
+81° 42’ 35”
124.71°
35.28°
Camelopardalis

The simplified sky map below shows the position of HR4639 in the sky:

Finder chart HR4639 star
Simplified finder chart for HR4639.

Visibility of HR4639 from your location

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

HR4639 is circumpolar and transits at 18:51 UTC (altitude: 59.8°)

Digitized Sky Survey image of HR4639

The image below is a photograph of HR4639 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 HR4639 is -0.029 arcsec per year in Right Ascension and 0.007 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4639 star
DSS2 image of HR4639. The red arrow shows the motion of HR4639 during the next 10000 years (-4.83 arcmin in Right Ascension and 1.17 arcmin in declination);

Distance of HR4639 from the Sun and relative movement

HR4639 is distant 1,101.35 light years from the Sun and it is moving towards the Sun at the speed of 27 kilometers per second.

337.84 pc
1,101.35 ly
-27 km/s
-0.029 arcsec/year
0.007 arcsec/year

Spectral properties of HR4639

HR4639 belongs to spectral class K5

-1.64
K5
3622K

The red dot in the diagram below shows where HR4639 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR4639. Attribution: Richard Powell / CC BY-SA

HR4639 star system properties

HR4639 is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the HR4639 double sysyem:

6
8
2
66.7 arcsec

Alternative designations of HR4639

SAO1991
SAO1991