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: 6:54  
clear_day Transit: 12:49  
SunsetSet: 18:43 south
sunny DaytimeWhat's Visible Now
All Constellations » Monoceros » 


Altitude: 29.1°   Azimuth: 208.0°   Direction: South-South-West

HR2639 is a variable giant star in the constellation of Monoceros.

HR2639 visual magnitude is 5.2. Because of its reltive faintness, HR2639 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 HR2639:


HR2639 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 29.1°
Azimuth: 208.0°
Direction: South-South-West

Celestial coordinates and finder chart of HR2639

HR2639 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 HR2639 are provided in the following table:

07h 01m 56s
-05° 43’ 19”

The simplified sky map below shows the position of HR2639 in the sky:

Finder chart HR2639 star
Simplified finder chart for HR2639.

Visibility of HR2639 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 HR2639 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: 95.7°
Max altitude: 32.8°
Azimuth: 264.3°

Digitized Sky Survey image of HR2639

The image below is a photograph of HR2639 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 HR2639 is -0.016 arcsec per year in Right Ascension and 0.001 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR2639 star
DSS2 image of HR2639. The red arrow shows the motion of HR2639 during the next 10000 years (-2.67 arcmin in Right Ascension and 0.17 arcmin in declination);

Distance of HR2639 from the Sun and relative movement

HR2639 is distant 682.01 light years from the Sun and it is moving far from the Sun at the speed of 3 kilometers per second.

209.21 pc
682.01 ly
3 km/s
-0.016 arcsec/year
0.001 arcsec/year

Spectral properties of HR2639

HR2639 belongs to spectral class M2 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR2639 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR2639. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR2639