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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
SunriseRise: 6:35  
clear_day Transit: 12:10  
SunsetSet: 17:45
sunny DaytimeWhat's Visible Now?
All Constellations » Andromeda » 

HR40

Altitude: 25.9°   Azimuth: 78.4°   Direction: East-North-East

HR40 is a multiple hypergiant star in the constellation of Andromeda.

HR40 visual magnitude is 6.3. Because of its reltive faintness, HR40 should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of HR40 is -0.008 arcsec per year in Right Ascension and -0.047 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR40 star
DSS2 image of HR40. The red arrow shows the motion of HR40 during the next 10000 years (-1.33 arcmin in Right Ascension and -7.83 arcmin in declination);

Key facts about HR40

6.3
Hypergiant

HR40 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 25.9°
Azimuth: 78.4°
Direction: East-North-East

Celestial coordinates and finder chart of HR40

HR40 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR40 are provided in the following table:

00h 13m 23s
+26° 59’ 13”
112.56°
-35.12°
Andromeda

The simplified sky map below shows the position of HR40 in the sky:

Finder chart HR40 star
Simplified finder chart for HR40.

Visibility of HR40 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 HR40 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: 63.0°
Max altitude: 65.5°
Azimuth: 297.0°

Distance of HR40 from the Sun and relative movement

HR40 is distant 403.47 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

123.76 pc
403.47 ly
-13 km/s
-0.008 arcsec/year
-0.047 arcsec/year

Spectral properties of HR40

HR40 belongs to spectral class G0 and has a luminosity class of III corresponding to a hypergiant star.

0.84
G0III
5778K

The red dot in the diagram below shows where HR40 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR40. Attribution: Richard Powell / CC BY-SA

HR40 star system properties

HR40 is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the HR40 double sysyem:

6.3
7.4
1.1
0.1 arcsec

Alternative designations of HR40

SAO73823
SAO73823