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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: 7:49  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
sunny DaytimeWhat's Visible Now?
All Constellations » Hydra » 


Altitude: -11.5°   Azimuth: 248.2°   Direction: West-South-West

HR4073 is a double hypergiant star in the constellation of Hydra.

HR4073 visual magnitude is 6.51. Because of its reltive faintness, HR4073 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 HR4073:


HR4073 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -11.5°
Azimuth: 248.2°
Direction: West-South-West

Celestial coordinates and finder chart of HR4073

HR4073 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 HR4073 are provided in the following table:

10h 21m 35s
-22° 31’ 41”

The simplified sky map below shows the position of HR4073 in the sky:

Finder chart HR4073 star
Simplified finder chart for HR4073.

Visibility of HR4073 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 HR4073 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: 112.5°
Max altitude: 16.0°
Azimuth: 247.5°

Digitized Sky Survey image of HR4073

The image below is a photograph of HR4073 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 HR4073 is -0.03 arcsec per year in Right Ascension and 0.006 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4073 star
DSS2 image of HR4073. The red arrow shows the motion of HR4073 during the next 10000 years (-5.00 arcmin in Right Ascension and 1.00 arcmin in declination);

Distance of HR4073 from the Sun and relative movement

HR4073 is distant 425.59 light years from the Sun and it is moving far from the Sun at the speed of 12 kilometers per second.

130.55 pc
425.59 ly
12 km/s
-0.03 arcsec/year
0.006 arcsec/year

Spectral properties of HR4073

HR4073 belongs to spectral class A0


The red dot in the diagram below shows where HR4073 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4073. Attribution: Richard Powell / CC BY-SA

HR4073 star system properties

HR4073 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR4073 double sysyem:

1.8 arcsec

Alternative designations of HR4073