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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: 7:40  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
sleep NighttimeWhat's Visible Now?
All Constellations » Sculptor » 


Altitude: -12.6°   Azimuth: 230.7°   Direction: South-West

HR431 is a variable hypergiant star in the constellation of Sculptor.

HR431 visual magnitude is 6.58. Because of its reltive faintness, HR431 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 HR431:


HR431 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -12.6°
Azimuth: 230.7°
Direction: South-West

Celestial coordinates and finder chart of HR431

HR431 is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR431 are provided in the following table:

01h 28m 43s
-33° 45’ 48”

The simplified sky map below shows the position of HR431 in the sky:

Finder chart HR431 star
Simplified finder chart for HR431.

Visibility of HR431 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 HR431 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: 123.8°
Max altitude: 4.8°
Azimuth: 236.2°

Digitized Sky Survey image of HR431

The image below is a photograph of HR431 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 HR431 is -0.055 arcsec per year in Right Ascension and -0.025 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR431 star
DSS2 image of HR431. The red arrow shows the motion of HR431 during the next 10000 years (-9.17 arcmin in Right Ascension and -4.17 arcmin in declination);

Distance of HR431 from the Sun and relative movement

HR431 is distant 284.97 light years from the Sun and it is moving towards the Sun at the speed of 5 kilometers per second.

87.41 pc
284.97 ly
-5 km/s
-0.055 arcsec/year
-0.025 arcsec/year

Spectral properties of HR431

HR431 belongs to spectral class F0 and has a luminosity class of IV corresponding to a hypergiant star.


The red dot in the diagram below shows where HR431 is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of HR431. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR431