Your Guide to the Solar System and the Night Sky
Donate now! You'll help cover server costs, enhance the site and keep it ad-free.
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:43  
clear_day Transit: 12:58  
SunsetSet: 21:12 south
sunny DaytimeWhat's Visible Now
All Constellations » Aquarius » 


Altitude: -28.2°   Azimuth: 304.2°   Direction: North-West

HR8840 is a main-sequence star in the constellation of Aquarius.

HR8840 visual magnitude is 5.55. Because of its reltive faintness, HR8840 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 HR8840:


HR8840 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -28.2°
Azimuth: 304.2°
Direction: North-West

Celestial coordinates and finder chart of HR8840

HR8840 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 HR8840 are provided in the following table:

23h 15m 34s
-03° 29’ 47”

The simplified sky map below shows the position of HR8840 in the sky:

Finder chart HR8840 star
Simplified finder chart for HR8840.

Visibility of HR8840 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 HR8840 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: 93.5°
Max altitude: 35.0°
Azimuth: 266.5°
HR8840 is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR8840

The image below is a photograph of HR8840 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 HR8840 is -0.007 arcsec per year in Right Ascension and -0.003 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR8840 star
DSS2 image of HR8840. The red arrow shows the motion of HR8840 during the next 100000 years (-11.67 arcmin in Right Ascension and -5.00 arcmin in declination);

Distance of HR8840 from the Sun and relative movement

HR8840 is distant 231.37 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.

70.97 pc
231.37 ly
11 km/s
-0.007 arcsec/year
-0.003 arcsec/year

Spectral properties of HR8840

HR8840 belongs to spectral class A3 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR8840 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR8840. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR8840