Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]

HR240

HR240 is a main-sequence star in the constellation of Cepheus.

HR240 visual magnitude is 5.62. Because of its reltive faintness, HR240 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 HR240:

5.62
Main-sequence
HR240 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 57°.

Celestial coordinates and finder chart of HR240

HR240 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR240 are provided in the following table:

00h 54m 53s
+83° 42’ 25”
123.03°
20.84°
Cepheus

The simplified sky map below shows the position of HR240 in the sky:

Finder chart HR240 star
Simplified finder chart for HR240.

Visibility of HR240 from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

HR240 is circumpolar and transits at 20:10 UTC (altitude: 57.8°)

Digitized Sky Survey image of HR240

The image below is a photograph of HR240 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 HR240 is 0.062 arcsec per year in Right Ascension and -0.022 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR240 star
DSS2 image of HR240. The red arrow shows the motion of HR240 during the next 10000 years (10.33 arcmin in Right Ascension and -3.67 arcmin in declination);

Distance of HR240 from the Sun and relative movement

HR240 is distant 245.11 light years from the Sun and it is moving far from the Sun at the speed of 12 kilometers per second.

75.19 pc
245.11 ly
12 km/s
0.062 arcsec/year
-0.022 arcsec/year

Spectral properties of HR240

HR240 belongs to spectral class A4 and has a luminosity class of V corresponding to a main-sequence star.

1.24
A4V
9125K

The red dot in the diagram below shows where HR240 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR240. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR240

SAO143
SAO143