HR20

HR20 is a double sub-giant star in the constellation of Cepheus.

HR20 visual magnitude is 6.01. Because of its reltive faintness, HR20 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 HR20:

Color of HR20 ⬤

Magnitude of HR20 6.01

Class Sub-giant

VISIBILITY RIGHT NOW HR20 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 43°.

Celestial coordinates and finder chart of HR20

HR20 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 HR20 are provided in the following table:

Right Ascension J2000 00h 09m 20s

Declination J2000 +79° 42’ 52”

Galactic Longitude 120.98°

Galactic Latitude 17°

Constellation Cepheus

The simplified sky map below shows the position of HR20 in the sky:

Simplified finder chart for HR20.

Visibility of HR20 from your location

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

HR20 is circumpolar and transits at 11:54 UTC (altitude: 61.8°)

Digitized Sky Survey image of HR20

The image below is a photograph of HR20 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 HR20 is 0.102 arcsec per year in Right Ascension and -0.027 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of HR20. The red arrow shows the motion of HR20 during the next 1000 years (1.70 arcmin in Right Ascension and -0.45 arcmin in declination);

Distance of HR20 from the Sun and relative movement

HR20 is distant 380.84 light years from the Sun and it is moving far from the Sun at the speed of 1 kilometers per second.

Distance (parsec) 116.82 pc

Distance (light year) 380.84 ly

Heliocentric radial velocity 1 km/s

Proper Motion RA 0.102 arcsec/year

Proper Motion Dec -0.027 arcsec/year

Spectral properties of HR20

HR20 belongs to spectral class A7 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude 0.67

Spectral Type A7IV

Color Index (B-V) 0.19

Temperature of HR20 8241K

The red dot in the diagram below shows where HR20 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR20. Attribution: Richard Powell / CC BY-SA

HR20 star system properties

HR20 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR20 double sysyem:

Main star magnitude 6.01

Secondary star magnitude 6.21

Magnitude difference 0.2

Separation 0.6 arcsec

Alternative designations of HR20

Henry Draper Catalogue HD431

SAO Catalogue SAO4048

Hipparcos Catalogue HIP760

Durchmusterung Catalogue BD+78 1

Aitken Double Star Catalogue ADS102

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In Evidence

Other stars in Cepheus