HR90

HR90 is a variable and double giant star in the constellation of Andromeda.

HR90 visual magnitude is 7.39. Because of its reltive faintness, HR90 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 HR90:

Color of HR90 ⬤

Magnitude of HR90 7.39

Class Giant

VISIBILITY RIGHT NOW HR90 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 4°.

Celestial coordinates and finder chart of HR90

HR90 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR90 are provided in the following table:

Right Ascension J2000 00h 24m 02s

Declination J2000 +38° 34’ 37”

Galactic Longitude 117.07°

Galactic Latitude -23.98°

Constellation Andromeda

The simplified sky map below shows the position of HR90 in the sky:

Simplified finder chart for HR90.

Visibility of HR90 from your location

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

HR90 is circumpolar and transits at 11:53 UTC (altitude: 77.1°)

Digitized Sky Survey image of HR90

The image below is a photograph of HR90 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 HR90 is -0.007 arcsec per year in Right Ascension and -0.023 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR90. The red arrow shows the motion of HR90 during the next 10000 years (-1.17 arcmin in Right Ascension and -3.83 arcmin in declination);

Spectral properties of HR90

HR90 belongs to spectral class S6 and has a luminosity class of III corresponding to a giant star.

Spectral Type S6III

Color Index (B-V) 1.97

Temperature of HR90 3201K

HR90 star system properties

HR90 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR90 double sysyem:

Main star magnitude 7.39

Secondary star magnitude 12.29

Magnitude difference 4.9

Separation 84.6 arcsec

Alternative designations of HR90

Henry Draper Catalogue HD1967

SAO Catalogue SAO53860

Durchmusterung Catalogue BD+37 58

General Catalogue of Variable Stars R And

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