HR2123

HR2123 is a variable and multiple giant star in the constellation of Auriga.

HR2123 visual magnitude is 6.45. Because of its reltive faintness, HR2123 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 HR2123:

Color of HR2123 ⬤

Magnitude of HR2123 6.45

Class Giant

VISIBILITY RIGHT NOW HR2123 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 48°.

Celestial coordinates and finder chart of HR2123

HR2123 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 HR2123 are provided in the following table:

Right Ascension J2000 06h 04m 29s

Declination J2000 +51° 34’ 23”

Galactic Longitude 161.8°

Galactic Latitude 14.17°

Constellation Auriga

The simplified sky map below shows the position of HR2123 in the sky:

Simplified finder chart for HR2123.

Visibility of HR2123 from your location

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

HR2123 is circumpolar and transits at 17:40 UTC (altitude: 89.9°)

Digitized Sky Survey image of HR2123

The image below is a photograph of HR2123 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 HR2123 is 0.005 arcsec per year in Right Ascension and -0.042 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR2123. The red arrow shows the motion of HR2123 during the next 10000 years (0.83 arcmin in Right Ascension and -7.00 arcmin in declination);

Distance of HR2123 from the Sun and relative movement

HR2123 is distant 393.72 light years from the Sun and it is moving far from the Sun at the speed of 20 kilometers per second.

Distance (parsec) 120.77 pc

Distance (light year) 393.72 ly

Heliocentric radial velocity 20 km/s

Proper Motion RA 0.005 arcsec/year

Proper Motion Dec -0.042 arcsec/year

Spectral properties of HR2123

HR2123 belongs to spectral class A7 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude 1.04

Spectral Type A7III

Color Index (B-V) 0.18

Temperature of HR2123 8321K

The red dot in the diagram below shows where HR2123 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR2123. Attribution: Richard Powell / CC BY-SA

HR2123 star system properties

HR2123 is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the HR2123 double sysyem:

Main star magnitude 6.45

Secondary star magnitude 9.25

Magnitude difference 2.8

Separation 39 arcsec

Alternative designations of HR2123

Henry Draper Catalogue HD40873

SAO Catalogue SAO25548

Hipparcos Catalogue HIP28765

Durchmusterung Catalogue BD+51 1146

FK5 Catalogue 2463

General Catalogue of Variable Stars 2804

Aitken Double Star Catalogue ADS4633

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In Evidence

Other stars in Auriga