α Geminorum (alpha Geminorum)

Below the horizon. Rise: 7:08 | Tran: 16:30 | Set: 1:56

Alt: -1.37° Az: 28.70° Direction: North-North-East

α Geminorum is a multiple main-sequence star of spectral class A2 in the constellation of Gemini.

α Geminorum visual magnitude is 2.88. Because of its brightness, α Geminorum is clearly visible to the naked eye when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

Image of α Geminorum (alpha Geminorum) star

DSS2 image of α Geminorum. The red arrow shows the motion of α Geminorum during the next 1000 years (-2.87 arcmin in Right Ascension and -1.65 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 07h 36m 13s

Declination +31° 49’ 53”

Hour Angle 14h 17m 38s

Sidereal Time 21h 53m 52s

J2000

Right Ascension 07h 34m 36s

Declination +31° 53’ 18”

Galactic Coordinates

Galactic Longitude 187.44°

Galactic Latitude 22.48°

Finder Chart

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Finder chart for α Geminorum (alpha Geminorum).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 2.88

Class Main-sequence

Absolute magnitude 1.89

Spectral Type A2V

Color Index (B-V) 0.04

Temperature 9652K

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

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

Star System Properties

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

Main star magnitude 2.88

Secondary star magnitude 3.78

Magnitude difference 0.9

Separation 2 arcsec

Distance, Radial Speed, Proper Motion

α Geminorum is distant 51.53 light years from the Sun and it is moving towards the Sun at the speed of 1 kilometers per second.

Distance (parsec) 15.81

Distance (light year) 51.53

Radial Speed -1 km/s

Proper Motion RA -0.172 arcsec/y

Proper Motion Dec -0.099"/y

Alternative Designations

Bayer designation α Geminorum
(alpha Geminorum)

Flamsteed designation 66 Geminorum

Henry Draper Catalogue HD60178

SAO Catalogue SAO60198

Durchmusterung Catalogue BD+32 1581

Gliese Catalogue Gl 278 B

FK5 Catalogue 287

Aitken Double Star Catalogue ADS6175

Visibility from Your Location

Today's α Geminorum (alpha Geminorum) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 58.2° RISE 7:08

Max altitude: 70.4° TRANSIT 16:30

Azimuth: 301.8° SET 1:56

Set Location

Other stars in Gemini