3 Geminorum

Above the horizon. Rise: 7:02 | Tran: 15:09 | Set: 23:16

Alt: 11.81° Az: 67.60° Direction: East-North-East

3 Geminorum is a variable and multiple supergiant star of spectral class B2 in the constellation of Gemini.

3 Geminorum visual magnitude is 5.75. Because of its faintness, 3 Geminorum is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

DSS2 image of 3 Geminorum. The red arrow shows the motion of 3 Geminorum during the next 100000 years (11.67 arcmin in Right Ascension and -1.67 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 06h 11m 16s

Declination +23° 06’ 24”

Hour Angle 17h 18m 48s

Sidereal Time 23h 30m 05s

J2000

Right Ascension 06h 09m 43s

Declination +23° 06’ 47”

Galactic Coordinates

Galactic Longitude 187.75°

Galactic Latitude 1.77°

Finder Chart

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Finder chart for 3 Geminorum.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.75

Class Supergiant

Absolute magnitude -24.25

Spectral Type B2I

Color Index (B-V) 0.21

Temperature 8086K

The red dot in the diagram below shows where 3 Geminorum is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 3 Geminorum. Attribution: Richard Powell / CC BY-SA

Star System Properties

3 Geminorum is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the 3 Geminorum double sysyem:

Main star magnitude 5.75

Secondary star magnitude 8.25

Magnitude difference 2.5

Separation 0.7 arcsec

Distance, Radial Speed, Proper Motion

3 Geminorum is distant 32,600,000.00 light years from the Sun and it is moving far from the Sun at the speed of 16 kilometers per second.

Distance (parsec) 10,000,000.00

Distance (light year) 32,600,000.00

Radial Speed 16 km/s

Proper Motion RA 0.007 arcsec/y

Proper Motion Dec -0.001"/y

Alternative Designations

Flamsteed designation 3 Geminorum

Henry Draper Catalogue HD42087

SAO Catalogue SAO78050

Hipparcos Catalogue HIP29225

Durchmusterung Catalogue BD+23 1226

General Catalogue of Variable Stars 2846

Aitken Double Star Catalogue ADS4751

Visibility from Your Location

Today's 3 Geminorum rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 66.9° RISE 7:02

Max altitude: 61.6° TRANSIT 15:09

Azimuth: 293.1° SET 23:16

Set Location

Other stars in Gemini