Atlas - 27 Tauri

Atlas, also designated as 27 Tauri , is a variable and multiple giant star in the constellation of Taurus.

Atlas visual magnitude is 3.63. Because of its moderate brightness, Atlas should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about Atlas:

Color of Atlas ⬤

Magnitude of Atlas 3.63

Class Giant

VISIBILITY RIGHT NOW Atlas - 27 Tauri is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of Atlas

Atlas is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Atlas are provided in the following table:

Right Ascension J2000 03h 49m 09s

Declination J2000 +24° 03’ 11”

Galactic Longitude 167.01°

Galactic Latitude -23.23°

Constellation Taurus

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

Simplified finder chart for Atlas - 27 Tauri.

Visibility of Atlas from your location

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

Today's Atlas - 27 Tauri rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 65.9° RISE 8:00

Max altitude: 62.6° TRANSIT 16:14

Azimuth: 294.1° SET 0:27

RIGHT NOW Atlas - 27 Tauri is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of Atlas

The image below is a photograph of Atlas 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 Atlas is 0.018 arcsec per year in Right Ascension and -0.047 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of Atlas. The red arrow shows the motion of Atlas during the next 10000 years (3.00 arcmin in Right Ascension and -7.83 arcmin in declination);

Distance of Atlas from the Sun and relative movement

Atlas is distant 380.40 light years from the Sun and it is moving far from the Sun at the speed of 9 kilometers per second.

Distance (parsec) 116.69 pc

Distance (light year) 380.40 ly

Heliocentric radial velocity 9 km/s

Proper Motion RA 0.018 arcsec/year

Proper Motion Dec -0.047 arcsec/year

Spectral properties of Atlas

Atlas belongs to spectral class B8 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -1.71

Spectral Type B8III

Color Index (B-V) -0.09

Temperature of Atlas 11407K

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

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

Atlas star system properties

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

Main star magnitude 3.63

Secondary star magnitude 5.13

Magnitude difference 1.5

Separation 0 arcsec

Alternative designations of Atlas

Proper Name Atlas

Flamsteed designation 27 Tauri

Henry Draper Catalogue HD23850

SAO Catalogue SAO76228

Hipparcos Catalogue HIP17847

Durchmusterung Catalogue BD+23 557

FK5 Catalogue 142

General Catalogue of Variable Stars 1345

Aitken Double Star Catalogue ADS2786

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