39 Ceti

39 Ceti is a variable and double giant star in the constellation of Cetus.

39 Ceti visual magnitude is 5.41. Because of its reltive faintness, 39 Ceti 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 39 Ceti:

Color of 39 Ceti ⬤

Magnitude of 39 Ceti 5.41

Class Giant

VISIBILITY RIGHT NOW 39 Ceti is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of 39 Ceti

39 Ceti 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 39 Ceti are provided in the following table:

Right Ascension J2000 01h 16m 36s

Declination J2000 -02° 30’ 01”

Galactic Longitude 137.75°

Galactic Latitude -64.64°

Constellation Cetus

The simplified sky map below shows the position of 39 Ceti in the sky:

Simplified finder chart for 39 Ceti.

Visibility of 39 Ceti from your location

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

Today's 39 Ceti rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 92.5° RISE 4:00

Max altitude: 36.0° TRANSIT 9:46

Azimuth: 267.5° SET 15:31

RIGHT NOW 39 Ceti is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 39 Ceti

The image below is a photograph of 39 Ceti 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 39 Ceti is -0.104 arcsec per year in Right Ascension and -0.063 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of 39 Ceti. The red arrow shows the motion of 39 Ceti during the next 1000 years (-1.73 arcmin in Right Ascension and -1.05 arcmin in declination);

Distance of 39 Ceti from the Sun and relative movement

39 Ceti is distant 255.89 light years from the Sun and it is moving towards the Sun at the speed of 20 kilometers per second.

Distance (parsec) 78.49 pc

Distance (light year) 255.89 ly

Heliocentric radial velocity -20 km/s

Proper Motion RA -0.104 arcsec/year

Proper Motion Dec -0.063 arcsec/year

Spectral properties of 39 Ceti

39 Ceti belongs to spectral class G5 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude 0.94

Spectral Type G5III

Color Index (B-V) 0.9

Temperature of 39 Ceti 4996K

The red dot in the diagram below shows where 39 Ceti is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 39 Ceti. Attribution: Richard Powell / CC BY-SA

39 Ceti star system properties

39 Ceti 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 39 Ceti double sysyem:

Main star magnitude 5.41

Secondary star magnitude 11.11

Magnitude difference 5.7

Separation 177.6 arcsec

Alternative designations of 39 Ceti

Flamsteed designation 39 Ceti

Henry Draper Catalogue HD7672

SAO Catalogue SAO129204

Hipparcos Catalogue HIP5951

Durchmusterung Catalogue BD-03 172

General Catalogue of Variable Stars AY Cet

In Evidence

Other stars in Cetus