φ Persei (phi Persei)

φ Persei is a variable main-sequence star in the constellation of Perseus.

φ Persei visual magnitude is 4.07. Because of its moderate brightness, φ Persei 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 φ Persei:

Color of φ Persei ⬤

Magnitude of φ Persei 4.07

Class Main-sequence

VISIBILITY RIGHT NOW φ Persei (phi Persei) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 35°.

Celestial coordinates and finder chart of φ Persei

φ Persei 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 φ Persei are provided in the following table:

Right Ascension J2000 01h 43m 39s

Declination J2000 +50° 41’ 18”

Galactic Longitude 131.32°

Galactic Latitude -11.33°

Constellation Perseus

The simplified sky map below shows the position of φ Persei in the sky:

Simplified finder chart for φ Persei (phi Persei).

Visibility of φ Persei from your location

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

φ Persei (phi Persei) is circumpolar and transits at 13:36 UTC (altitude: 89.2°)

Digitized Sky Survey image of φ Persei

The image below is a photograph of φ Persei 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 φ Persei is 0.026 arcsec per year in Right Ascension and -0.014 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of φ Persei. The red arrow shows the motion of φ Persei during the next 10000 years (4.33 arcmin in Right Ascension and -2.33 arcmin in declination);

Distance of φ Persei from the Sun and relative movement

φ Persei is distant 716.48 light years from the Sun and it is moving far from the Sun at the speed of 1 kilometers per second.

Distance (parsec) 219.78 pc

Distance (light year) 716.48 ly

Heliocentric radial velocity 1 km/s

Proper Motion RA 0.026 arcsec/year

Proper Motion Dec -0.014 arcsec/year

Spectral properties of φ Persei

φ Persei belongs to spectral class B2 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -2.64

Spectral Type B2V

Color Index (B-V) -0.04

Temperature of φ Persei 10653K

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

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

Alternative designations of φ Persei

Bayer designation φ Persei
(phi Persei)

Henry Draper Catalogue HD10516

SAO Catalogue SAO22554

Hipparcos Catalogue HIP8068

Durchmusterung Catalogue BD+49 444

FK5 Catalogue 57

General Catalogue of Variable Stars Phi Per

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In Evidence

Other stars in Perseus