φ Ursae Majoris (phi Ursae Majoris)

φ Ursae Majoris is a double sub-giant star in the constellation of Ursa Major.

φ Ursae Majoris visual magnitude is 4.59. Because of its moderate brightness, φ Ursae Majoris 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 Ursae Majoris:

Color of φ Ursae Majoris ⬤

Magnitude of φ Ursae Majoris 4.59

Class Sub-giant

VISIBILITY RIGHT NOW φ Ursae Majoris (phi Ursae Majoris) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 74°.

Celestial coordinates and finder chart of φ Ursae Majoris

φ Ursae Majoris 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 Ursae Majoris are provided in the following table:

Right Ascension J2000 09h 52m 06s

Declination J2000 +54° 03’ 51”

Galactic Longitude 160.87°

Galactic Latitude 47.7°

Constellation Ursa Major

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

Finder chart φ Ursae Majoris (phi Ursae Majoris) star

Simplified finder chart for φ Ursae Majoris (phi Ursae Majoris).

Visibility of φ Ursae Majoris from your location

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

φ Ursae Majoris (phi Ursae Majoris) is circumpolar and transits at 21:43 UTC (altitude: 87.4°)

Digitized Sky Survey image of φ Ursae Majoris

The image below is a photograph of φ Ursae Majoris 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 Ursae Majoris is -0.004 arcsec per year in Right Ascension and 0.021 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of φ Ursae Majoris (phi Ursae Majoris) star

DSS2 image of φ Ursae Majoris. The red arrow shows the motion of φ Ursae Majoris during the next 10000 years (-0.67 arcmin in Right Ascension and 3.50 arcmin in declination);

Distance of φ Ursae Majoris from the Sun and relative movement

φ Ursae Majoris is distant 436.41 light years from the Sun and it is moving towards the Sun at the speed of 12 kilometers per second.

Distance (parsec) 133.87 pc

Distance (light year) 436.41 ly

Heliocentric radial velocity -12 km/s

Proper Motion RA -0.004 arcsec/year

Proper Motion Dec 0.021 arcsec/year

Spectral properties of φ Ursae Majoris

φ Ursae Majoris belongs to spectral class A3 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude -1.04

Spectral Type A3IV

Color Index (B-V) 0.03

Temperature of φ Ursae Majoris 9766K

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

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

φ Ursae Majoris star system properties

φ Ursae Majoris 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 φ Ursae Majoris double sysyem:

Main star magnitude 4.59

Secondary star magnitude 4.79

Magnitude difference 0.2

Separation 0.3 arcsec

Alternative designations of φ Ursae Majoris

Bayer designation φ Ursae Majoris
(phi Ursae Majoris)

Flamsteed designation 30 Ursae Majoris

Henry Draper Catalogue HD85235

SAO Catalogue SAO27408

Hipparcos Catalogue HIP48402

Durchmusterung Catalogue BD+54 1331

Aitken Double Star Catalogue ADS7545

How to support us

In Evidence

Other stars in Ursa Major