Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:44  
clear_day Transit: 12:57  
SunsetSet: 21:11 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Orion » 

φ1 Orionis (phi1 Orionis)

Altitude: -27.7°   Azimuth: 16.3°   Direction: North-North-East

φ1 Orionis is a hypergiant star in the constellation of Orion.

φ1 Orionis visual magnitude is 4.41. Because of its moderate brightness, φ1 Orionis 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 φ1 Orionis:


φ1 Orionis (phi1 Orionis) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -27.7°
Azimuth: 16.3°
Direction: North-North-East

Celestial coordinates and finder chart of φ1 Orionis

φ1 Orionis 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 φ1 Orionis are provided in the following table:

05h 34m 49s
+09° 29’ 21”

The simplified sky map below shows the position of φ1 Orionis in the sky:

Finder chart φ1 Orionis (phi1 Orionis) star
Simplified finder chart for φ1 Orionis (phi1 Orionis).

Visibility of φ1 Orionis 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 φ1 Orionis (phi1 Orionis) 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: 80.5°
Max altitude: 48.0°
Azimuth: 279.5°
φ1 Orionis (phi1 Orionis) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of φ1 Orionis

The image below is a photograph of φ1 Orionis 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 φ1 Orionis is 0.002 arcsec per year in Right Ascension and -0.004 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of φ1 Orionis (phi1 Orionis) star
DSS2 image of φ1 Orionis. The red arrow shows the motion of φ1 Orionis during the next 100000 years (3.33 arcmin in Right Ascension and -6.67 arcmin in declination);

Distance of φ1 Orionis from the Sun and relative movement

φ1 Orionis is distant 984.89 light years from the Sun and it is moving far from the Sun at the speed of 33 kilometers per second.

302.11 pc
984.89 ly
33 km/s
0.002 arcsec/year
-0.004 arcsec/year

Spectral properties of φ1 Orionis

φ1 Orionis belongs to spectral class B0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where φ1 Orionis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of φ1 Orionis. Attribution: Richard Powell / CC BY-SA

Alternative designations of φ1 Orionis

φ1 Orionis
(phi1 Orionis)