π1 Orionis (pi1 Orionis)

Altitude: 17.5° Azimuth: 264.3° Direction: West

π1 Orionis is a multiple hypergiant star in the constellation of Orion.

π1 Orionis visual magnitude is 4.65. Because of its moderate brightness, π1 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 π1 Orionis:

Color of π1 Orionis ⬤

Magnitude of π1 Orionis 4.65

Class Hypergiant

VISIBILITY RIGHT NOW

π1 Orionis (pi1 Orionis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 17.5°
Azimuth: 264.3°
Direction: West

Celestial coordinates and finder chart of π1 Orionis

π1 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 π1 Orionis are provided in the following table:

Right Ascension J2000 04h 54m 53s

Declination J2000 +10° 09’ 02”

Galactic Longitude 189.34°

Galactic Latitude -20.25°

Constellation Orion

The simplified sky map below shows the position of π1 Orionis in the sky:

Finder chart π1 Orionis (pi1 Orionis) star

Simplified finder chart for π1 Orionis (pi1 Orionis).

Visibility of π1 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 π1 Orionis (pi1 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: 79.8° RISE 22:22

Max altitude: 48.7° TRANSIT 5:16

Azimuth: 280.2° SET 12:06

Digitized Sky Survey image of π1 Orionis

The image below is a photograph of π1 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 π1 Orionis is 0.046 arcsec per year in Right Ascension and -0.132 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of π1 Orionis. The red arrow shows the motion of π1 Orionis during the next 1000 years (0.77 arcmin in Right Ascension and -2.20 arcmin in declination);

Distance of π1 Orionis from the Sun and relative movement

π1 Orionis is distant 120.56 light years from the Sun and it is moving far from the Sun at the speed of 13 kilometers per second.

Distance (parsec) 36.98 pc

Distance (light year) 120.56 ly

Heliocentric radial velocity 13 km/s

Proper Motion RA 0.046 arcsec/year

Proper Motion Dec -0.132 arcsec/year

Spectral properties of π1 Orionis

π1 Orionis belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.

Absolute magnitude 1.81

Spectral Type A0V

Color Index (B-V) 0.09

Temperature of π1 Orionis 9125K

The red dot in the diagram below shows where π1 Orionis is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of π1 Orionis. Attribution: Richard Powell / CC BY-SA

π1 Orionis star system properties

π1 Orionis 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 π1 Orionis double sysyem:

Main star magnitude 4.65

Secondary star magnitude 8.85

Magnitude difference 4.2

Separation 171.6 arcsec

Alternative designations of π1 Orionis

Bayer designation π1 Orionis
(pi1 Orionis)

Flamsteed designation 7 Orionis

Henry Draper Catalogue HD31295

SAO Catalogue SAO94201

Hipparcos Catalogue HIP22845

Durchmusterung Catalogue BD+09 683

Support us

In Evidence

Other stars in Orion