31 Orionis is a variable and double giant star in the constellation of Orion.
31 Orionis visual magnitude is 4.71. Because of its moderate brightness, 31 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 31 Orionis:
Celestial coordinates and finder chart of 31 Orionis
31 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 31 Orionis are provided in the following table:
The simplified sky map below shows the position of 31 Orionis in the sky:
Visibility of 31 Orionis from your location
Location: Greenwich, United Kingdom
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Today's 31 Orionis rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):
Digitized Sky Survey image of 31 Orionis
The image below is a photograph of 31 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 31 Orionis is 0.004 arcsec per year in Right Ascension and -0.023 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of 31 Orionis from the Sun and relative movement
31 Orionis is distant 455.94 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.
Spectral properties of 31 Orionis
31 Orionis belongs to spectral class K5 and has a luminosity class of III corresponding to a giant star.
The red dot in the diagram below shows where 31 Orionis is situated in the Hertzsprung–Russell diagram.
31 Orionis star system properties
31 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 31 Orionis double sysyem: