Pi2 Orionis
Pi2 Orionis is a single star in the Orion constellation that you can see with the naked eye (apparent magnitude 4.35). It lies about 224 light-years away.
Key facts:
- Type: A-type main-sequence star, class A1 Vn (the 'n' means broad spectral lines from fast rotation)
- Size and shape: Radius about 2.7 times that of the Sun; rapid spin makes it oblate, with the equator about 13% larger than the poles
- Temperature and brightness: Surface temperature ~9,457 K; luminosity ~70 times the Sun’s
- Spin: Very fast, v sin i ≈ 261 km/s
- Metallicity and gravity: Metallicity [Fe/H] ≈ -0.20; surface gravity log g ≈ 4.00
- Distance and motion: Parallax ~14.53 mas → ~224 light-years away; small proper motion (RA +1.41 mas/yr, Dec −29.91 mas/yr)
- Binary status: Not confirmed as a binary
Other names include π2 Ori and 2 Orionis.
This page was last edited on 3 February 2026, at 06:44 (CET).