Star profile
Theta 1 Orionis
Variable starWhat is Theta 1 Orionis
θ¹ Orionis is the centrepiece of the Trapezium, the cluster of young stars lighting the heart of the Great Orion Nebula, one of the closest and most photographed stellar nurseries. A hot variable O-type star, she ionises the surrounding gas and lends it the pinkish glow that makes the nebula famous in any amateur telescope.
Where it is and when to see it
Theta 1 Orionis lies in the southern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is December: the Sun sits at the opposite point of the sky and the star culminates around midnight. How high it climbs above the horizon depends on the latitude you watch from.
It opens in your browser. Free, no account, nothing to install.
The signature wall
Stelvia's sky works like a signature wall: anyone can leave their name and a message on a real star, and that signature goes up on the map for everyone to read. Signing is free.
A signature without a lock can be replaced by someone else's. The lock makes the signature permanent and lets you choose a symbolic name for the star, always shown next to the star's catalogue identifier. How the lock works
If you don't have an account yet, we'll ask for an email to confirm it's you: we send you a link and that's it, no password.
A public signature from a real person. The chosen name is a symbolic denomination within Stelvia, with no official standing or IAU recognition: the sky is not for sale and belongs to no one.
Astronomical data for Theta 1 Orionis
- Constellation
- Orion
- Apparent magnitude
- 4.98
- Distance
- 326200.0 light years
- Coordinates (J2000)
- RA 83.816° · Dec -5.387°
- Catalogue
- HIP 26220 · HD 37020
A symbolic commemorative gift: neither the signature nor the chosen name implies ownership of the star or recognition by the IAU.
Other stars in Orion
Orion has 128 stars in Stelvia's catalogue. Here are a few of them.
- RigelBeta Orionis0.18
- BetelgeuseAlpha Orionis0.45
- BellatrixGamma Orionis1.64
- HIP 300934.91
- HIP 267364.95
- 69 Orionis4.95
- Theta 2 Orionis4.98
- 23 Orionis4.99