Star profile
Omicron 1 Orionis
Variable starWhat is Omicron 1 Orionis
Omicron-1 Orionis is a remarkable rarity: a red giant of the unusual S class, an intermediate stage on the road from an ordinary M giant to a true carbon star, where zirconium begins to displace titanium in its atmosphere. A semi-regular variable, it drifts between magnitudes 4.65 and 4.88 every 31 days. At 651 light-years it pulses discreetly, far from the Belt's glitter, on Orion's northwestern shoulder.
Where it is and when to see it
Omicron 1 Orionis lies in the northern 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.
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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
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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 Omicron 1 Orionis
- Constellation
- Orion
- Apparent magnitude
- 4.71
- Distance
- 651.1 light years
- Coordinates (J2000)
- RA 73.133° · Dec 14.251°
- Catalogue
- HIP 22667 · HD 30959
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
- Pi 1 Orionis4.64
- Chi 2 Orionis4.64
- 11 Orionis4.65
- 31 Orionis4.71
- 22 Orionis4.72