Star profile
Sigma Arietis
Hot blue starWhat is Sigma Arietis
Sigma Arietis is a blue-white star, three hundred times brighter than the Sun, young —only thirty-six million years old— and fast-spinning. It belongs to the Cas-Tau OB association, a scattered family of stellar sisters sharing a single slow orbit through the galaxy.
Where it is and when to see it
Sigma Arietis lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is November, when it culminates around midnight.
- From London it culminates about 54° above the horizon.
- From New York it culminates about 64° above the horizon.
- From Sydney it culminates about 41° above the horizon.
It can be seen from anywhere north of 75° S.
It ranks no. 25 in brightness among the 57 stars of Aries in our catalogue. To find it, start from Hamal, the brightest: it lies about 13° away (a fist at arm's length covers about 10°).
The light you see today left it about 490 years ago.
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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 Sigma Arietis
- Constellation
- Aries
- Apparent magnitude
- 5.52
- Distance
- 494.2 light years
- Coordinates (J2000)
- RA 42.873° · Dec 15.082°
- Catalogue
- HIP 13327 · HD 17769
A symbolic commemorative gift: neither the signature nor the chosen name implies ownership of the star or recognition by the IAU.
Other stars in Aries
Aries has 57 stars in Stelvia's catalogue. Here are a few of them.
- HamalAlpha Arietis2.01
- SheratanBeta Arietis2.64
- Bharani3.61
- 52 Arietis5.45
- Xi Arietis5.48
- 64 Arietis5.50
- 62 Arietis5.55
- 21 Arietis5.57