Star profile
Omicron Aquarii
Variable starWhat is Omicron Aquarii
Omicron Aquarii is a variable blue-white B-type star more than 430 light-years away, in the constellation of the Water Bearer. It belongs to the so-called Be stars, suns that spin so fast they periodically eject a gas disk around their equator, causing small fluctuations in their brightness. It is a hot flame that breathes slowly, in a sky corner where Aquarius pours his invisible jar toward the south.
Where it is and when to see it
Omicron Aquarii lies in the southern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is August, when it culminates around midnight.
- From London it culminates about 36° above the horizon.
- From New York it culminates about 47° above the horizon.
- From Sydney it culminates about 58° above the horizon.
It can be seen from anywhere south of 88° N.
It ranks no. 27 in brightness among the 99 stars of Aquarius in our catalogue. To find it, start from Sadalsuud, the brightest: it lies about 9° away (a fist at arm's length covers about 10°).
The light you see today left it about 440 years ago.
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Astronomical data for Omicron Aquarii
- Constellation
- Aquarius
- Apparent magnitude
- 4.74
- Distance
- 435.5 light years
- Coordinates (J2000)
- RA 330.829° · Dec -2.155°
- Catalogue
- HIP 108874 · HD 209409
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Other stars in Aquarius
Aquarius has 99 stars in Stelvia's catalogue. Here are a few of them.
- SadalsuudBeta Aquarii2.90
- SadalmelikAlpha Aquarii2.95
- SkatDelta Aquarii3.27
- 101 Aquarii4.70
- 89 Aquarii4.71
- Mu Aquarii4.73
- Pi Aquarii4.80
- Sigma Aquarii4.82