Star profile
Psi 2 Aquarii
Variable starWhat is Psi 2 Aquarii
Psi-2 Aquarii is a variable of the peculiar Lambda Eridani type: a blue star spinning at 341 km/s and pulsing every twenty-six hours with an almost imperceptible rhythm. Centrifugal force deforms it and tears a faint veil of gas from its equator. Its light crossed four centuries before reaching the celestial Water-Bearer.
Where it is and when to see it
Psi 2 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 September, when it culminates around midnight.
- From London it culminates about 29° above the horizon.
- From New York it culminates about 40° above the horizon.
- From Sydney it culminates about 65° above the horizon.
It can be seen from anywhere south of 81° N.
It ranks no. 17 in brightness among the 99 stars of Aquarius in our catalogue. To find it, start from Sadalsuud, the brightest: it lies about 27° away (a fist at arm's length covers about 10°).
The light you see today left it about 400 years ago.
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Astronomical data for Psi 2 Aquarii
- Constellation
- Aquarius
- Apparent magnitude
- 4.41
- Distance
- 401.7 light years
- Coordinates (J2000)
- RA 349.476° · Dec -9.183°
- Catalogue
- HIP 115033 · HD 219688
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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
- Psi 1 Aquarii4.24
- Iota Aquarii4.29
- 99 Aquarii4.38
- 3 Aquarii4.43
- 86 Aquarii4.48