Star profile
55 Hydrae
Hot blue starWhat is 55 Hydrae
55 Hydrae is a blue-white B-type star 743 light-years away, lying in the long body of Hydra —the largest constellation in the sky, a celestial serpent stretched across more than a hundred degrees from horizon to horizon—. Its surface easily exceeds 10,000 K, the mark of a young, hot star whose life will be brief on stellar scales: B-class stars like this rarely last more than a few hundred million years before evolving onward.
Where it is and when to see it
55 Hydrae lies in the southern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is May: 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 55 Hydrae
- Constellation
- Hydra
- Apparent magnitude
- 5.61
- Distance
- 743.1 light years
- Coordinates (J2000)
- RA 221.844° · Dec -25.624°
- Catalogue
- HIP 72323 · HD 130158
A symbolic commemorative gift: neither the signature nor the chosen name implies ownership of the star or recognition by the IAU.
Other stars in Hydra
Hydra has 121 stars in Stelvia's catalogue. Here are a few of them.
- AlphardAlpha Hydrae1.99
- Gamma Hydrae2.99
- Zeta Hydrae3.11
- 19 Hydrae5.60
- 28 Hydrae5.60
- 1 Hydrae5.61
- HIP 443565.64
- HIP 625005.65