Psi Aquarii — Star in Aquarius
HIP 114855; Psi1 Aquarii; 91 Aquarii
Observe
1Physical Properties
Magnitude
4.21
Spectral Type
K0III
Star Color
Orange
(B-V 1.11)
Distance
67 ly
2Position & Identifiers
RA
23h 15m 53.5s
Dec
-09° 05' 16.0"
Constellation
Aquarius
(Aqr)
HR
8841
HIP
114855
HD
219449
Bayer
Psi1
Flamsteed
91 Aqr
Double Cat
16633
Querying VizieR catalog...
3How easy to spot?
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Medium+ | Medium+ | Medium |
| 50 mm finder 50mm finder | Easy | Easy | Easy |
| 150 mm telescope 150mm scope | Easy | Easy | Easy |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Visibility
Set a location in User Settings to see visibility data.
Best season
Aug – Oct
(peak: Sep)
Explore
6
Size Comparison
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7
Compare Stars
8
Spectral Classification
9
Hertzsprung-Russell Diagram
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10
Stellar Lifecycle
11
Blackbody Spectrum
12
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
13
Stellar Fusion
14
Exoplanets
1 known planet
View in 3D
View this system in the 3D Orrery
Interactive Keplerian orbits, procedural planet textures, habitable zone.
| Planet | Radius | Mass | Period | Distance |
|---|---|---|---|---|
| 91 Aqr b | 13.10R⊕ | 3.20M♃ | 181.4d | 144ly |
Habitable Zone
Size & Mass Comparison
About exoplanets — how we find them and which host stars you can observe
Discover
15Stellar Notes
BC, 10.0, 10.5v, K3V, 130y, a = 0.6", mean mass BC 0.35 solar. BC combined, 9.19V, +1.03(B-V), +0.93(U-B), CPM with | A. Component C is a close double, equal components, showing orbital motion.
Variously described as belonging to the 61 Cyg, Epsilon Ind or Zeta Her groups.
16
Light Travel Time Machine
17
Relativistic Travel
Survey Image
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Nearby in the Sky
Other targets within a few degrees — pan your scope a little and keep exploring.
Visibility scores assume a 150 mm Newton at Bortle 4.
Explore Nightbase
Related knowledge, tools, and stories — no observation planning required.
Arthur Eddington
1919 eclipse expedition confirming general relativity; first theory of stellar interiors; the Eddington limit
Biography
Aquarius
Mythology, bright stars, and deep-sky highlights.
Constellation
The Life of Stars
From birth in a nebula to spectacular death — how stars are born, shine, swell, and die, and how to read the clues in their starlight.
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