Psi Aquarii — Star in Aquarius
HIP 114855; Psi1 Aquarii; 91 Aquarii
Observe
1Physical Properties
Magnitude
4.21
Spectral Type
K0III
giant
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
SAO
146598
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
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Best season
Aug – Oct
(peak: Sep)
5Survey Image
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7
Size Comparison
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8
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9
Spectral Classification
10
Hertzsprung-Russell Diagram
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11
Stellar Lifecycle
12
Blackbody Spectrum
13
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
14
Stellar Fusion
15
Exoplanets
1 known planet
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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
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16Stellar 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.
17
Light Travel Time Machine
18
Relativistic Travel
Nearby in the Sky
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Visibility scores assume a 150 mm Newton at Bortle 4.
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The Hertzsprung-Russell Diagram — Reading Stars Like a Map
The HR diagram turns the night sky into a physics map: every named star has a spot, every spot tells you mass, age, and fate. A guide for amateur observers.
Article
Aquarius
Mythology, bright stars, and deep-sky highlights.
Constellation
