Observe
1Physical Properties
Magnitude
4.11
Range
3.99 - 4.20
Variable Type
Semi-Regular Variable
Spectral Type
M4.5IIIa
bright giant
Star Color
Red
(B-V 1.57)
2Position & Identifiers
RA
22h 29m 45.5s
Dec
-43° 44' 58.0"
Constellation
Grus
(Gru)
HR
8560
HIP
111043
HD
213080
SAO
231161
Bayer
Delta2
Variable ID
Del2 Gru
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
Jul – Sep
(peak: Aug)
5Survey Image
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Explore
7
Size Comparison
Querying VizieR for stellar data…
8
Compare Stars
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
Discover
15Stellar Notes
Lb? 3.99 - 4.20V.
Companion optical. B-V for combined light +1.57.
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.
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1919 eclipse expedition confirming general relativity; first theory of stellar interiors; the Eddington limit
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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
Grus
Mythology, bright stars, and deep-sky highlights.
Constellation
