15 Lacertae — Star in Lacerta
Observe
1Physical Properties
Magnitude
4.94
Spectral Type
M0III
Star Color
Red
(B-V 1.56)
Distance
155 ly
2Position & Identifiers
RA
22h 52m 02.0s
Dec
+43° 18' 45.0"
Constellation
Lacerta
(Lac)
HR
8699
HIP
112917
HD
216397
Flamsteed
15 Lac
Double Cat
16325
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3How easy to spot?
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Medium | Medium | Hard+ |
| 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)
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5
Size Comparison
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6
Compare Stars
7
Spectral Classification
8
Hertzsprung-Russell Diagram
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9
Stellar Lifecycle
10
Blackbody Spectrum
11
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
12
Stellar Fusion
Discover
13Stellar Notes
AB, CPM. B, 12.2v at 26".
14
Light Travel Time Machine
15
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
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Arthur Eddington
1919 eclipse expedition confirming general relativity; first theory of stellar interiors; the Eddington limit
Biography
Lacerta
Mythology, bright stars, and deep-sky highlights.
Constellation
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.
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