30 Herculis — Variable Star in Hercules
Showpiece (77/100)
Observe
1Physical Properties
Magnitude
5.04
Range
4.30 - 5.50
Period
89 days
Variable Type
Semi-Regular Variable (Late-type Giant)
Spectral Type
M6-III
Star Color
Red
(B-V 1.52)
Distance
181 ly
2Position & Identifiers
RA
16h 28m 38.5s
Dec
+41° 52' 54.0"
Constellation
Hercules
(Her)
HR
6146
HIP
80704
HD
148783
SAO
46108
Flamsteed
30 Her
Variable ID
g Her
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3How easy to follow?
Magnitude
4.3 – 6.3 mag
Amplitude
2.0 mag
Period
89.2 d
Type
SRB
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Hard | V. hard+ | V. 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
Apr – Jun
(peak: May)
5Survey Image
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6Light Curve
7Comparison Stars for 30 Her (4.3–6.3)
Nearby stable stars for estimating brightness (AAVSO)
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8
Size Comparison
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9
Compare Stars
10
Spectral Classification
11
Hertzsprung-Russell Diagram
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12
Stellar Lifecycle
13
Blackbody Spectrum
14
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
15
Stellar Fusion
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16Stellar Notes
SRb 4.3 - 6.3v, 5.7 - 7.2p, 89.2d. Also slow var. of about 875d and aperiodic superposed cycles 5 - 15d.
17
Light Travel Time Machine
18
Relativistic Travel
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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Article
Hercules
Mythology, bright stars, and deep-sky highlights.
Constellation
