Zuben El Akribi — Variable Star in Libra
HIP 73473; Delta Librae; 19 Librae
Excellent (70/100)
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1Physical Properties
Magnitude
4.92
Range
4.9 - 5.9
Period
2.3 days
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
B9.5V
Star Color
Blue-white
(B-V 0.00)
Distance
163 ly
2Position & Identifiers
RA
15h 00m 58.4s
Dec
-08° 31' 08.0"
Constellation
Libra
(Lib)
HR
5586
HIP
73473
HD
132742
SAO
140270
Bayer
Delta
Flamsteed
19 Lib
Variable ID
Del Lib
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3How easy to follow?
Magnitude
4.9 – 5.9 mag
Amplitude
1.0 mag
Period
2.33 d
Type
EA/SD
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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 | Medium+ | Medium+ | Medium+ |
| 150 mm telescope 150mm scope | Medium+ | Medium+ | Medium+ |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Visibility
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Best season
Apr – Jun
(peak: May)
5Survey Image
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6Light Curve
7Comparison Stars for Zuben El Akribi (4.9–5.9)
Nearby stable stars for estimating brightness (AAVSO)
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8
Size Comparison
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9
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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
EA 4.92 - 5.90V, 2.32735297d, period may vary. Component A of quadruple system. Contact binary.
2.3273d, K 78.3k/s, V0 -36.4k/s, asini 2.50. Orbital period variable. Masses 2.6, 1.1 solar.
Zuben Elakribi.
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
Libra
Mythology, bright stars, and deep-sky highlights.
Constellation
