Seginus — Star in Boötes
HIP 71075; Gamma Bootis; 27 Bootis
About Seginus
Description
Seginus is a white giant of spectral type A7III at magnitude 3.03 in Bootes. Located about 85 light-years from Earth, it has a luminosity of roughly 34 times solar. It forms the upper-left shoulder of the kite-shaped Bootes figure.
Observing Tips
Seginus lies at the upper shoulder of the Bootes kite, northeast of brilliant Arcturus. It helps define the constellation's distinctive shape. Best observed April through August when Bootes rides high.
History
The name Seginus may derive from the Latinized form of an Arabic name, though its exact etymology is uncertain. Bootes the Herdsman is an ancient constellation, recognized since at least Babylonian times.
Fun Facts
Bootes is one of the easiest constellations to identify thanks to Arcturus and its distinctive kite shape. Seginus helps complete the kite, making it a useful reference for constellation identification.
Observe
1Physical Properties
2Position & Identifiers
3How easy to spot?
| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Easy | Easy | Easy |
| 50 mm finder 50mm finder | Easy | Easy | Easy |
| 150 mm telescope 150mm scope | Easy | Easy | Easy |
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Visibility
Set a location in User Settings to see visibility data.
5Survey Image
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Explore
7
Size Comparison
8
Compare Stars
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Spectral Classification
10
Hertzsprung-Russell Diagram
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
16
Light Travel Time Machine
17
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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