About Deneb el Okab
Description
Deneb el Okab is a white main-sequence star of spectral type A0Vn at magnitude 2.99, the third brightest star in Aquila. Located about 83 light-years from Earth, it has a luminosity of roughly 39 times solar. The 'n' in its spectral type indicates rapid rotation causing broadened spectral lines.
Observing Tips
Deneb el Okab lies south of Altair in Aquila, in the tail region of the Eagle. It is a white star forming part of the eagle's body below the prominent Altair-Tarazed-Alshain trio. Best observed June through November.
History
The name Deneb el Okab comes from the Arabic 'dhanab al-'uqab,' meaning 'the tail of the eagle.' Several stars in Aquila share the 'Deneb' prefix, all referencing the tail of the bird.
Fun Facts
Aquila contains an unusually high number of 'Deneb' (tail) stars in its Arabic nomenclature, reflecting the prominence of the eagle's tail in the traditional constellation figure.
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.
Explore
6
Size Comparison
7
Compare Stars
8
Spectral Classification
9
Hertzsprung-Russell Diagram
10
Stellar Lifecycle
11
Blackbody Spectrum
12
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
13
Stellar Fusion
Discover
14Stellar Notes
15
Light Travel Time Machine
16
Relativistic Travel
Survey Image
Loading survey image…
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
Related knowledge, tools, and stories — no observation planning required.
