Rho Coronae Borealis — Double Star in Corona Borealis
Observe
1Physical Properties
2Position & Identifiers
3How easy to split?
| Telescope | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| 80 mm refractor 80mm refr. | Medium | Hard+ | Hard |
| 150 mm Newton 150mm Newt. | Easy | Medium+ | Medium |
| Celestron C8 (203 mm SCT) C8 203mm | Easy | Easy | Medium+ |
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Visibility
Set a location in User Settings to see visibility data.
5Multiple Star System
Separation over time
Apparent motion is significant on a human timescale — worth revisiting in a decade.
Measured from the WDS observational archive. No orbital solution has been derived — most likely the period is too long to fit an orbit to the available measurement arc.
Eyepiece View
A: 5.4 · B: 10.5 · Sep: 147.8″ · PA: 45° · N up, E right
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″
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
14
Exoplanets
4 known planets
View in 3D
| Planet | Radius | Mass | Period | Distance |
|---|---|---|---|---|
| rho CrB e | 1.77R⊕ | 3.8M⊕ | 12.9d | 57ly |
| rho CrB b | 13.70R⊕ | 1.09M♃ | 39.8d | 57ly |
| rho CrB c | 5.78R⊕ | 28.2M⊕ | 102.2d | 57ly |
| rho CrB d | 4.94R⊕ | 21.6M⊕ | 282.2d | 57ly |
Habitable Zone
Size & Mass Comparison
About exoplanets — how we find them and which host stars you can observe
Discover
15
Light Travel Time Machine
16
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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Related knowledge, tools, and stories — no observation planning required.
