π Night Sky Observer
Explore the night sky in 3D. Adjust time and date to see how the sky changes.
Selected Star
Click on a star to select it
π₯ Blackbody Spectrum Simulator
Adjust the temperature to match your star's color. This determines the surface temperature.
π¬ Absorption Spectrum Analysis
Analyze the star's absorption spectrum to determine its spectral class. Compare with reference spectra.
Determine Spectral Type
Select the spectral type that best matches the star's spectrum.
π Hertzsprung-Russell Diagram
Drag the star, use sliders, or type a temperature to position your star on the H-R diagram.
π From Previous Steps
Derived Properties
π Observation Notebook
| Name | -- | -- | |
| ID | -- | -- | |
| Constellation | -- | -- | |
| Apparent Magnitude | -- | -- | |
| Temperature (K) | -- | -- | |
| Spectral Class | -- | -- | |
| Luminosity Class | -- | -- | |
| H-R Diagram Position | -- | -- | |
| Luminosity (Lβ) | -- | -- | |
| Radius (Rβ) | -- | -- | |
| Absolute Magnitude | -- | -- | |
| Distance (Light Years) | -- | -- |
β οΈ Please record the distance in your notebook before proceeding.
π Distance Calculator
Compare apparent and absolute magnitude to calculate the distance to your star.
Apparent Magnitude (m)
How bright the star appears from Earth
Absolute Magnitude (M)
Brightness at 10 parsecs (32.6 ly)
Distance Modulus
m - M = 5Β·logββ(d/10)
π― Calculated Distance to Star
π Results Comparison
| Observations | Actual Values | Error Analysis | |
|---|---|---|---|
| Name | -- | -- | |
| ID | -- | -- | |
| Constellation | -- | -- | |
| Apparent Magnitude | -- | -- | |
| Temperature (K) | -- | -- | |
| Spectral Class | -- | -- | |
| Luminosity Class | -- | -- | |
| H-R Diagram Position | -- | -- | |
| Luminosity (Lβ) | -- | -- | |
| Radius (Rβ) | -- | -- | |
| Absolute Magnitude | -- | -- | |
| Distance (Light Years) | -- | -- |
π Results & Accuracy
Compare your measurements and classifications with the actual star data.
π H-R Diagram Comparison
Your estimated position (gold ring) vs. the star's actual position (solid circle)