Capella
Observer: GDAA
Spectrum Data
FITS Header Metadata
Show FITS Header
| Key | Value |
|---|---|
| SIMPLE | True |
| BITPIX | -32 |
| NAXIS | 1 |
| NAXIS1 | 2939 |
| CRPIX1 | 1 |
| CDELT1 | 1.44932021211815 |
| CRVAL1 | 3741.73413085938 |
| CTYPE1 | Wavelength |
| CUNIT1 | Angstrom |
| SWCREATE | RSpec 2.3.1.76 |
| VERSION | RSpec 2.3.1.76 |
| OBSERVER | Grzegorz Duszanowicz |
| BSS_SITE | Sandvreten Observatory |
| BSS_INST | T41 |
| OBJNAME | Capella |
| DATE-OBS | 2026-01-31T18:41:13 |
| EXPTIME | 60 |
| BSS_VHEL | 0 |
FITS Spectral Image
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Calibrated Spectrum
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Observation Image
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Metadata
| Field | Value |
|---|---|
| Object Name | Capella |
| Observer | GDAA |
| Site | Sandvreten Observatory |
| Equipment | T41 |
| Observation Date | 2026-01-31 18:41 |
| Julian Date | 2461072.27847 |
| Exposure Time | 60.0 seconds |
| Created | 2026-02-15 17:08 |
| Updated | 2026-02-15 17:08 |
Notes
Capella Aa and Capella Ab have exhausted their core hydrogen, and cooled and expanded, moving off the main sequence. They are in a very tight circular orbit about 0.74 AU apart, and orbit each other every 104 days. Capella Aa is the cooler and more luminous of the two with spectral class G8III; it is 78.7±4.2 times the Sun's luminosity and 11.98±0.57 times its radius. An aging red clump star, it is fusing helium to carbon and oxygen in its core. Capella Ab is slightly smaller and hotter and of spectral class G0III; it is 72.7±3.6 times as luminous as the Sun and 8.83±0.33 times its radius. It is in the Hertzsprung gap, corresponding to a brief subgiant evolutionary phase as it expands and cools to become a red giant