Bellatrix
Observer: GDAA
Spectrum Data
FITS Header Metadata
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| Key | Value |
|---|---|
| SIMPLE | True |
| BITPIX | -32 |
| NAXIS | 1 |
| NAXIS1 | 2971 |
| CRPIX1 | 1 |
| CDELT1 | 1.44750392926662 |
| CRVAL1 | 3691.50170898438 |
| CTYPE1 | Wavelength |
| CUNIT1 | Angstrom |
| SWCREATE | RSpec 2.1.1.18 |
| VERSION | RSpec 2.1.1.18 |
| OBSERVER | Grzegorz Duszanowicz |
| BSS_SITE | Sandvreten Observatory L11 |
| BSS_INST | T41 |
| OBJNAME | Gamma Ori |
| DATE-OBS | 2026-01-29T20:13:07 |
| 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 | Bellatrix |
| Observer | GDAA |
| Site | Sandvreten Observatory |
| Equipment | T41 |
| Observation Date | 2026-01-31 12:53 |
| Julian Date | 2461072.03681 |
| Created | 2026-01-31 12:53 |
| Updated | 2026-02-11 16:06 |
Notes
Gamma Ori. The spectral types for O and early B stars were defined more rigorously in 1971 and Bellatrix was used as a standard for the B2 III type.[5] The expected brightness of Bellatrix from this spectral type is about one magnitude brighter than calculated from its apparent magnitude and Hipparcos distance.[23] Analysis of the observed characteristics of the star indicate that it should be a B2 main sequence star, not the giant that it appears from its spectral type.[6] Close analysis of high resolution spectra suggest that it is a spectroscopic binary composed of two similar stars less luminous than a B2 giant.[24] Bellatrix is a massive star with about 8.6 times the mass[9] and 6.4 times the radius of the Sun.[10] As a massive star, this star will evolve faster than the Sun, currently it has an estimated age of approximately 25 million years.[9] The hydrogen should be exhausted in seven million years, after that Bellatrix will expand and cool. It may end its life in a supernova.[25] The effective temperature of the outer envelope of this star is 22,000 K,[11] which is considerably hotter than the 5,772 K on the Sun. This high temperature gives this star the blue-white hue that occurs with B-type stars.[26] It shows a projected rotational velocity of around 52 km/s.[27]