Draft:Siwarha (α Orionis B)
Submission declined on 25 July 2025 by Sksatsuma (talk).
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Comment: Based on the WP:NASTRO requirements for hypothetical objects, I don't think there are enough independent sources provided to demonstrate notability in this draft yet. sksatsuma 09:14, 25 July 2025 (UTC)
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 55m 10.30536s |
| Declination | +07° 24′ 25.4304″ |
| Apparent magnitude (V) | +6.50 (6.0-7.0) |
| Distance | 400-600 ly |
| Spectral type | F-Type Pre-main-sequence |
| Other designations | |
| α Orionis B | |
Siwarha is a hypothetical F-type pre-main-sequence star companion star to the red supergiant Betelgeuse, located in the constellation of Orion. [1] It was confirmed in 2025 using the Gemini Observatory instrument ‘Alopeke with high resolution imaging. It is estimated to have roughly 1.5 solar masses and orbits approximately 4 astronomical units from Betelgeuse. [1] Its presence is believed to explain Betelgeuse’s observed six-year periodic fluctuations in brightness, a phenomenon long suspected to be caused by an unseen stellar companion.[1]
Nomenclature
[edit]Steve Howell, credited for recognizing that the observatory's instruments were capable of such a task, proposed a name. The name "Betelgeuse" derives from Arabic, meaning “the hand of al-Jawza’," a figure of an old Arabian legend. Howell's team unofficially named the hypothetical companion, "Siwarha," meaning "her bracelet," symbolizing its close position to its companion. [2] If confirmed, the star would be given the Bayer designation "α Orionis B."
Discovery
[edit]Siwarha was first resolved in 2025 using the ‘Alopeke speckle imaging system at the Gemini Observatory in Hawaii. The companion had been predicted for decades as a possible explanation for Betelgeuse's semiregular light curve variations. The star’s relatively close orbit (around 4 AU) and faint magnitude made it difficult to detect with earlier instruments.[1]
References
[edit]- ^ a b c d "Gemini North Discovers Long-Predicted Stellar Companion of Betelgeuse". NOIRlab. 21 July 2025.
- ^ McKinnon, Aaron (23 July 2025). "NASA Scientist Finds Predicted Companion Star to Betelgeuse". NASA.gov.
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