archive / atlas record
Sirius
The brightest star system in Earth's night sky.
- classification
- Binary star system
- system
- Milky Way
Sirius combines a luminous main-sequence star with a faint white-dwarf companion, providing a nearby laboratory for stellar evolution.
- Class
- Binary star system
- Location / system
- Milky Way
- Distance
- 8.6 light-years from Earth
Only values with an established scientific consensus are listed. Where a quantity is uncertain or model-dependent, it is discussed in the sections below rather than stated as data.
Overview (starter entry, expanded review pending)
Sirius combines a luminous main-sequence star with a faint white-dwarf companion, providing a nearby laboratory for stellar evolution.
Spectroscopy, parallax and photometry
Sirius's spectrum constrains temperature and composition, parallax constrains distance, and changes in brightness or motion reveal variability, companions and evolutionary state.
- What remains least constrained about Sirius?Composition, internal structure, formation history or local environment can require different observations and may remain model-dependent.
Items above are unresolved. Hypotheses are labelled as such and are not presented as confirmed findings.
CDS Strasbourg // verified 28 September 2026