About Murzim
Description
Murzim (also spelled Mirzam) is a blue giant of spectral type B1II-III at magnitude 1.98 in Canis Major. Located about 500 light-years from Earth, it has a luminosity of roughly 26,600 times solar. Murzim is a Beta Cephei variable, pulsating with a period of about 6 hours, though the brightness change is very small.
Observing Tips
Murzim lies about 5 degrees west of Sirius, making it easy to find. It appears as a bright blue-white star that 'heralds' the rising of Sirius. Look for it as the first bright star to rise before Sirius clears the horizon. Best observed December through March.
History
The name Murzim (or Mirzam) comes from the Arabic 'al-murzim,' meaning 'the announcer,' because it rises shortly before Sirius and thus 'announces' the arrival of the brightest star. This herald-role gave it significance in cultures that closely watched for Sirius's appearance.
Fun Facts
Murzim is intrinsically over 1,000 times more luminous than Sirius, yet appears fainter because it is nearly 60 times farther away. Its role as Sirius's announcer was important in ancient Egypt, where the heliacal rising of Sirius marked the start of the flood season.
Observe
1Physical Properties
2Position & Identifiers
3How easy to split?
| Telescope | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| 80 mm refractor 80mm refr. | Medium | Hard+ | Hard |
| 150 mm Newton 150mm Newt. | Easy | Medium+ | Medium+ |
| Celestron C8 (203 mm SCT) C8 203mm | Easy | Easy | Medium+ |
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Visibility
Set a location in User Settings to see visibility data.
5Light Curve
6Multiple Star System
Separation over time
Slow change over generations — observable in lifetime comparisons.
Measured from the WDS observational archive. No orbital solution has been derived — most likely the period is too long to fit an orbit to the available measurement arc.
Eyepiece View
A: 2.0 · B: 10.5 · Sep: 186.1″ · PA: 340° · N up, E right
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″
Explore
8
Size Comparison
9
Compare Stars
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Spectral Classification
11
Hertzsprung-Russell Diagram
12
Stellar Lifecycle
13
Blackbody Spectrum
14
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
15
Stellar Fusion
Discover
16Stellar Notes
17
Light Travel Time Machine
18
Relativistic Travel
Nearby in the Sky
Other targets within a few degrees — pan your scope a little and keep exploring.
Visibility scores assume a 150 mm Newton at Bortle 4.
Explore Nightbase
Related knowledge, tools, and stories — no observation planning required.
