When is the best time to observe Mintaka?

Mintaka is best observed from November through January, with peak visibility during December when it transits around midnight in the Northern Hemisphere.

Where is Mintaka located in the sky?

Mintaka lies in the constellation Orion at right ascension 05h 32m and declination -00° 18′.

What telescope do I need to split Mintaka?

Splitting Mintaka requires an aperture of roughly 60 mm or larger — the components are separated by about 51.8″ at magnitudes near 2.2. The companion is about 4.6 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Mintaka — Double Star in Orion

Delta Ori (BS1852)

Observable Double Star Excellent (66/100)

Sep: 51.8", Companion: mag 6.8

DoubleStar Orion (Ori) Visible

Star Map + List + Plan

About Mintaka

Description

Mintaka is the westernmost star of Orion's Belt at magnitude 2.23, a blue giant of spectral type O9.5II located about 1,200 light-years from Earth. It is actually a complex multiple star system with at least five components. Mintaka is a slightly variable eclipsing binary, with brightness variations of about 0.2 magnitude over a period of 5.73 days.

Observing Tips

Mintaka is the right (western) star of Orion's Belt. It lies almost exactly on the celestial equator, making it visible from virtually every inhabited location on Earth. A small telescope reveals a fainter companion about 53 arcseconds away. Best observed December through March.

History

The name Mintaka comes from the Arabic 'mintaqa,' meaning 'the belt.' Because it sits almost on the celestial equator (within 0.3°), Mintaka rises almost exactly due east and sets almost exactly due west from any location, making it useful for orientation since ancient times.

Fun Facts

Mintaka's position on the celestial equator means it is the most useful star for determining due east and due west — wherever you are on Earth, Mintaka rises and sets within a fraction of a degree of true east and west.

Observe

1Physical Properties

Magnitude 2.23

Range 2.2 - 2.32

Period 5.7 days

Variable Type Eclipsing Binary (Algol-type)

Spectral Type O9III

Star Color Blue (B-V -0.22)

Distance 1,080 ly

2Position & Identifiers

RA 05h 32m 00.4s

Dec -00° 17' 57.0"

Constellation Orion (Ori)

HR 1852

HIP 25930

HD 36486

Bayer Delta

Flamsteed 34 Ori

Variable ID Del Ori

Double Cat 4134

SIMBAD Wikipedia

3How easy to split?

Primary 2.2 mag Companion 6.8 mag Separation 51.8″

Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Easy	Easy	Easy
150 mm Newton 150mm Newt.	Easy	Easy	Easy
Celestron C8 (203 mm SCT) C8 203mm	Easy	Easy	Easy

Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

4Visibility

Set a location in User Settings to see visibility data.

Best season Nov – Jan (peak: Dec)

5Light Curve

6Multiple Star System Triple

Components 3 (triple)

Component IDs AC

Separation 51.8″

Companion Mag 6.8

Companion Sp K

Position Angle 0°

Star Colors A: Blue C: Red

Discoverer STFA 14

Notes

Binary with C = HR 1851. Component B, 14.0v at 33".

Separation over time

Measured 1777 → 2023 (246 y)

Separation drift 50.0" → 51.8" (+1.80")

Rate +0.0073" / y

PA drift 0° → 0° (+0°, +0.000°/y)

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.