When is the best time to observe Avior?

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

Where is Avior located in the sky?

Avior lies in the constellation Carina at right ascension 08h 23m and declination -59° 31′.

What telescope do I need to split Avior?

Splitting Avior requires an aperture of roughly 550 mm or larger — the components are separated by about 0.4″ at magnitudes near 1.9. Larger apertures and steady seeing help resolve the pair cleanly.

Avior — Double Star in Carina

HIP 41037; Epsilon Carinae

Magnitude 1.8–1.9^m DoubleStar Carina (Car) Visible

Star Map + List + Plan

About Avior

Description

Avior is a binary star system at magnitude 1.86 in Carina, consisting of an orange giant (K3III) and a hot blue companion (B2V). Located about 630 light-years from Earth, the combined luminosity is roughly 6,500 times solar. The two stars orbit each other but are too close to resolve telescopically.

Observing Tips

Avior lies in the eastern part of Carina, forming one of the vertices of the False Cross asterism together with Iota Car, Delta Vel, and Kappa Vel. It appears as a warm-white star in a rich area of the southern Milky Way. Only visible from the southern hemisphere and low northern latitudes. Best observed January through May.

History

The name Avior was assigned by Her Majesty's Nautical Almanac Office in the 1930s for use in celestial navigation — it was one of several southern stars that needed unambiguous names for navigators. As part of the former Argo Navis constellation, Avior retains the Bayer designation Epsilon from the original scheme.

Fun Facts

Avior's name is one of the few star names that was invented in the 20th century specifically for practical navigation purposes, rather than inherited from Arabic or classical tradition. The False Cross that includes Avior has misled many navigators into confusing it with the true Southern Cross.

Observe

1Physical Properties

Magnitude 1.86

Range 1.86 - 2.04

Period 22.6 days

Variable Type Semi-Regular Variable (F-K Giant)

Spectral Type K3: III + B2: V

Star Color Orange (B-V 1.28) (reddened by dust)

Distance 601 ly

2Position & Identifiers

RA 08h 22m 30.8s

Dec -59° 30' 35.0"

Constellation Carina (Car)

HR 3307

HIP 41037

HD 71129

SAO 235932

Bayer Epsilon

SIMBAD Wikipedia

3How easy to split?

Primary 1.9 mag Companion 3.9 mag Separation 0.4″

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