When is the best time to observe HIP 80399?

HIP 80399 is best observed from April through June, with peak visibility during May when it transits around midnight in the Northern Hemisphere.

Where is HIP 80399 located in the sky?

HIP 80399 lies in the constellation Scorpius at right ascension 16h 25m and declination -29° 42′.

What telescope do I need to split HIP 80399?

Splitting HIP 80399 requires an aperture of roughly 100 mm or larger — the components are separated by about 4.0″ at magnitudes near 5.8. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 80399 — Double Star in Scorpius

Observable Double Star Excellent (61/100)

Sep: 4.0", Companion: mag 6.6

Magnitude 5.8^m DoubleStar Scorpius (Sco) Visible

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Observe

1Physical Properties

Magnitude 5.84

Spectral Type G0IV subgiant

Star Color Yellow (B-V 0.59)

Distance 91 ly

2Position & Identifiers

RA 16h 24m 39.7s

Dec -29° 42' 17.0"

Constellation Scorpius (Sco)

HR 6106

HIP 80399

HD 147723

SAO 184369

Double Cat 10035

SIMBAD

3How easy to split?

Primary 5.8 mag Companion 6.6 mag Separation 4.0″

Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Medium+	Medium+	Medium+
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 Apr – Jun (peak: May)

5Multiple Star System

Separation 4.0″

Companion Mag 6.6

Companion Sp G0V

Position Angle 359°

Star Colors A: Yellow B: Yellow

Discoverer H N 39

Notes

Binary with HR 6105. Mag. and colors for combined light, 5.41V, +0.59(B-V), +0.12(U-B).

Separation over time

Measured 1834 → 2018 (184 y)

Separation drift 4.0" → 4.0" (+0.00")

Rate +0.0000" / y

PA drift 352° → 359° (+7°, +0.038°/y)

Essentially fixed on human timescales — the same view your grandchildren will see.

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.