When is the best time to observe HIP 50739?

HIP 50739 is best observed from January through March, with peak visibility during February when it transits around midnight in the Northern Hemisphere.

Where is HIP 50739 located in the sky?

HIP 50739 lies in the constellation Hydra at right ascension 10h 22m and declination -22° 32′.

What telescope do I need to split HIP 50739?

Splitting HIP 50739 requires an aperture of roughly 150 mm or larger — the components are separated by about 1.8″ at magnitudes near 6.5. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 50739 — Double Star in Hydra

Magnitude 6.5^m DoubleStar Hydra (Hya) Visible

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Observe

1Physical Properties

Magnitude 6.51

Spectral Type A0

Star Color Blue-white (B-V 0.07)

Distance 544 ly

2Position & Identifiers

RA 10h 21m 36.0s

Dec -22° 31' 42.0"

Constellation Hydra (Hya)

HR 4073

HIP 50739

HD 89828

SAO 178723

Double Cat 7739

SIMBAD

3How easy to split?

Primary 6.5 mag Companion 8.5 mag Separation 1.8″

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

Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Jan – Mar (peak: Feb)

5Multiple Star System

Separation 1.8″

Companion Mag 8.5

Position Angle 186°

Star Colors A: Blue-white B: Yellow-white

Discoverer BU 219

Separation over time

Measured 1874 → 2016 (142 y)

Separation drift 1.2" → 1.8" (+0.60")

Rate +0.0042" / y

PA drift 194° → 186° (-8°, -0.056°/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.