When is the best time to observe HIP 84827?

HIP 84827 is best observed from May through July, with peak visibility during June when it transits around midnight in the Northern Hemisphere.

Where is HIP 84827 located in the sky?

HIP 84827 lies in the constellation Apus at right ascension 17h 20m and declination -70° 03′.

What telescope do I need to split HIP 84827?

Splitting HIP 84827 requires an aperture of roughly 600 mm or larger — the components are separated by about 0.6″ at magnitudes near 6.5. The companion is about 3.2 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 84827 — Double Star in Apus

Magnitude 6.5^m DoubleStar Apus (Aps) Visible

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Observe

1Physical Properties

Magnitude 6.53

Spectral Type G0-1IV:

Star Color Yellow (B-V 0.60)

2Position & Identifiers

RA 17h 20m 12.8s

Dec -70° 02' 44.0"

Constellation Apus (Aps)

HR 6400

HIP 84827

HD 155875

SAO 253870

SIMBAD

3How easy to split?

Primary 6.5 mag Companion 9.7 mag Separation 0.6″

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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+

Easy Medium Hard Very hard Impossible

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

To reach "Medium" at Bortle 3, you'd need at least a 600 mm reflector.

4Visibility

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Best season May – Jul (peak: Jun)

5Multiple Star System

Separation 0.6″

Companion Mag 9.7

Position Angle 127°

Star Colors A: Yellow B: Orange

Discoverer I 104

Separation over time

Measured 1896 → 2021 (125 y)

Separation drift 2.0" → 0.60" (-1.40")

Rate -0.0112" / y

PA drift 135° → 127° (-8°, -0.064°/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.