When is the best time to observe HIP 89020?

HIP 89020 is best observed from May through July, with peak visibility during June when it transits around midnight in the Northern Hemisphere.

Where is HIP 89020 located in the sky?

HIP 89020 lies in the constellation Sagittarius at right ascension 18h 10m and declination -30° 44′.

What telescope do I need to split HIP 89020?

Splitting HIP 89020 requires an aperture of roughly 100 mm or larger — the components are separated by about 4.1″ at magnitudes near 5.5. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 89020 — Double Star in Sagittarius

Observable Double Star Good (55/100)

Sep: 4.1", Companion: mag 8.0

Magnitude 5.5^m DoubleStar Sagittarius (Sgr) Visible

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Observe

1Physical Properties

Magnitude 5.53

Spectral Type K1II bright giant

Star Color Orange (B-V 0.97)

Distance 815 ly

2Position & Identifiers

RA 18h 10m 05.7s

Dec -30° 43' 43.0"

Constellation Sagittarius (Sgr)

HR 6780

HIP 89020

HD 166023

SAO 209803

SIMBAD

3How easy to split?

Primary 5.5 mag Companion 8.0 mag Separation 4.1″

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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

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Best season May – Jul (peak: Jun)

5Multiple Star System

Separation 4.1″

Companion Mag 8.0

Companion Sp F0IV

Position Angle 345°

Star Colors A: Orange B: Yellow-white

Discoverer BU 245

Notes

Binary. Combined mag., colors. Component B is F0IV or F0V.

Separation over time

Measured 1874 → 2016 (142 y)

Separation drift 3.5" → 4.1" (+0.60")

Rate +0.0042" / y

PA drift 355° → 345° (-10°, -0.070°/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.