When is the best time to observe HIP 97787?

HIP 97787 is best observed from June through August, with peak visibility during July when it transits around midnight in the Northern Hemisphere.

Where is HIP 97787 located in the sky?

HIP 97787 lies in the constellation Aquila at right ascension 19h 52m and declination +10° 21′.

What telescope do I need to split HIP 97787?

Splitting HIP 97787 requires an aperture of roughly 60 mm or larger — the components are separated by about 13.6″ at magnitudes near 6.5. The companion is about 3.8 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 97787 — Double Star in Aquila

Magnitude 6.5^m DoubleStar Aquila (Aql) Visible

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Observe

1Physical Properties

Magnitude 6.54

Range 6.50 - 6.59

Variable Type BE

Spectral Type B7V

Star Color Blue-white (B-V -0.01)

2Position & Identifiers

RA 19h 52m 15.6s

Dec +10° 21' 05.0"

Constellation Aquila (Aql)

HR 7572

HIP 97787

HD 187961

SAO 105355

Double Cat 13041

SIMBAD

3How easy to split?

Primary 6.5 mag Companion 10.3 mag Separation 13.6″

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

Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Jun – Aug (peak: Jul)

5Multiple Star System Quadruple C: optical

Components 4 (quadruple)

Component IDs AB

Separation 13.6″

Companion Mag 10.3

Companion Sp A3V

Position Angle 308°

Star Colors A: Blue-white B: Yellow

Discoverer STF2590

Notes

Component B = A3V.

Separation over time

Measured 1781 → 2017 (236 y)

Separation drift 12.0" → 13.6" (+1.60")

Rate +0.0068" / y

PA drift 307° → 308° (+1°, +0.004°/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.