When is the best time to observe 75 Pegasi?

75 Pegasi is best observed from August through October, with peak visibility during September when it transits around midnight in the Northern Hemisphere.

Where is 75 Pegasi located in the sky?

75 Pegasi lies in the constellation Pegasus at right ascension 23h 38m and declination +18° 24′.

What telescope do I need to split 75 Pegasi?

Splitting 75 Pegasi requires an aperture of roughly 60 mm or larger — the components are separated by about 27.5″ at magnitudes near 5.5. The companion is about 6.1 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

75 Pegasi — Double Star in Pegasus

Magnitude 5.5^m DoubleStar Pegasus (Peg) Visible

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Observe

1Physical Properties

Magnitude 5.53

Variable Type Ellipsoidal Variable

Spectral Type A1Vn

Star Color White (B-V 0.00)

2Position & Identifiers

RA 23h 37m 56.8s

Dec +18° 24' 02.0"

Constellation Pegasus (Peg)

HR 8963

HIP 116611

HD 222133

SAO 108732

Flamsteed 75 Peg

Variable ID KS Peg

SIMBAD

3How easy to split?

Primary 5.5 mag Companion 11.6 mag Separation 27.5″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Hard	V. hard+	V. hard
150 mm Newton 150mm Newt.	Medium	Medium	Hard+
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 Aug – Oct (peak: Sep)

5Multiple Star System

Separation 27.5″

Companion Mag 11.6

Position Angle 245°

Star Colors A: White

Discoverer KUI 117

Separation over time

Measured 1958 → 2011 (53 y)

Separation drift 27.6" → 27.5" (-0.10")

Rate -0.0019" / y

PA drift 246° → 245° (-1°, -0.019°/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.