When is the best time to observe 30 Pegasi?

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

Where is 30 Pegasi located in the sky?

30 Pegasi lies in the constellation Pegasus at right ascension 22h 20m and declination +05° 47′.

What telescope do I need to split 30 Pegasi?

Splitting 30 Pegasi requires an aperture of roughly 60 mm or larger — the components are separated by about 18.0″ at magnitudes near 5.4. The companion is about 6.0 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

30 Pegasi — Double Star in Pegasus

Magnitude 5.4^m DoubleStar Pegasus (Peg) Visible

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Observe

1Physical Properties

Magnitude 5.37

Spectral Type B5IV subgiant

Star Color Blue-white (B-V -0.02)

2Position & Identifiers

RA 22h 20m 27.6s

Dec +05° 47' 22.0"

Constellation Pegasus (Peg)

HR 8513

HIP 110298

HD 211924

SAO 127453

Flamsteed 30 Peg

Double Cat 15847

SIMBAD

3How easy to split?

Primary 5.4 mag Companion 11.3 mag Separation 18.0″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Hard+	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 Jul – Sep (peak: Aug)

5Multiple Star System Triple

Components 3 (triple)

Component IDs AC

Separation 18.0″

Companion Mag 11.3

Position Angle 228°

Star Colors A: Blue-white

Discoverer HJ 962

Notes

AB CPM. B, 10.7v A7V at 6"; C, F6IV, optical.

Separation over time

Measured 1827 → 2013 (186 y)

Separation drift 5.5" → 18.0" (+12.50")

Rate +0.0672" / y

PA drift 210° → 228° (+18°, +0.097°/y)

Apparent motion is significant on a human timescale — worth revisiting in a decade.

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.