When is the best time to observe Pi Andromedae?

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

Where is Pi Andromedae located in the sky?

Pi Andromedae lies in the constellation Andromeda at right ascension 00h 37m and declination +33° 43′.

What telescope do I need to split Pi Andromedae?

Splitting Pi Andromedae requires an aperture of roughly 60 mm or larger — the components are separated by about 36.2″ at magnitudes near 4.4. Larger apertures and steady seeing help resolve the pair cleanly.

Pi Andromedae — Double Star in Andromeda

Observable Double Star Excellent (69/100)

Sep: 36.2", Companion: mag 7.1

Magnitude 4.4^m DoubleStar Andromeda (And) Visible

Star Map + List + Plan

Observe

1Physical Properties

Magnitude 4.36

Spectral Type B5V

Star Color Blue (B-V -0.14)

2Position & Identifiers

RA 00h 36m 52.9s

Dec +33° 43' 10.0"

Constellation Andromeda (And)

HR 154

HIP 2912

HD 3369

SAO 54033

Bayer Pi

Flamsteed 29 And

Double Cat 513

SIMBAD

3How easy to split?

Primary 4.4 mag Companion 7.1 mag Separation 36.2″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Easy	Easy	Easy
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 Aug – Oct (peak: Sep)

5Multiple Star System Triple

Components 3 (triple)

Component IDs AB

Separation 36.2″

Companion Mag 7.1

Companion Sp K6V

Position Angle 174°

Star Colors A: Blue B: Red

Discoverer H 5 17

Notes

AB 103000?y. Component B spectrum A6V or Am(A3/F0/F2), RV +11.9k/s. Component C, 11.4v, F3 at 55" optical.

Separation over time

Measured 1821 → 2020 (199 y)

Separation drift 35.8" → 36.2" (+0.40")

Rate +0.0020" / y

PA drift 175° → 174° (-1°, -0.005°/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.