When is the best time to observe 59 Andromedae?

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

Where is 59 Andromedae located in the sky?

59 Andromedae lies in the constellation Andromeda at right ascension 02h 11m and declination +39° 02′.

What telescope do I need to split 59 Andromedae?

Splitting 59 Andromedae requires an aperture of roughly 60 mm or larger — the components are separated by about 16.6″ at magnitudes near 5.6. Larger apertures and steady seeing help resolve the pair cleanly.

59 Andromedae — Double Star in Andromeda

Observable Double Star Excellent (61/100)

Sep: 16.6", Companion: mag 6.7

Magnitude 5.6^m DoubleStar Andromeda (And) Visible

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Observe

1Physical Properties

Magnitude 5.63

Spectral Type B9V

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

Distance 326 ly

2Position & Identifiers

RA 02h 10m 52.8s

Dec +39° 02' 22.0"

Constellation Andromeda (And)

HR 628

HIP 10176

HD 13294

SAO 55330

Flamsteed 59 And

Double Cat 1683

SIMBAD

3How easy to split?

Primary 5.6 mag Companion 6.7 mag Separation 16.6″

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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 Sep – Nov (peak: Oct)

5Multiple Star System

Separation 16.6″

Companion Mag 6.7

Companion Sp A1Vn

Position Angle 36°

Star Colors A: Blue-white B: White

Discoverer STF 222

Notes

CPM with HR 629.

Separation over time

Measured 1783 → 2019 (236 y)

Separation drift 15.3" → 16.6" (+1.30")

Rate +0.0055" / y

PA drift 35° → 36° (+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.