When is the best time to observe 77 Piscium?

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

Where is 77 Piscium located in the sky?

77 Piscium lies in the constellation Pisces at right ascension 01h 06m and declination +04° 55′.

What telescope do I need to split 77 Piscium?

Splitting 77 Piscium requires an aperture of roughly 60 mm or larger — the components are separated by about 33.1″ at magnitudes near 6.3. Larger apertures and steady seeing help resolve the pair cleanly.

77 Piscium — Double Star in Pisces

Magnitude 6.3^m DoubleStar Pisces (Psc) Visible

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Observe

1Physical Properties

Magnitude 6.35

Spectral Type F3V

Star Color Yellow-white (B-V 0.38)

2Position & Identifiers

RA 01h 05m 49.2s

Dec +04° 54' 30.0"

Constellation Pisces (Psc)

HR 313

HIP 5141

HD 6479

SAO 109666

Flamsteed 77 Psc

Double Cat 903

SIMBAD

3How easy to split?

Primary 6.4 mag Companion 7.3 mag Separation 33.1″

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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 Quintuple C,E: optical

Components 5 (quintuple)

Component IDs AB

Separation 33.1″

Companion Mag 7.3

Companion Sp F5V

Position Angle 84°

Star Colors A: Yellow-white B: Yellow-white

Discoverer STF 90

Notes

CPM with HR 314. Faint companions probably optical.

Separation over time

Measured 1782 → 2021 (239 y)

Separation drift 29.6" → 33.1" (+3.50")

Rate +0.0146" / y

PA drift 85° → 84° (-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.