When is the best time to observe 37 Ceti?

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

Where is 37 Ceti located in the sky?

37 Ceti lies in the constellation Cetus at right ascension 01h 14m and declination -07° 55′.

What telescope do I need to split 37 Ceti?

Splitting 37 Ceti requires an aperture of roughly 60 mm or larger — the components are separated by about 49.0″ at magnitudes near 5.1. Larger apertures and steady seeing help resolve the pair cleanly.

37 Ceti — Double Star in Cetus

Observable Double Star Good (57/100)

Sep: 49.0", Companion: mag 7.8

Magnitude 5.1^m DoubleStar Cetus (Cet) Visible

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Observe

1Physical Properties

Magnitude 5.13

Spectral Type F5V

Star Color Yellow-white (B-V 0.46)

Distance 58 ly

2Position & Identifiers

RA 01h 14m 24.0s

Dec -07° 55' 23.0"

Constellation Cetus (Cet)

HR 366

HIP 5799

HD 7439

SAO 129193

Flamsteed 37 Cet

Double Cat 1003

SIMBAD

3How easy to split?

Primary 5.1 mag Companion 7.9 mag Separation 49.0″

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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 49.0″

Companion Mag 7.8

Companion Sp G9V

Position Angle 331°

Star Colors A: Yellow-white B: Orange

Discoverer STFA 3

Notes

CPM. Component B, G7V.

Separation over time

Measured 1800 → 2024 (224 y)

Separation drift 48.0" → 49.0" (+1.00")

Rate +0.0045" / y

PA drift 332° → 331° (-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.