When is the best time to observe 13 Delphini?

13 Delphini is best observed from June through August, with peak visibility during July when it transits around midnight in the Northern Hemisphere.

Where is 13 Delphini located in the sky?

13 Delphini lies in the constellation Delphinus at right ascension 20h 48m and declination +06° 01′.

What telescope do I need to split 13 Delphini?

Splitting 13 Delphini requires an aperture of roughly 150 mm or larger — the components are separated by about 1.5″ at magnitudes near 5.6. Larger apertures and steady seeing help resolve the pair cleanly.

13 Delphini — Double Star in Delphinus

Observable Double Star Fair (25/100)

Sep: 1.5", Companion: mag 8.2

Magnitude 5.6^m DoubleStar Delphinus (Del) Visible

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Observe

1Physical Properties

Magnitude 5.58

Spectral Type A0V

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

Distance 1,631 ly

2Position & Identifiers

RA 20h 47m 48.3s

Dec +06° 00' 30.0"

Constellation Delphinus (Del)

HR 7953

HIP 102633

HD 198069

SAO 126222

Flamsteed 13 Del

Double Cat 14293

SIMBAD

3How easy to split?

Primary 5.6 mag Companion 8.2 mag Separation 1.5″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	V. hard+	V. hard+	V. hard+
150 mm Newton 150mm Newt.	Hard+	Hard+	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 Jun – Aug (peak: Jul)

5Multiple Star System

Separation 1.5″

Companion Mag 8.2

Position Angle 200°

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

Discoverer BU 65

Separation over time

Measured 1871 → 2016 (145 y)

Separation drift 1.3" → 1.5" (+0.20")

Rate +0.0014" / y

PA drift 195° → 200° (+5°, +0.034°/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.