When is the best time to observe 1 Delphini?

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

Where is 1 Delphini located in the sky?

1 Delphini lies in the constellation Delphinus at right ascension 20h 30m and declination +10° 54′.

What telescope do I need to split 1 Delphini?

Splitting 1 Delphini requires an aperture of roughly 250 mm or larger — the components are separated by about 0.9″ at magnitudes near 6.1. Larger apertures and steady seeing help resolve the pair cleanly.

1 Delphini — Double Star in Delphinus

Magnitude 6.1^m DoubleStar Delphinus (Del) Visible

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Observe

1Physical Properties

Magnitude 6.08

Spectral Type A1eShell

Star Color White (B-V -0.03)

2Position & Identifiers

RA 20h 30m 18.0s

Dec +10° 53' 45.0"

Constellation Delphinus (Del)

HR 7836

HIP 101160

HD 195325

SAO 106172

Flamsteed 1 Del

Double Cat 13920

SIMBAD

3How easy to split?

Primary 6.1 mag Companion 8.0 mag Separation 0.9″

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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	Hard+	Hard+	Hard+

Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

To reach "Medium" at Bortle 3, you'd need at least a 250 mm reflector.

4Visibility

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Best season Jun – Aug (peak: Jul)

5Multiple Star System Triple

Components 3 (triple)

Component IDs AB

Separation 0.9″

Companion Mag 8.0

Companion Sp B

Position Angle 350°

Star Colors A: White B: Blue

Discoverer BU 63

Notes

AB binary.

Separation over time

Measured 1872 → 2020 (148 y)

Separation drift 0.70" → 0.90" (+0.20")

Rate +0.0014" / y

PA drift 340° → 350° (+10°, +0.068°/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.