When is the best time to observe HIP 101213?

HIP 101213 is best observed from June through August, with peak visibility during July when it transits around midnight in the Northern Hemisphere.

Where is HIP 101213 located in the sky?

HIP 101213 lies in the constellation Delphinus at right ascension 20h 31m and declination +20° 36′.

What telescope do I need to split HIP 101213?

Splitting HIP 101213 requires an aperture of roughly 80 mm or larger — the components are separated by about 5.7″ at magnitudes near 6.2. The companion is about 5.8 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 101213 — Double Star in Delphinus

Magnitude 6.2^m DoubleStar Delphinus (Del) Visible

Star Map + List + Plan Star Hop

Observe

1Physical Properties

Magnitude 6.18

Spectral Type A1m

Star Color White (B-V 0.15)

2Position & Identifiers

RA 20h 30m 58.1s

Dec +20° 36' 21.0"

Constellation Delphinus (Del)

HR 7839

HIP 101213

HD 195479

SAO 88783

SIMBAD

3How easy to split?

Primary 6.2 mag Companion 12.0 mag Separation 5.7″

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	Hard+

Easy Medium Hard Very hard Impossible

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

4Visibility

Set a location in User Settings to see visibility data.

Best season Jun – Aug (peak: Jul)

5Multiple Star System Triple C: optical

Components 3 (triple)

Component IDs AB

Separation 5.7″

Companion Mag 12.0

Position Angle 88°

Star Colors A: White

Discoverer BU 363

Separation over time

Measured 1874 → 2015 (141 y)

Separation drift 20.0" → 5.7" (-14.30")

Rate -0.1014" / y

PA drift 60° → 88° (+28°, +0.199°/y)

Apparent motion is significant on a human timescale — worth revisiting in a decade.

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.