When is the best time to observe 63 Geminorum?

63 Geminorum is best observed from December through February, with peak visibility during January when it transits around midnight in the Northern Hemisphere.

Where is 63 Geminorum located in the sky?

63 Geminorum lies in the constellation Gemini at right ascension 07h 28m and declination +21° 27′.

What telescope do I need to split 63 Geminorum?

Splitting 63 Geminorum requires an aperture of roughly 60 mm or larger — the components are separated by about 42.7″ at magnitudes near 5.2. The companion is about 5.7 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

63 Geminorum — Double Star in Gemini

Magnitude 5.2^m DoubleStar Gemini (Gem) Visible

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Observe

1Physical Properties

Magnitude 5.22

Spectral Type F5V+F5V

Star Color Yellow-white (B-V 0.39)

Distance 80 ly

2Position & Identifiers

RA 07h 27m 44.4s

Dec +21° 26' 42.0"

Constellation Gemini (Gem)

HR 2846

HIP 36238

HD 58728

SAO 79403

Flamsteed 63 Gem

Double Cat 6089

SIMBAD

3How easy to split?

Primary 5.2 mag Companion 10.9 mag Separation 42.7″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Hard+	Hard	Hard
150 mm Newton 150mm Newt.	Medium+	Medium+	Medium
Celestron C8 (203 mm SCT) C8 203mm	Easy	Medium+	Medium+

Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Dec – Feb (peak: Jan)

5Multiple Star System Quintuple C: optical

Components 5 (quintuple)

Component IDs O

Separation 42.7″

Companion Mag 10.9

Companion Sp F5V

Position Angle 324°

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

Discoverer SHJ 368

Notes

A is occultation triple, 5.9, 6.4v sep. 0.001" and 7.5v at 0.047". Visual companions B, 9.5v at 43" CPM; C, 10.5v at | 146".

Separation over time

Measured 1831 → 2017 (186 y)

Separation drift 50.0" → 42.7" (-7.30")

Rate -0.0392" / y

PA drift 325° → 324° (-1°, -0.005°/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.