When is the best time to observe 80 Tauri?

80 Tauri is best observed from October through December, with peak visibility during November when it transits around midnight in the Northern Hemisphere.

Where is 80 Tauri located in the sky?

80 Tauri lies in the constellation Taurus at right ascension 04h 30m and declination +15° 38′.

What telescope do I need to split 80 Tauri?

Splitting 80 Tauri requires an aperture of roughly 210 mm or larger — the components are separated by about 1.4″ at magnitudes near 5.6. Larger apertures and steady seeing help resolve the pair cleanly.

80 Tauri — Double Star in Taurus

Observable Double Star Fair (21/100)

Sep: 1.4", Companion: mag 8.1

Magnitude 5.6^m DoubleStar Taurus (Tau) Visible

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Observe

1Physical Properties

Magnitude 5.58

Spectral Type F0V

Star Color Yellow-white (B-V 0.32)

Distance 105 ly

2Position & Identifiers

RA 04h 30m 08.6s

Dec +15° 38' 17.0"

Constellation Taurus (Tau)

HR 1422

HIP 20995

HD 28485

SAO 93970

Flamsteed 80 Tau

Double Cat 3264

SIMBAD

3How easy to split?

Primary 5.6 mag Companion 8.1 mag Separation 1.4″

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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 210 mm reflector.

4Visibility

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Best season Oct – Dec (peak: Nov)

5Multiple Star System

Separation 1.4″

Companion Mag 8.1

Companion Sp G0V

Position Angle 17°

Star Colors A: Yellow-white B: Yellow

Discoverer STF 554

Notes

5.7 F0V, 7.98 G2V, 189.5y, a = 1.01" (alternates 180.0y, a = 1.00"; 170y, a = 1.029"). Combined mass 2.82 solar. | Speckle interferometric sep. 1.300" (1980.94).