When is the best time to observe V711 Tauri?

V711 Tauri is best observed from October through December, with peak visibility during November when it transits around midnight in the Northern Hemisphere.

Where is V711 Tauri located in the sky?

V711 Tauri lies in the constellation Taurus at right ascension 03h 37m and declination +00° 35′.

What telescope do I need to split V711 Tauri?

Splitting V711 Tauri requires an aperture of roughly 80 mm or larger — the components are separated by about 6.7″ at magnitudes near 5.7. The companion is about 3.2 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

V711 Tauri — Double Star in Taurus

Observable Double Star Good (54/100)

Sep: 6.7", Companion: mag 8.9

Magnitude 5.7–5.8^m DoubleStar Taurus (Tau) Visible

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Observe

1Physical Properties

Magnitude 5.71

Range 5.71 - 5.94

Period 2.8 days

Variable Type RS CVn (Chromospherically Active)

Spectral Type G9V

Star Color Orange (B-V 0.92)

Distance 102 ly

2Position & Identifiers

RA 03h 36m 47.3s

Dec +00° 35' 16.0"

Constellation Taurus (Tau)

HR 1099

HIP 16846

HD 22468

SAO 111291

Variable ID V711 Tau

Double Cat 2644

SIMBAD

3How easy to split?

Primary 5.7 mag Companion 8.9 mag Separation 6.7″

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

Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Oct – Dec (peak: Nov)

5Light Curve

6Multiple Star System

Separation 6.7″

Companion Mag 8.9

Companion Sp K6

Position Angle 273°

Star Colors A: Orange B: Red

Discoverer STF 422

Notes

5.88 dG9, 8.83, B-V +0.99, U-B +0.79, K6V, 2101y, a = 8.023". Close radio binary.

Separation over time

Period: 1210.1 y Eccentricity: 0.728 Now: 6.7", PA 275° + 0.02" in 5 years

Apparent separation over time, computed from ORB6 orbital elements. Steep curves indicate fast-changing pairs — catch them while they're splittable.

Eyepiece View

Telescope Eyepiece

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80x Dawes: 1.9″ TFOV: 0.6°

Seeing

Scale Realistic = true angular size

A: 5.7 · B: 8.9 · Sep: 6.7″ · PA: 273° · N up, E right

Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″

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Size Comparison

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Spectral Classification

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Hertzsprung-Russell Diagram

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Stellar Lifecycle

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Blackbody Spectrum

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Stellar Absorption Spectrum

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

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Stellar Fusion

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15Stellar Notes

Variable Star

RS 5.70 - 5.81V, 2.83782d. Min. migrate in period 13y. Brightest of 25 RS CVn binaries known in 1976. Also var. radio | emission. Radio flare star with variable polarization. Amp. in red light (6600 A) 0.11 mag. Star spots inferred to | be about 1100d cooler than surrounding photosphere.

Spectroscopic Binary

ADS 2644A, 2.8378d, K 50.2k/s, V0 -14.0k/s, msin3i 0.227, asini 1.96.

Dynamical

0.055".

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