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115 Tau

HIP 25499; 115 Tau DoubleStar Tau Visible Level 3 Medium telescope (6-8") - Requires steady seeing
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Physical Properties

Magnitude 5.42
Spectral Type B5V
Star Color Blue-white (B-V -0.10)

Position & Identifiers

RA 05h 27m 10.1s
Dec +17° 57' 44.0"
Constellation Tau
HR 1808
HIP 25499
Flamsteed 115 Tau
Double Cat 4038

Visibility

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Multiple Star System

Components 4
Component IDs O
Separation 10.1″
Companion Mag 11.1
Companion Sp F8V
Position Angle 307°
Star Colors A: Blue-white B: Yellow
Discoverer STT 107

Eyepiece View

80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 307° A (5.4) B (11.1)

Sep: 10.1″ · PA: 307° · N up, E left

Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″

Size Comparison

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Stellar Lifecycle

Spectral Classification

Hertzsprung-Russell Diagram

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Blackbody Spectrum

Stellar Absorption Spectrum

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

Stellar Fusion

Stellar Notes

ADS 4038A is occultation double. B and C are 10.1v at 305" and 11.8v at 343".
Member of the local association (Pleiades group); Cas-Tau OB1.

Survey Image

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