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Epsilon² Lyrae — Double Star in Lyra

Observable Double Star Excellent (65/100)

Sep: 2.4", Companion: mag 5.5

Magnitude 5.1m DoubleStar Lyra (Lyr) Visible
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1Physical Properties

Magnitude 5.14
Spectral Type A8Vn
Star Color Yellow-white (B-V 0.19)
Distance 155 ly

2Position & Identifiers

RA 18h 44m 22.9s
Dec +39° 36' 47.0"
Constellation Lyra (Lyr)
HR 7053
HIP 91926
HD 173607
SAO 67315
Bayer Epsilon2
Flamsteed 5 Lyr
Double Cat 11635
SIMBAD

3How easy to split?

Primary 5.1 mag Companion 5.5 mag Separation 2.4″
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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Hard+ Hard+ Hard+
150mm Newt. Easy Easy Easy
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 May – Jul (peak: Jun)

5Multiple Star System 10 components

Components 10
Component IDs CD
Separation 2.4″
Companion Mag 5.5
Companion Sp A5
Position Angle 79°
Star Colors A: Yellow-white D: Yellow-white
Discoverer STF2383
CD 5.23 A3n, 5.47 A5, 585y, a = 2.95". Component C is speckle binary, sep. 0.184".

Separation over time

Period: 724.3 y Eccentricity: 0.353 Now: 2.4", PA 72° + 0.02" in 5 years
0.00" 0.71" 1.4" 2.1" 2.9" 2025 2030 2035 2040 2045 2.4"

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

Eyepiece View

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80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 79°

A: 5.1 · B: 5.5 · Sep: 2.4″ · PA: 79° · N up, E right

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

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6

Size Comparison

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7

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8

Spectral Classification

9

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
10

Stellar Lifecycle

11

Blackbody Spectrum

12

Stellar Absorption Spectrum

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

13

Stellar Fusion

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14Stellar Notes

Uncertain whether 7053 or 7054 is variable suspect NSV 11301.
Hyades group.
0.025".
See HR 7051.
15

Light Travel Time Machine

16

Relativistic Travel

Nearby in the Sky

Other targets within a few degrees — pan your scope a little and keep exploring.

Visibility scores assume a 150 mm Newton at Bortle 4.

Epsilon¹ Lyr
Medium+
Tight double — a rewarding split at 2.2″
Double Star mag 5.06 0.1° Lyra
XY Lyr
Medium
Semi-regular variable, range 5.8–6.3
Variable Star mag 6.04 1.2° Lyra
Vega
HIP 91262; Alpha Lyrae; 3 Lyrae
Easy
Bright naked-eye star, mag 0.0
Star mag 0.03 1.7° Lyra
Zeta Lyr
HIP 91971; Zeta1 Lyrae; 6 Lyrae
Easy
Easy double, sep 43.9″
Double Star mag 4.36 2.0° Lyra
Delta Lyr
HIP 92791; Delta2 Lyrae; 12 Lyrae
Medium
Cool red giant
Double Star mag 4.30 3.4° Lyra
NGC 6703
Medium+
Elliptical galaxy
Galaxy mag 11.4 6.0° Lyra
M57
NGC 6720
Easy
Planetary nebula — try an OIII filter
Planetary Nebula mag 9.0 6.8° Lyra
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