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25 Canum Venaticorum — Double Star in Canes Venatici

Observable Double Star Fair (24/100)

Sep: 1.7", Companion: mag 7.0

Magnitude 4.8m DoubleStar Canes Venatici (CVn) Visible
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1Physical Properties

Magnitude 4.82
Spectral Type A7III giant
Star Color Yellow-white (B-V 0.23)
Distance 109 ly

2Position & Identifiers

RA 13h 37m 27.6s
Dec +36° 17' 42.0"
Constellation Canes Venatici (CVn)
HR 5127
HIP 66458
HD 118623
SAO 63648
Flamsteed 25 CVn
Double Cat 8974
SIMBAD

3How easy to split?

Primary 4.8 mag Companion 7.0 mag Separation 1.7″
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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Hard Hard Hard
150mm Newt. Medium Medium Medium
C8 203mm Medium+ Medium+ Medium+
Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Mar – May (peak: Apr)

5Multiple Star System Triple C,D,E,F: optical

Components 3 (triple)
Component IDs AB
Separation 1.7″
Companion Mag 7.0
Companion Sp A8V
Position Angle 94°
Star Colors A: Yellow-white B: Yellow-white
Discoverer STF1768
AB 5.01 A7III, 6.91 F0V, 240.0y, a = 1.091" or 220.4y, a = 1.205". Combined mag., colors.

Separation over time

Period: 245.0 y Eccentricity: 0.833 Now: 1.7", PA 93° -0.03" in 5 years
0.00" 0.50" 0.99" 1.5" 2.0" 2025 2030 2035 2040 2045 1.7"

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 94°

A: 4.8 · B: 7.0 · Sep: 1.7″ · PA: 94° · N up, E right

Unresolved · 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

0.017".
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.

NGC 5005
Easy
Bright spiral galaxy
Galaxy mag 9.8 5.4° Canes Venatici
17 CVn
Easy
Easy double, sep 275.6″
Double Star mag 5.91 5.9° Canes Venatici
Alpha2 CVn
COR CAROLI
Easy
Easy double, sep 19.2″
Double Star mag 2.90 8.5° Canes Venatici
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