4 Lyncis — Double Star in Lynx

Magnitude 5.9^m DoubleStar Lynx (Lyn) Visible

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Observe

1Physical Properties

Magnitude 5.94

Spectral Type A3V

Distance 652 ly

2Position & Identifiers

RA 06h 22m 03.6s

Dec +59° 22' 20.0"

Constellation Lynx (Lyn)

HR 2257

HIP 30272

HD 43812

SAO 25678

Flamsteed 4 Lyn

Double Cat 4950

3How easy to split?

Primary 5.9 mag Companion 7.7 mag Separation 0.6″

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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.	V. hard+	V. hard+	V. 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 370 mm reflector.

4Visibility

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Best season Nov – Jan (peak: Dec)

5Multiple Star System Quintuple D: optical

Components 5 (quintuple)

Component IDs AB

Separation 0.6″

Companion Mag 7.7

Position Angle 154°

Discoverer STF 881

Notes

AB binary. C, 12.9v at 26". D, 11.0 at 100". AE magnitude difference 6.24V, sep. 70".

Separation over time

Period: 503.0 y Eccentricity: 0.518 Now: 0.61", PA 154° -0.01" 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: 5.9 · B: 7.7 · Sep: 0.6″ · PA: 154° · 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

Compare Stars

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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

Discover

14

Light Travel Time Machine

15

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.

Pulsating variable, period 7.2h

Variable Star mag 4.48 0.5° Lynx

Elliptical galaxy

Galaxy mag 13.0 2.9° Camelopardalis

Tight double — a rewarding split at 1.9″

Double Star mag 4.87 3.1° Lynx

Easy double, sep 13.8″

Double Star mag 5.45 9.1° Lynx

Open Cluster mag 10.0 9.9° Auriga

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