HIP 23166 — Double Star in Lepus

Magnitude 5.7^m DoubleStar Lepus (Lep) Visible

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Observe

1Physical Properties

Magnitude 5.66

Spectral Type F3V+F9V

Star Color Yellow-white (B-V 0.43)

Distance 116 ly

2Position & Identifiers

RA 04h 59m 01.3s

Dec -16° 22' 33.0"

Constellation Lepus (Lep)

HR 1604

HIP 23166

HD 31925

SAO 150052

Double Cat 3588

3How easy to split?

Primary 5.7 mag Companion 7.5 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	V. hard+	V. hard+	V. 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 400 mm reflector.

4Visibility

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Best season Oct – Dec (peak: Nov)

5Multiple Star System Triple

Components 3 (triple)

Component IDs AB

Separation 0.6″

Companion Mag 7.5

Companion Sp F9V

Position Angle 315°

Star Colors A: Yellow-white B: Yellow

Discoverer BU 314

Notes

AB 5.94 F3V, 7.28 F9V, 54.62y, a = 0.507". Component C, 8v at 54", optical.

Separation over time

Period: 55.0 y Eccentricity: 0.927 Now: 0.56", PA 313° -0.28" 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: 7.5 · Sep: 0.6″ · PA: 315° · 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

Dynamical

0.027".

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.

Mira-type variable, range 5.5–11.7

Variable Star mag 7.71 1.6° Lepus

Bright spiral galaxy

Galaxy mag 12.87 2.8° Lepus

Tight double — a rewarding split at 2.0″

Double Star mag 4.36 4.9° Lepus

Double Star mag 4.32 5.5° Eridanus

Colorful double, sep 297.9″

Double Star mag 5.38 6.1° Eridanus

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