Kappa Sculptoris — Double Star in Sculptor

HIP 761; Kappa1 Sculptoris

Observable Double Star Fair (29/100)

Sep: 1.3", Companion: mag 6.2

Magnitude 5.4^m DoubleStar Sculptor (Scl) Visible

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Observe

1Physical Properties

Magnitude 5.42

Spectral Type F2V

Star Color Yellow-white (B-V 0.42)

Distance 142 ly

2Position & Identifiers

RA 00h 09m 21.0s

Dec -27° 59' 16.0"

Constellation Sculptor (Scl)

HR 24

HIP 761

HD 493

SAO 166083

Bayer Kappa1

Double Cat 111

SIMBAD Wikipedia

3How easy to split?

Primary 5.4 mag Companion 6.2 mag Separation 1.3″

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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.	Hard+	Hard+	Hard+
Celestron C8 (203 mm SCT) 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 Aug – Oct (peak: Sep)

5Multiple Star System Triple C: optical

Components 3 (triple)

Component IDs AB

Separation 1.3″

Companion Mag 6.2

Position Angle 258°

Star Colors A: Yellow-white B: Yellow

Discoverer BU 391

Notes

Primary F4III, comp. B, F3III.

Separation over time

Period: 575.7 y Eccentricity: 0.502 Now: 1.3", PA 257° -0.05" 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

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80x Dawes: 1.9″ TFOV: 0.6°

Seeing

Scale Realistic = true angular size

A: 5.4 · B: 6.2 · Sep: 1.3″ · PA: 258° · 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

Discover

14Stellar Notes

Dynamical

0.011".

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.

Bright spiral galaxy

Galaxy mag 11.5 3.0° Sculptor

Semi-regular variable, range 5.0–6.9

Variable Star mag 5.12 8.4° Cetus

Globular cluster — dense ball of ancient stars

Globular Cluster mag 8.1 9.8° Sculptor

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