HIP 104978 — Double Star in Indus

Magnitude 5.8^m DoubleStar Indus (Ind) Visible

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Observe

1Physical Properties

Magnitude 5.75

Spectral Type A6IV subgiant

Star Color Yellow-white (B-V 0.19)

2Position & Identifiers

RA 21h 15m 45.9s

Dec -53° 15' 47.0"

Constellation Indus (Ind)

HR 8114

HIP 104978

HD 202103

SAO 246929

3How easy to spot?

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Equipment	Bortle 3	Bortle 4	Bortle 5
Naked eye Naked eye	Hard+	Hard	V. hard+
50 mm finder 50mm finder	Easy	Easy	Easy
150 mm telescope 150mm scope	Easy	Easy	Easy

Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Jul – Sep (peak: Aug)

5Multiple Star System

Separation 0.2″

Companion Mag 6.8

Position Angle 81°

Star Colors A: Yellow-white B: Yellow-white

Discoverer FIN 329

Notes

6.5 A7V, 6.5 A7V, 17y, a = 0.11". Combined mag., color.

Separation over time

Period: 36.9 y Eccentricity: 0.054 Now: 0.17", PA 72° -0.08" in 5 years

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

Explore

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Size Comparison

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Compare Stars

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Spectral Classification

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Hertzsprung-Russell Diagram

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

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Stellar Lifecycle

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Blackbody Spectrum

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Stellar Absorption Spectrum

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

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Stellar Fusion

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.

Easy double, sep 7.3″

Double Star mag 4.39 0.6° Indus

Elliptical galaxy

Galaxy mag 13.0 1.7° Indus

Semi-regular variable, range 5.8–6.5

Variable Star mag 6.00 8.3° Indus

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