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HIP 88726 — Double Star in Corona Australis

Observable Double Star Fair (30/100)

Sep: 1.8", Companion: mag 5.7

Magnitude 5.8m DoubleStar Corona Australis (CrA) Visible
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1Physical Properties

Magnitude 5.77
Spectral Type A5V
Star Color Yellow-white (B-V 0.22)
Distance 155 ly

2Position & Identifiers

RA 18h 06m 49.8s
Dec -43° 25' 29.0"
Constellation Corona Australis (CrA)
HR 6749
HIP 88726
HD 165189
SAO 228708
SIMBAD

3How easy to split?

Primary 5.8 mag Companion 5.7 mag Separation 1.8″
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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 May – Jul (peak: Jun)

5Multiple Star System

Separation 1.8″
Companion Mag 5.7
Companion Sp A5V
Position Angle 359°
Star Colors A: Yellow-white B: Yellow-white
Discoverer HJ 5014
AB 5.7 A5V, 5.7 A5V, 191.23y, a = 1.063". Component B is HR 6750. Color for combined light. Combined mag. 4.95V.

Separation over time

Period: 450.0 y Eccentricity: 0.650 Now: 1.8", PA 355° + 0.02" in 5 years
0.00" 0.53" 1.1" 1.6" 2.1" 2025 2030 2035 2040 2045 1.8"

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

A: 5.8 · B: 5.7 · Sep: 1.8″ · PA: 359° · 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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Spectral Classification

9

Hertzsprung-Russell Diagram

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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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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.

C78
NGC 6541
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 6.6 0.4° Corona Australis
Sargas
HIP 86228; Theta Scorpii
Easy
Easy double, sep 6.5″
Double Star mag 1.87 5.4° Scorpius
Kappa CrA
HIP 90968; Kappa2 Coronae Australis
Easy
Easy double, sep 20.5″
Double Star mag 5.65 6.9° Corona Australis
NGC 6400
Easy
Open cluster
Open Cluster mag 9.0 8.2° Scorpius
RS Sgr
Medium+
Eclipsing binary, period 2.4d
Variable Star mag 6.16 9.5° Sagittarius
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