Gamma Delphini — Double Star in Delphinus

HIP 102532; Gamma2 Delphini; 12 Delphini

Observable Double Star Excellent (74/100)

Sep: 8.8", Companion: mag 5.0

Magnitude 4.3^m DoubleStar Delphinus (Del) Visible

Star Map + List + Plan

Observe

1Physical Properties

Magnitude 4.27

Spectral Type K1IV subgiant

Star Color Orange (B-V 1.04)

Distance 125 ly

2Position & Identifiers

RA 20h 46m 39.5s

Dec +16° 07' 27.0"

Constellation Delphinus (Del)

HR 7948

HIP 102532

HD 197964

SAO 106476

Bayer Gamma2

Flamsteed 12 Del

Double Cat 14279

SIMBAD Wikipedia

3How easy to split?

Primary 4.3 mag Companion 5.0 mag Separation 8.8″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Easy	Easy	Easy
150 mm Newton 150mm Newt.	Easy	Easy	Easy
Celestron C8 (203 mm SCT) C8 203mm	Easy	Easy	Easy

Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Jun – Aug (peak: Jul)

5Multiple Star System D: optical

Separation 8.8″

Companion Mag 5.0

Companion Sp F7V

Position Angle 266°

Star Colors A: Orange B: Yellow

Discoverer STF2727

Notes

See HR 7947.

Separation over time

Period: 3249.0 y Eccentricity: 0.880 Now: 8.7", PA 264° -0.10" 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: 4.3 · B: 5.0 · Sep: 8.8″ · PA: 266° · N up, E right

Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″

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7

Size Comparison

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9

Spectral Classification

10

Hertzsprung-Russell Diagram

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11

Stellar Lifecycle

12

Blackbody Spectrum

13

Stellar Absorption Spectrum

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

14

Stellar Fusion

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15Stellar Notes

Group/Cluster

Wolf 630 group.

Dynamical

0.033".

16

Light Travel Time Machine

17

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.

HIP 102531; Gamma1 Delphini; 12 Delphini

Colorful double, sep 9.8″

Double Star mag 5.14 0.0° Delphinus

Semi-regular variable, range 6.1–7.6

Variable Star mag 6.38 2.0° Delphinus

Globular cluster — dense ball of ancient stars

Globular Cluster mag 10.6 3.6° Delphinus

Easy double, sep 214.6″

Double Star mag 5.05 6.3° Delphinus

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