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Gamma Velorum — Double Star in Vela

HIP 39953; Gamma1 Velorum

Observable Double Star Good (52/100)

Sep: 60.9", Companion: mag 7.3

DoubleStar Vela (Vel) Visible
Star Map
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Observe

1Physical Properties

Magnitude 4.27
Spectral Type B1IV
Star Color Blue (B-V -0.23)

2Position & Identifiers

RA 08h 09m 29.3s
Dec -47° 20' 45.0"
Constellation Vela (Vel)
HR 3206
HIP 39953
HD 68273
Bayer Gamma1

3How easy to split?

Primary 4.3 mag Companion 7.3 mag Separation 60.9″
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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Easy Easy Easy
150mm Newt. Easy Easy Easy
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 Dec – Feb (peak: Jan)

5Multiple Star System Quintuple

Components 5 (quintuple)
Component IDs AB
Separation 60.9″
Companion Mag 7.3
Companion Sp O9I
Position Angle 113°
Star Colors A: Blue B: Blue
Discoverer DUN 65
Component B of 5 stars within 2' of HR 3207.

Separation over time

Measured 1846 → 2015 (169 y)
Separation drift 61.5" → 60.9" (-0.60")
Rate -0.0036" / y
PA drift 112° → 113° (+1°, +0.006°/y)

Slow change over generations — observable in lifetime comparisons.

Measured from the WDS observational archive. No orbital solution has been derived — most likely the period is too long to fit an orbit to the available measurement arc.

Eyepiece View

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80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 113°

A: 4.3 · B: 7.3 · Sep: 60.9″ · PA: 113° · N up, E left

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

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7

Size Comparison

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Spectral Classification

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Hertzsprung-Russell Diagram

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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

1.482575d, K 45.0k/s, V0 +9.7k/s, asini 0.916.
Gamma Velorum group.

Survey Image

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