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Chi Draconis — Star in Draco

Magnitude 3.6m Star Draco (Dra) Visible
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1Physical Properties

Magnitude 3.57
Range 3.56 - 3.57
Variable Type ROT:
Spectral Type F7V (metal-weak)
Star Color Yellow (B-V 0.49)
Distance 27 ly

2Position & Identifiers

RA 18h 21m 03.4s
Dec +72° 43' 58.0"
Constellation Draco (Dra)
HR 6927
HIP 89937
HD 170153
SAO 9087
Bayer Chi
Flamsteed 44 Dra
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Easy Easy Medium+
50mm finder Easy Easy Easy
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 May – Jul (peak: Jun)

5Survey Image

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7

Size Comparison

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8

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9

Spectral Classification

10

Hertzsprung-Russell Diagram

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

A* 3.57 F7V, 0.768y, a = 0.124". Masses 1.5 and 1.1 Suns. Shortest known period for astrometric binary. Speckle | interferometry indicates component A is binary, sep. about 0.1". B, 12v K1V at 149"; C, 13.5v at 10".
280.531d, K 18.0k/s, V0 +32.5k/s, asini 62.0, i 60.1d. Resolved by speckle interferometry 1986.46, sep. 0.09" | (at 7000 Ang.)
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.

NGC 6654
Medium
Bright spiral galaxy
Galaxy mag 11.6 0.5° Draco
Dziban
HIP 86614; Psi1 Draconis; 31 Draconis
Easy
Easy double, sep 30.2″
Double Star mag 4.58 3.0° Draco
NGC 6543
Easy
Small bright planetary nebula
Planetary Nebula mag 9.0 6.4° Draco
Show on Map

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