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Delta Delphini — Star in Delphinus

Magnitude 4.4–4.5m Star Delphinus (Del) Visible
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1Physical Properties

Magnitude 4.43
Range 4.38 - 4.49
Period 3.8 hours
Variable Type Delta Scuti (Pulsating)
Spectral Type A7IIIpDel Del bright giant
Star Color Yellow-white (B-V 0.32)
Distance 251 ly

2Position & Identifiers

RA 20h 43m 27.5s
Dec +15° 04' 28.0"
Constellation Delphinus (Del)
HR 7928
HIP 102281
HD 197461
SAO 106425
Bayer Delta
Flamsteed 11 Del
Variable ID Del Del
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium+ Medium 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 Jun – Aug (peak: Jul)

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

Delta Sct 4.39 - 4.49V, 0.135547 and 0.154991d. Combined magnitude of two components.
40.58d. Both components Delta Sct type variables.
Sirius group?
Underabundant metals. Also classified F0IVp.
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.

Gamma Del
HIP 102531; Gamma1 Delphini; 12 Delphini
Easy
Colorful double, sep 9.8″
Double Star mag 5.14 1.3° Delphinus
U Del
Easy
Semi-regular variable, range 6.1–7.6
Variable Star mag 6.38 3.1° Delphinus
C42
NGC 7006
Medium+
Globular cluster — dense ball of ancient stars
Globular Cluster mag 10.6 4.5° Delphinus
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