Gamma Delphini — Double Star in Delphinus
HIP 102531; Gamma1 Delphini; 12 Delphini
Showpiece (75/100)
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1Physical Properties
Magnitude
5.14
Spectral Type
F7V
Star Color
Yellow
(B-V 0.49)
Distance
125 ly
2Position & Identifiers
RA
20h 46m 38.7s
Dec
+16° 07' 28.0"
Constellation
Delphinus
(Del)
HR
7947
HIP
102531
HD
197963
SAO
106475
Bayer
Gamma1
Flamsteed
12 Del
Double Cat
14279
Querying VizieR catalog...
3How easy to split?
Primary
5.1 mag
Companion
5.0 mag
Separation
9.8″
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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
Set a location in User Settings to see visibility data.
Best season
Jun – Aug
(peak: Jul)
5Multiple Star System
Separation
9.8″
Companion Mag
5.0
Star Colors
A: Yellow
B: Orange
3249y, a = 13.813". Binary with HR 7948.
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
A: 5.1 · B: 5.0 · Sep: 9.8″ · PA: ? · N up, E right
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″
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6
Size Comparison
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7
Compare Stars
8
Spectral Classification
9
Hertzsprung-Russell Diagram
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10
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
Discover
14Stellar Notes
Wolf 630 group.
0.033".
15
Light Travel Time Machine
16
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 102532; Gamma2 Delphini; 12 Delphini
Colorful double, sep 8.8″
Double Star
mag 4.27
0.0°
Delphinus
U Del
Semi-regular variable, range 6.1–7.6
Variable Star
mag 6.38
2.0°
Delphinus
C42
NGC 7006
Globular cluster — dense ball of ancient stars
Globular Cluster
mag 10.6
3.6°
Delphinus
Kappa Del
Easy double, sep 214.6″
Double Star
mag 5.05
6.3°
Delphinus
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