23 Vulpeculae — Double Star in Vulpecula
Observe
1Physical Properties
Magnitude
4.52
Spectral Type
K3-IIIFe-1
Star Color
Orange
(B-V 1.26)
(reddened by dust)
Distance
408 ly
2Position & Identifiers
RA
20h 15m 46.1s
Dec
+27° 48' 51.0"
Constellation
Vulpecula
(Vul)
HR
7744
HIP
99874
HD
192806
SAO
88428
Flamsteed
23 Vul
Querying VizieR catalog...
3How easy to spot?
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Medium+ | Medium | Medium |
| 50 mm finder 50mm finder | Easy | Easy | Easy |
| 150 mm telescope 150mm scope | 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
0.2″
Companion Mag
6.9
Position Angle
138°
Star Colors
A: Orange
(reddened by dust)
Discoverer
MCA 60
Separation over time
Period: 45.4 y
Eccentricity: 0.595
Now: 0.23", PA 140°
+ 0.04" in 5 years
Apparent separation over time, computed from ORB6 orbital elements. Steep curves indicate fast-changing pairs — catch them while they're splittable.
Explore
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
Also classified K3III CN-1 Ba0.3 Fe-1.
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.
C37
NGC 6885
Open cluster
Open Cluster
mag 6.0
1.5°
Vulpecula
22 Vul
Observable variable star
Variable Star
mag 5.15
4.3°
Vulpecula
13 Vul
Tight double — a rewarding split at 1.5″
Double Star
mag 4.58
6.3°
Vulpecula
M27
Dumbbell Nebula
Planetary nebula — try an OIII filter
Planetary Nebula
mag 7.4
6.3°
Vulpecula
49 Cyg
Tight double — a rewarding split at 2.8″
Double Star
mag 5.51
7.1°
Cygnus
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