U Sagittae — Variable Star in Sagitta
Excellent (74/100)
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1Physical Properties
Magnitude
6.58
Range
6.45 - 9.28
Period
3.4 days
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
B8III+K:
giant
Star Color
White
(B-V 0.03)
2Position & Identifiers
RA
19h 18m 48.5s
Dec
+19° 36' 38.0"
Constellation
Sagitta
(Sge)
HR
7326
HIP
94910
HD
181182
SAO
104711
Variable ID
U Sge
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3How easy to follow?
Magnitude
6.6 – 9.2 mag
Amplitude
2.6 mag
Period
3.38 d
Type
EA/SD
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Imp. | Imp. | Imp. |
| 50 mm finder 50mm finder | Medium+ | Medium | Hard+ |
| 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)
5Survey Image
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6Light Curve
7Comparison Stars for U Sge (6.6–9.2)
Nearby stable stars for estimating brightness (AAVSO)
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8
Size Comparison
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9
Compare Stars
10
Spectral Classification
11
Hertzsprung-Russell Diagram
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12
Stellar Lifecycle
13
Blackbody Spectrum
14
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
15
Stellar Fusion
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16Stellar Notes
EA 6.58 - 9.18V, 3.3806260d. Period varies irregularly. i 90d. Semi-detached system.
3.3806d, K 69.7k/s, V0 -10.1k/s, asini 3.24. Alternate orbit 3.3806205d, K 76k/s, V0 -5k/s, asini 3.25.
In cluster 4-5 Vul = Collinder 399 (nonmember).
Shell star.
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 6802
Open cluster
Open Cluster
mag 8.8
2.8°
Vulpecula
U Vul
Pulsating variable, period 8.0d
Variable Star
mag 7.14
4.2°
Vulpecula
FF Aql
Pulsating variable, period 4.5d
Variable Star
mag 5.38
5.4°
Aquila
M71
NGC 6838
Globular cluster — dense ball of ancient stars
Globular Cluster
mag 8.3
8.3°
Sagitta
V473 Lyr
Pulsating variable, period 1.5d
Variable Star
mag 6.16
8.3°
Lyra
10 Sge
Pulsating variable, period 8.4d
Variable Star
mag 5.36
9.3°
Sagitta
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