Delta Sagittae — Star in Sagitta
Observe
1Physical Properties
Magnitude
3.82
Range
3.68 - 3.90
Period
47 days
Variable Type
Semi-Regular Variable
Spectral Type
M2II + B0V
Star Color
Red
(B-V 1.41)
Distance
582 ly
2Position & Identifiers
RA
19h 47m 23.3s
Dec
+18° 32' 03.0"
Constellation
Sagitta
(Sge)
HR
7536
HIP
97365
HD
187077
Bayer
Delta
Flamsteed
7 Sge
Variable ID
Del Sge
Querying VizieR catalog...
3How easy to spot?
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Easy | 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
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Best season
Jun – Aug
(peak: Jul)
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6
Size Comparison
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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
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14Stellar Notes
Amp. 0.09p.
Suspected visual double probably single image, composite spectrum. Secondary either B6 or A0V.
3725d, K 7.5k/s, V0 +1.9k/s, asini 364, vsini of both components =<50k/s.
In reflection nebula; Gamma Cas-type nebula. Assoc. of Delta Sge with nebula probable but not certain; nebula | could be HII region excited by O8f star, 9 Sge, HR 7574.
15
Light Travel Time Machine
16
Relativistic Travel
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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.
9 Sge
Hot blue O-type star
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mag 6.23
1.2°
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1.5°
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10 Sge
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Variable Star
mag 5.36
2.8°
Sagitta
Gamma Sge
Cool red giant
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mag 3.47
2.9°
Sagitta
NGC 6802
Open cluster
Open Cluster
mag 8.8
4.3°
Vulpecula
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