RS Sagittarii — Variable Star in Sagittarius
Excellent (62/100)
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1Physical Properties
Magnitude
6.16
Range
6.01 - 6.97
Period
2.4 days
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
B3V+A
Star Color
Blue-white
(B-V -0.11)
2Position & Identifiers
RA
18h 17m 36.1s
Dec
-34° 06' 26.0"
Constellation
Sagittarius
(Sgr)
HR
6833
HIP
89637
HD
167647
Variable ID
RS Sgr
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3How easy to follow?
Magnitude
6.0 – 7.0 mag
Amplitude
1.0 mag
Period
2.42 d
Type
EA/SD
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | V. hard | V. hard | Imp. |
| 50 mm finder 50mm finder | Medium+ | Medium+ | Medium+ |
| 150 mm telescope 150mm scope | Medium+ | Medium+ | Medium+ |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Visibility
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Best season
May – Jul
(peak: Jun)
5Light Curve
6Comparison Stars for RS Sgr (6.0–7.0)
Nearby stable stars for estimating brightness (AAVSO)
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7
Size Comparison
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8
Compare Stars
9
Spectral Classification
10
Hertzsprung-Russell Diagram
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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
EA 6.0 - 6.9p, 2.4156832d. Period changes. Component A of visual double.
B, 9.68V at 39"; CD, 8.7, 10.2v, sep. 16.5".
2.4157d, K 85.1k/s, V0 +6.0k/s, asini 2.82.
Also classified B4IV.
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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.
Epsilon Sgr
KAUS AUSTRALIS
Bright naked-eye star, mag 1.9
Star
mag 1.85
1.4°
Sagittarius
NGC 6569
Globular cluster — dense ball of ancient stars
Globular Cluster
mag 8.7
2.4°
Sagittarius
Eta Sgr
Easy double, sep 3.5″
Double Star
mag 3.11
2.7°
Sagittarius
M7
NGC 6475
Open cluster
Open Cluster
mag 3.3
4.9°
Scorpius
Gamma Sgr
HIP 88567; Gamma1 Sagittarii
Pulsating variable, period 7.6d
Variable Star
mag 4.69
5.3°
Sagittarius
3 Sgr
Pulsating variable, period 7.0d
Variable Star
mag 4.54
9.0°
Sagittarius
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