RS Sagittarii — Variable Star in Sagittarius
Excellent (62/100)
Observe
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
(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
SAO
209959
Variable ID
RS Sgr
Querying VizieR catalog...
3How easy to follow?
Magnitude
6.0 – 7.0 mag
Amplitude
1.0 mag
Period
2.42 d
Type
EA/SD
Sign in
and configure your equipment and default location to see a personalized row.
| 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
Set a location in User Settings to see visibility data.
Best season
May – Jul
(peak: Jun)
5Survey Image
Loading survey image…
6Light Curve
7Comparison Stars for RS Sgr (6.0–7.0)
Nearby stable stars for estimating brightness (AAVSO)
Loading comparison stars…
Explore
8
Size Comparison
Querying VizieR for stellar data…
9
Compare Stars
10
Spectral Classification
11
Hertzsprung-Russell Diagram
Loading HR diagram…
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
Discover
16Stellar 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.
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
Ptolemy's Cluster
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
Explore Nightbase
Related knowledge, tools, and stories — no observation planning required.
Arthur Eddington
1919 eclipse expedition confirming general relativity; first theory of stellar interiors; the Eddington limit
Biography
Variable Stars — A Guide for Observers
A practical guide to visual observation of variable stars: estimating magnitudes, finding comparison stars, recording data, and contributing to science with AAVSO.
Article
Sagittarius
Mythology, bright stars, and deep-sky highlights.
Constellation
