RY Sagittarii — Variable Star in Sagittarius
Good (57/100)
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1Physical Properties
Magnitude
6.25
Range
5.8 - 14.0
Period
38 days
Variable Type
R Coronae Borealis (Carbon Star)
Spectral Type
G0Ipe(C1,0)
Star Color
White
(B-V 0.02)
2Position & Identifiers
RA
19h 16m 32.8s
Dec
-33° 31' 18.0"
Constellation
Sagittarius
(Sgr)
HR
7296
HIP
94730
HD
180093
SAO
211117
Variable ID
RY Sgr
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3How easy to follow?
Magnitude
6.1 – 6.8 mag
Amplitude
0.7 mag
Period
38 d
Type
RCB
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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
Jun – Aug
(peak: Jul)
5Survey Image
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6Light Curve
7Comparison Stars for RY Sgr (6.1–6.8)
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
RCB 6.0 - >15.0v. Also pulsations 38.454d, changing amplitude. Observations 1984-86 indicate semiregular pulsations | of 33 to 40d, 6.13 - 6.78V, 0.38 - 0.76(B-V), -0.09 to +0.52(U-B).
Possible extinction by circumstellar dust.
Hydrogen deficient carbon star.
38.6d.
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.
Gamma CrA
HIP 93825; Gamma Coronae Australis
Tight double — a rewarding split at 1.6″
Double Star
mag 4.93
4.1°
Corona Australis
C68
NGC 6729
Diffuse nebula
Diffuse Nebula
mag 10.0
4.6°
Corona Australis
NGC 6723
Globular cluster — dense ball of ancient stars
Globular Cluster
mag 7.3
4.7°
Sagittarius
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