Observe
1Physical Properties
Magnitude
6.04
Range
5.60 - 6.60
Period
120 days
Variable Type
Semi-Regular Variable (Supergiant)
Spectral Type
M4.5-M5+II
Star Color
Red
(B-V 1.65)
2Position & Identifiers
RA
18h 38m 06.5s
Dec
+39° 40' 05.0"
Constellation
Lyra
(Lyr)
HR
7009
HIP
91373
HD
172380
Variable ID
XY Lyr
Querying VizieR catalog...
3How easy to follow?
Magnitude
5.8 – 6.4 mag
Amplitude
0.6 mag
Period
120 d
Type
SRC
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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 | Hard+ |
| 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)
5Light Curve
6Comparison Stars for XY Lyr (5.8–6.3)
Nearby stable stars for estimating brightness (AAVSO)
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Explore
7
Size Comparison
Querying VizieR for stellar data…
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
Discover
15Stellar Notes
Lc 5.80 - 6.35V, 7.3 - 7.8p.
H2O absorption.
Survey Image
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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.
Vega
HIP 91262; Alpha Lyrae; 3 Lyrae
Bright naked-eye star, mag 0.0
Double Star
mag 0.03
0.9°
Lyra
T Lyr
Variable star, range 7.5–9.2
Variable Star
mag 7.50
2.9°
Lyra
13 Lyr
Semi-regular variable, range 3.9–5.0
Variable Star
mag 4.04
5.3°
Lyra
NGC 6703
Elliptical galaxy
Galaxy
mag 11.4
6.1°
Lyra
Sheliak
HIP 92420; Beta Lyrae; 10 Lyrae
Eclipsing binary, period 12.9d
Variable Star
mag 3.45
6.7°
Lyra
M57
NGC 6720
Planetary nebula — try an OIII filter
Planetary Nebula
mag 9.0
7.3°
Lyra
RR Lyr
Pulsating variable, period 13.6h
Variable Star
mag 7.10
9.4°
Lyra
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