13 Lyrae — Variable Star in Lyra
Excellent (73/100)
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1Physical Properties
Magnitude
4.04
Range
3.81 - 4.44
Period
46 days
Variable Type
Semi-Regular Variable (Late-type Giant)
Spectral Type
M5III
giant
Star Color
Red
(B-V 1.59)
2Position & Identifiers
RA
18h 55m 20.1s
Dec
+43° 56' 46.0"
Constellation
Lyra
(Lyr)
HR
7157
HIP
92862
HD
175865
SAO
47919
Flamsteed
13 Lyr
Variable ID
R Lyr
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3How easy to follow?
Magnitude
3.9 – 5.0 mag
Amplitude
1.1 mag
Period
46 d
Type
SRB
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Medium | Hard+ | Hard |
| 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
Set a location in User Settings to see visibility data.
Best season
May – Jul
(peak: Jun)
5Survey Image
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6Light Curve
7Comparison Stars for 13 Lyr (3.9–5.0)
Nearby stable stars for estimating brightness (AAVSO)
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Explore
9
Size Comparison
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10
Compare Stars
11
Spectral Classification
12
Hertzsprung-Russell Diagram
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13
Stellar Lifecycle
14
Blackbody Spectrum
15
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
16
Stellar Fusion
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17Stellar Notes
SRb 3.88 - 5.0V, 46.0d.
Variation in RV at one time interpreted as possibly due to a triple system: ab 41.3d, K 3.95k/s, V0 -36.6k/s, asini | 2.235; and abxc 5 yrs., K 4.55k/s, V0 -31.8k/s, asini 97.683.
Hyades group.
H2O absorption.
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.
NGC 6703
Elliptical galaxy
Galaxy
mag 11.4
2.1°
Lyra
Epsilon¹ Lyr
Tight double — a rewarding split at 2.2″
Double Star
mag 5.06
4.7°
Lyra
XY Lyr
Semi-regular variable, range 5.8–6.3
Variable Star
mag 6.04
5.3°
Lyra
RR Lyr
Pulsating variable, period 13.6h
Variable Star
mag 7.10
5.6°
Lyra
NGC 6791
Open cluster
Open Cluster
mag 9.5
7.8°
Lyra
T Lyr
Variable star, range 7.5–9.2
Variable Star
mag 7.50
8.2°
Lyra
V973 Cyg
Semi-regular variable, range 6.1–6.8
Variable Star
mag 6.34
9.7°
Cygnus
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