V686 Coronae Australis — Star in Corona Australis
Observe
1Physical Properties
Magnitude
5.38
Range
5.25 - 5.41
Period
7.3 days
Variable Type
Alpha2 CVn (Magnetic Rotating)
Spectral Type
B8IVSi
subgiant
Star Color
Blue-white
(B-V -0.14)
2Position & Identifiers
RA
18h 56m 40.5s
Dec
-37° 20' 36.0"
Constellation
Corona Australis
(CrA)
HR
7129
HIP
92989
HD
175362
SAO
210734
Variable ID
V686 CrA
Querying VizieR catalog...
3How easy to spot?
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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
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Best season
May – Jul
(peak: Jun)
5Survey Image
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6
Size Comparison
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7
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8
Spectral Classification
9
Hertzsprung-Russell Diagram
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10
Stellar Lifecycle
11
Blackbody Spectrum
12
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
13
Stellar Fusion
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14Stellar Notes
Alpha CV 5.25 - 5.41V, 3.6733d. Similar period for He-line intensities, magnetic field.
Sco-Cen cluster; member of the local association (Pleiades group); Sco-Cen assoc.
Helium-weak star of Alpha Scl subgroup. Possibly hottest magnetic star known, about 20,000K.
7.34d.
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 6723
Globular cluster — dense ball of ancient stars
Globular Cluster
mag 7.3
0.9°
Sagittarius
C68
NGC 6729
Diffuse nebula
Diffuse Nebula
mag 10.0
1.1°
Corona Australis
Gamma CrA
HIP 93825; Gamma Coronae Australis
Tight double — a rewarding split at 1.6″
Double Star
mag 4.93
2.0°
Corona Australis
NGC 6768
Elliptical galaxy
Galaxy
mag 12.85
4.8°
Corona Australis
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