Observe
1Physical Properties
Magnitude
6.61
Variable Type
Eclipsing Binary (Beta Lyrae-type)
Spectral Type
B3III
Star Color
White
(B-V 0.02)
Position & Identifiers
RA
18h 08m 54.1s
Dec
-25° 28' 21.0"
Constellation
Sagittarius
(Sgr)
HR
6773
HIP
88905
HD
165814
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2Visibility
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Best season
May – Jul
(peak: Jun)
3How easy to follow?
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | V. hard | Imp. | Imp. |
| 50 mm finder 50mm finder | Hard+ | Hard+ | Hard+ |
| 150 mm telescope 150mm scope | Hard+ | Hard+ | Hard+ |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Comparison Stars for HIP 88905 (6.4–6.9)
Nearby stable stars for estimating brightness (AAVSO)
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5
Size Comparison
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6
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7
Stellar Lifecycle
8
Spectral Classification
9
Hertzsprung-Russell Diagram
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10
Blackbody Spectrum
11
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
12
Stellar Fusion
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13Stellar Notes
EB 6.43 - 6.88V, 2.24815d. Mass transfer indicated. The var. is probably the 8.85V companion of the visual double. GCVS | gives combined light.
Visual companion is blue.
2.2481d, K 151k/s, V0 -6k/s, msin3i 6.42, asini 4.66. Mean mass components 5.5 solar.
Survey Image
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