17 Sextantis — Double Star in Sextans
Observe
1Physical Properties
Magnitude
5.91
Spectral Type
A1V
Star Color
White
(B-V 0.02)
2Position & Identifiers
RA
10h 10m 07.5s
Dec
-08° 24' 30.0"
Constellation
Sextans
(Sex)
HR
3989
HIP
49812
HD
88195
SAO
137385
Flamsteed
17 Sex
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3How easy to spot?
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Hard+ | Hard | V. 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
Jan – Mar
(peak: Feb)
5Multiple Star System
Separation
0.2″
Companion Mag
9.3
Position Angle
9°
Star Colors
A: White
B: Yellow
Discoverer
CHR 177
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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
Strong shell absorption; no emission except possibly a weak effect on the violet wing of H alpha.
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.
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Deep dive
