HIP 90485 — Double Star in Sagittarius
Observe
1Physical Properties
Magnitude
5.92
Spectral Type
F9V
Star Color
Yellow
(B-V 0.52)
2Position & Identifiers
RA
18h 27m 49.5s
Dec
-29° 48' 59.0"
Constellation
Sagittarius
(Sgr)
HR
6907
HIP
90485
HD
169830
SAO
186838
Querying VizieR catalog...
3How easy to split?
Primary
5.9 mag
Companion
9.4 mag
Separation
11.1″
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| Telescope | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| 80 mm refractor 80mm refr. | Easy | Medium+ | Medium |
| 150 mm Newton 150mm Newt. | Easy | Easy | Easy |
| Celestron C8 (203 mm SCT) C8 203mm | 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)
5Multiple Star System
Separation
11.1″
Companion Mag
9.3
Position Angle
265°
Star Colors
A: Yellow
B: Orange
Discoverer
RAG 2
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
A: 5.9 · B: 9.3 · Sep: 11.1″ · PA: 265° · N up, E right
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″
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6
Size Comparison
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7
Compare Stars
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
14
Exoplanets
2 known planets
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View this system in the 3D Orrery
Interactive Keplerian orbits, procedural planet textures, habitable zone.
| Planet | Radius | Mass | Period | Distance |
|---|---|---|---|---|
| HD 169830 b | 13.20R⊕ | 2.53M♃ | 225.7d | 123ly |
| HD 169830 c | 12.60R⊕ | 7.67M♃ | 5.0yr | 123ly |
Habitable Zone
Size & Mass Comparison
About exoplanets — how we find them and which host stars you can observe
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 6624
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Globular Cluster
mag 8.3
1.0°
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RS Sgr
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Variable Star
mag 6.16
4.8°
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NGC 6520
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mag 8.0
5.7°
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Eta Sgr
Easy double, sep 3.5″
Double Star
mag 3.11
7.3°
Sagittarius
4 Sgr
Colorful double, sep 3.7″
Double Star
mag 4.76
8.7°
Sagittarius
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