Phi Aquilae — Double Star in Aquila
Observe
1Physical Properties
Magnitude
5.28
Spectral Type
A1IV
subgiant
Star Color
Blue-white
(B-V -0.01)
Distance
142 ly
2Position & Identifiers
RA
19h 56m 14.3s
Dec
+11° 25' 26.0"
Constellation
Aquila
(Aql)
HR
7610
HIP
98103
HD
188728
SAO
105438
Bayer
Phi
Flamsteed
61 Aql
Querying VizieR catalog...
3How easy to split?
Primary
5.3 mag
Companion
10.0 mag
Separation
2.9″
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| Telescope | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| 80 mm refractor 80mm refr. | V. hard+ | V. hard+ | V. hard+ |
| 150 mm Newton 150mm Newt. | Hard | Hard | Hard |
| Celestron C8 (203 mm SCT) C8 203mm | Hard+ | Hard+ | Hard+ |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
To reach "Medium" at Bortle 3, you'd need at least a 230 mm reflector.
4Visibility
Set a location in User Settings to see visibility data.
Best season
Jun – Aug
(peak: Jul)
5Multiple Star System
Separation
2.9″
Companion Mag
10.0
Position Angle
185°
Star Colors
A: Blue-white
B: Orange
Discoverer
DRS 19
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
A: 5.3 · B: 10.0 · Sep: 2.9″ · PA: 185° · 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
Discover
14Stellar Notes
3.3207d, K 37.2k/s, V0 -28.0k/s, asini 1.70.
15
Light Travel Time Machine
16
Relativistic Travel
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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