HIP 109745 — Double Star in Lacerta
Observe
1Physical Properties
Magnitude
5.53
Spectral Type
A0III
giant
Star Color
White
(B-V 0.04)
2Position & Identifiers
RA
22h 13m 49.3s
Dec
+45° 26' 27.0"
Constellation
Lacerta
(Lac)
HR
8487
HIP
109745
HD
211096
SAO
51783
Querying VizieR catalog...
3How easy to split?
Primary
5.5 mag
Companion
9.4 mag
Separation
1.5″
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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. | V. hard+ | V. hard+ | V. 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 320 mm reflector.
4Visibility
Set a location in User Settings to see visibility data.
Best season
Jul – Sep
(peak: Aug)
5Multiple Star System
Separation
1.5″
Companion Mag
9.4
Position Angle
16°
Star Colors
A: White
B: Yellow
Discoverer
DCH 118
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
A: 5.5 · B: 9.4 · Sep: 1.5″ · PA: 16° · N up, E right
Unresolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″
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6
Size Comparison
Querying VizieR for stellar data…
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
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.
AR Lac
Eclipsing binary, period 2.0d
Variable Star
mag 6.11
0.9°
Lacerta
NGC 7209
Rich open cluster
Open Cluster
mag 6.7
1.8°
Lacerta
Cocoon Nebula
IC 5146
Emission nebula — try an OIII filter
Emission Nebula
mag 10.0
4.0°
Cygnus
8 Lac
Easy double, sep 22.5″
Double Star
mag 5.73
7.1°
Lacerta
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