Pi Tucanae — Double Star in Tucana
Observe
1Physical Properties
Magnitude
5.51
Spectral Type
B9V
Star Color
Blue-white
(B-V -0.05)
Distance
297 ly
2Position & Identifiers
RA
00h 20m 39.0s
Dec
-69° 37' 30.0"
Constellation
Tucana
(Tuc)
HR
83
HIP
1647
HD
1685
SAO
248167
Bayer
Pi
Querying VizieR catalog...
3How easy to split?
Primary
5.5 mag
Companion
10.1 mag
Separation
2.3″
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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 280 mm reflector.
4Visibility
Set a location in User Settings to see visibility data.
Best season
Aug – Oct
(peak: Sep)
5Multiple Star System
Separation
2.3″
Companion Mag
10.1
Position Angle
216°
Star Colors
A: Blue-white
B: Yellow
Discoverer
HUB 1
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
A: 5.5 · B: 10.1 · Sep: 2.3″ · PA: 216° · N up, E right
At limit · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″
Explore
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
Discover
14
Light Travel Time Machine
15
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.
NGC 121
Compact globular cluster
Globular Cluster
mag 10.6
2.0°
Tucana
NGC 176
Open cluster
Open Cluster
mag 12.0
3.7°
Tucana
NGC 406
Barred spiral galaxy
Galaxy
mag 12.0
4.0°
Tucana
Kappa Tuc
Easy double, sep 4.6″
Double Star
mag 4.86
4.9°
Tucana
Beta Tuc
HIP 2484; Beta1 Tucanae
Easy double, sep 27.1″
Double Star
mag 4.37
6.8°
Tucana
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