Nu Tauri — Double Star in Taurus
Observe
1Physical Properties
Magnitude
3.91
Spectral Type
A0.5V
Star Color
Blue-white
(B-V 0.03)
Distance
117 ly
2Position & Identifiers
RA
04h 03m 09.4s
Dec
+05° 59' 21.0"
Constellation
Taurus
(Tau)
HR
1251
HIP
18907
HD
25490
SAO
111579
Bayer
Nu
Flamsteed
38 Tau
Querying VizieR catalog...
3How easy to split?
Primary
3.9 mag
Companion
9.2 mag
Separation
16.1″
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| Telescope | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| 80 mm refractor 80mm refr. | Medium+ | 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
Set a location in User Settings to see visibility data.
Best season
Oct – Dec
(peak: Nov)
5Multiple Star System
Separation
16.1″
Companion Mag
9.2
Position Angle
183°
Star Colors
A: Blue-white
Discoverer
DRS 36
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
A: 3.9 · B: 9.2 · Sep: 16.1″ · PA: 183° · N up, E right
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″
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7
Size Comparison
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8
Compare Stars
9
Spectral Classification
10
Hertzsprung-Russell Diagram
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11
Stellar Lifecycle
12
Blackbody Spectrum
13
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
14
Stellar Fusion
Discover
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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