Pi Ari
Observable Double Star
Excellent (60/100)
Sep: 3.3", Companion: mag 8.0
HIP 13165; Pi Ari; 42 Ari
DoubleStar
Ari
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
5.22
Spectral Type
B6V
Star Color
Blue-white
(B-V -0.06)
Position & Identifiers
RA
02h 49m 17.5s
Dec
+17° 27' 51.0"
Constellation
Ari
HR
836
HIP
13165
Bayer
Pi
Flamsteed
42 Ari
Double Cat
2151
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Visibility
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Multiple Star System
Components
4
Component IDs
A
Separation
3.3″
Companion Mag
8.0
Position Angle
118°
Star Colors
A: Blue-white
B: Yellow-white
Discoverer
STF 311
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 3.3″ · PA: 118° · N up, E left
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
Size Comparison
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Stellar Lifecycle
Spectral Classification
Hertzsprung-Russell Diagram
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Blackbody Spectrum
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
Stellar Notes
AB CPM. B 8.8v, A0Vp at 3.2", RV -21k/s, probably optical; C 10.72V, +0.60(B-V), +0.60(U-B), F8V at 25". A is close SB | pair with computed sep. 0.00004".
ADS 2151A, 3.854d, K 24.8k/s, V0 +7.8k/s, asini 1.31.
Survey Image
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