Theta Per
HIP 12777; Theta Per; 13 Per
DoubleStar
Per
Visible
Level 2
Small telescope (4") - Requires steady seeing
Physical Properties
Magnitude
4.12
Spectral Type
F8V
Star Color
Yellow
(B-V 0.49)
Distance
42.4 ly
Position & Identifiers
RA
02h 44m 12.0s
Dec
+49° 13' 42.0"
Constellation
Per
HR
799
HIP
12777
Bayer
Theta
Flamsteed
13 Per
Double Cat
2081
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
21.2″
Companion Mag
9.1
Companion Sp
M1.5
Position Angle
305°
Star Colors
A: Yellow
B: Red
Discoverer
STF 296
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 21.2″ · PA: 305° · 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 4.13 F7V, 9.87 M1V, 2720y, a = 22.289". C probably optical.
0.095".
Survey Image
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