Delta Cir
HIP 74778; Delta Cir
DoubleStar
Cir
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
5.09
Variable Type
Ellipsoidal Variable
Spectral Type
O8.5V
Star Color
Blue-white
(B-V -0.06)
Position & Identifiers
RA
15h 16m 56.7s
Dec
-60° 57' 27.0"
Constellation
Cir
HR
5664
HIP
74778
Bayer
Delta
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Visibility
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Multiple Star System
Separation
53.9″
Companion Mag
12.9
Companion Sp
B
Position Angle
279°
Star Colors
A: Blue-white
B: Blue
Discoverer
HDO 245
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 53.9″ · PA: 279° · 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
Component A of double, Ell?, amp. 0.08V.
CPM with the triple star HR 5661. Faint companion of HR 5664, G5V, probably optical.
3.9025d, K 158.3k/s, V0 +9.2k/s, asini 8.46.
Also classified O7.5III((f)).
Survey Image
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