R Canis Majoris — Variable Star in Canis Major
Excellent (66/100)
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1Physical Properties
Magnitude
5.70
Range
5.7 - 6.3
Period
27.3 hours
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
F1V
Star Color
Yellow-white
(B-V 0.35)
Distance
82 ly
2Position & Identifiers
RA
07h 19m 28.1s
Dec
-16° 23' 42.0"
Constellation
Canis Major
(CMa)
HR
2788
HIP
35487
HD
57167
SAO
152724
Variable ID
R CMa
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3How easy to follow?
Magnitude
5.7 – 6.3 mag
Amplitude
0.6 mag
Period
1.14 d
Type
EA/SD
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | V. hard+ | V. hard | V. hard |
| 50 mm finder 50mm finder | Medium | Medium | Medium |
| 150 mm telescope 150mm scope | Medium | Medium | Medium |
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
Dec – Feb
(peak: Jan)
5Survey Image
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6Light Curve
7Comparison Stars for R CMa (5.7–6.3)
Nearby stable stars for estimating brightness (AAVSO)
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Explore
8
Size Comparison
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9
Compare Stars
10
Spectral Classification
11
Hertzsprung-Russell Diagram
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12
Stellar Lifecycle
13
Blackbody Spectrum
14
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
15
Stellar Fusion
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16Stellar Notes
EA 5.70 - 6.34V, 1.13593876d. Per. changes, possibly sinusoidally. i 77d.
1.1359d, K 31.5k/s, V0 -42.5k/s, asini 0.492. Probable large scale mass exchange. Secondary is K3IV-V.
17
Light Travel Time Machine
18
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 2360
Open cluster
Open Cluster
mag 7.2
0.9°
Canis Major
NGC 2438
Planetary nebula — try an OIII filter
Planetary Nebula
mag 10.0
5.6°
Puppis
Mu CMa
Colorful double, sep 2.8″
Double Star
mag 5.00
6.1°
Canis Major
29 CMa
Eclipsing binary, period 4.4d
Variable Star
mag 4.98
8.2°
Canis Major
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