15 Mon
Observable Double Star
Good (52/100)
Sep: 3.0", Companion: mag 7.8
HIP 31978; 15 Mon
DoubleStar
Mon
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
4.66
Spectral Type
O7V((f))
Star Color
Blue
(B-V -0.25)
Position & Identifiers
RA
06h 40m 58.7s
Dec
+09° 53' 44.0"
Constellation
Mon
HR
2456
HIP
31978
Flamsteed
15 Mon
Variable ID
S Mon
Double Cat
5322
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Visibility
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Multiple Star System
Components
13
Component IDs
AB
Separation
3.0″
Companion Mag
7.8
Companion Sp
B1:V
Position Angle
214°
Star Colors
A: Blue
B: Blue
Discoverer
STF 950
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 3.0″ · PA: 214° · N up, E left
At limit · 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
ADS 5322A, Ia? 4.62 - 4.67V. R-I also found at -0.11.
AB binary, 4.8 Oe5, 7.6 B7; C, 9.9v B8V at 17", physical, vsini 141k/s; D, 9.7v A6III at 41", physical, vsini 115k/s; | E1 the brighter component of E, B5V at 74", probably optical, vsini 253k/s; E2, A0V, vsini 132k/s.
Color excess E(B-V) = +0.07.
In cluster NGC 2264 #131; HII reg. S273; Mon OB1; T-Tauri assoc., Mon T1. The cluster appears to be the nucleus of the | association. In region of neutral hydrogen. Ionized Mon OB1 region probably excited by S Mon. The electron density of | the HII region increases toward the center of the cluster. (Note that OB associations MonI = IIMon = Mon OB1 and MonII = | IMon = OB2. In conversions from the earlier designations to OB1 and OB2 these groups have occasionally been | interchanged; however, they may be related.)
Also classified O8III((f)). uv 1240 absorption strong.
0.005".
Survey Image
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