GT Muscae — Double Star in Musca
Observe
1Physical Properties
Magnitude
5.17
Range
4.96 - 5.23
Period
2.8 days
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
G2III+A0V
Star Color
Orange
(B-V 0.80)
Distance
544 ly
2Position & Identifiers
RA
11h 39m 29.4s
Dec
-65° 23' 52.0"
Constellation
Musca
(Mus)
HR
4492
HIP
56862
HD
101380
Variable ID
GT Mus
Querying VizieR catalog...
3How easy to spot?
Sign in
and configure your equipment and default location to see a personalized row.
| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Medium | Hard+ | Hard |
| 50 mm finder 50mm finder | Easy | Easy | Easy |
| 150 mm telescope 150mm scope | Easy | Easy | Easy |
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
Feb – Apr
(peak: Mar)
5Light Curve
6Multiple Star System Quadruple
Components
4 (quadruple)
Component IDs
AB
Separation
0.2″
Companion Mag
6.6
Companion Sp
A0V
Position Angle
123°
Star Colors
A: Orange
B: Blue-white
Discoverer
B 1705
5.5 G0, 6.3 A0, combined mag., colors.
Separation over time
Period: 90.9 y
Eccentricity: 0.568
Now: 0.24", PA 130°
+ 0.01" in 5 years
Apparent separation over time, computed from ORB6 orbital elements. Steep curves indicate fast-changing pairs — catch them while they're splittable.
Explore
7
Size Comparison
Querying VizieR for stellar data…
8
Compare Stars
9
Spectral Classification
10
Hertzsprung-Russell Diagram
Loading HR diagram…
11
Stellar Lifecycle
12
Blackbody Spectrum
13
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
14
Stellar Fusion
Discover
15Stellar Notes
Also classified G5-8IIIp + A0-1V.
16
Light Travel Time Machine
17
Relativistic Travel
Survey Image
Loading survey image…
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.
Explore Nightbase
Related knowledge, tools, and stories — no observation planning required.
Double Stars — A Guide for Observers
Two suns where one appeared — how to find, split, and appreciate the night sky's finest pairs. From Albireo's gold-and-blue to the Sirius B challenge.
Article
Musca
Mythology, bright stars, and deep-sky highlights.
Constellation
Mars
Polar caps, dust storms, and observing its oppositions.
Deep dive
