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Theta Microscopii — Star in Microscopium

HIP 105382; Theta1 Microscopii

Magnitude 4.8–4.9m Star Microscopium (Mic) Visible
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1Physical Properties

Magnitude 4.82
Range 4.77 - 4.87
Period 2.1 days
Variable Type Alpha2 CVn (Magnetic Rotating)
Spectral Type ApCrEuSr
Star Color Yellow-white (B-V 0.02)
Distance 272 ly

2Position & Identifiers

RA 21h 20m 45.6s
Dec -40° 48' 35.0"
Constellation Microscopium (Mic)
HR 8151
HIP 105382
HD 203006
SAO 230644
Bayer Theta1
Variable ID The1 Mic
SIMBAD Wikipedia

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium+ Medium Hard+
50mm finder Easy Easy Easy
150mm scope Easy Easy Easy
Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

4Visibility

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Best season Jul – Sep (peak: Aug)

5Survey Image

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6

Size Comparison

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7

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8

Spectral Classification

9

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
10

Stellar Lifecycle

11

Blackbody Spectrum

12

Stellar Absorption Spectrum

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

13

Stellar Fusion

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14Stellar Notes

Alpha CV 4.77 - 4.87V, 2.1215d.
15

Light Travel Time Machine

16

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.

IC 5105
Medium+
Elliptical galaxy
Galaxy mag 11.5 0.7° Microscopium
T Ind
Medium
Semi-regular variable, range 5.8–6.5
Variable Star mag 6.00 4.2° Indus
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