When is the best time to observe Theta Apodis?

Theta Apodis is best observed from March through May, with peak visibility during April when it transits around midnight in the Northern Hemisphere.

Where is Theta Apodis located in the sky?

Theta Apodis lies in the constellation Apus at right ascension 14h 05m and declination -76° 48′.

What telescope do I need to follow Theta Apodis?

To follow Theta Apodis through its full brightness cycle (magnitude 4.7 to 6.2) you need any 7×50 or 10×50 binoculars — the star fades out of smaller apertures near minimum light.

Theta Apodis — Variable Star in Apus

Observable Variable Star Excellent (68/100)

Range: 4.65 - 6.2, Period: 111.0d, Type: SRB

Magnitude 4.7–6.2^m VariableStar Apus (Aps) Visible

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1Physical Properties

Magnitude 5.50

Range 4.65 - 6.2

Period 111 days

Variable Type Semi-Regular Variable (Late-type Giant)

Spectral Type M6.5III: giant

Star Color Red (B-V 1.55)

2Position & Identifiers

RA 14h 05m 19.8s

Dec -76° 47' 48.0"

Constellation Apus (Aps)

HR 5261

HIP 68815

HD 122250

SAO 257112

Bayer Theta

Variable ID The Aps

SIMBAD

3How easy to follow?

Magnitude 4.7 – 6.2 mag Amplitude 1.6 mag Period 111 d Type SRB

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Equipment	Bortle 3	Bortle 4	Bortle 5
Naked eye Naked eye	Hard	V. hard+	V. 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

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Best season Mar – May (peak: Apr)

5Survey Image

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6Light Curve

7Comparison Stars for Theta Aps (4.7–6.2)

Nearby stable stars for estimating brightness (AAVSO)

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8

Size Comparison

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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

Variable Star

SRb 6.4 - 8.6p, 119d. Amp. 0.56V, 0.10(B-V), 0.26(U-B). IUE observations on Aug. 2, 1985 and Oct. 2, 1986 show slight | increase in visual mag. and decrease by 0.9 mag. in Mg II 2800.