Theta Aql

HIP 99473; Theta Aql; 65 Aql DoubleStar Aql Visible Level 3 Medium telescope (6-8") - Requires steady seeing

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Physical Properties

Magnitude 3.23

Spectral Type B9IV

Star Color Blue-white (B-V -0.07)

Distance 286.2 ly

Position & Identifiers

RA 20h 11m 18.3s

Dec -00° 49' 17.0"

Constellation Aql

HR 7710

HIP 99473

Bayer Theta

Flamsteed 65 Aql

Visibility

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Multiple Star System

Separation 115.8″

Companion Mag 13.0

Position Angle 259°

Star Colors A: Blue-white B: Yellow-white

Discoverer BU 1540

Eyepiece View

Telescope Eyepiece

80x Dawes: 1.9″ TFOV: 0.6°

Seeing

Scale Realistic = true angular size

Sep: 115.8″ · PA: 259° · N up, E left

Resolved · 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

Spectroscopic Binary

17.1243d, K 51.0k/s, V0 -27.9k/s, msin3i 0.742, asini 9.52.

Group/Cluster

In reflection nebula.

Survey Image

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