Menu

Sigma Aql

Observable Variable Star Excellent (63/100)

Range: 5.2 - 5.4, Period: 2.0d, Type: EB

HIP 96665; Sigma Aql; 44 Aql VariableStar Aql Visible Level 3 Medium telescope (6-8") - Monitor brightness changes
Star Map Add to List Add to Plan
Back to Catalog

Physical Properties

Magnitude 5.17
Variable Type Eclipsing Binary (Beta Lyrae-type)
Spectral Type B3V+B3V
Star Color White (B-V 0.03)

Position & Identifiers

RA 19h 39m 11.6s
Dec +05° 23' 52.0"
Constellation Aql
HR 7474
HIP 96665
Bayer Sigma
Flamsteed 44 Aql
Variable ID Sig Aql
Double Cat 12737

Visibility

Set a location in User Settings to see visibility data.

Comparison Stars

Nearby stable stars for estimating brightness (AAVSO)

Loading comparison stars…

Multiple Star System

Components 3
Component IDs AB
Separation 48.0″
Companion Mag 12.3
Companion Sp B3V
Position Angle 327°
Star Colors A: White B: Blue
Discoverer HJ 2886

Eyepiece View

80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 327° A (5.2) B (12.3)

Sep: 48.0″ · PA: 327° · N up, E left

Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″

Size Comparison

Querying VizieR for stellar data…

Stellar Lifecycle

Spectral Classification

Hertzsprung-Russell Diagram

Loading HR diagram…

Blackbody Spectrum

Stellar Absorption Spectrum

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

Stellar Notes

ADS 12737A, EB 5.18 - 5.36B, 1.95026827d. i 71.7d. Spectra vary in period 1.950271d.
B, 12v K0Ve at 48" optical. C, 12v at 130". Rotational velocity of A 123k/s, of B 142k/s.
ADS 12737A, 1.950271d, K 164.2k/s, V0 -4.5k/s, msin3i 5.84, asini 4.40. vsini of secondary 129k/s.

Survey Image

Loading survey image…