Beta Scuti

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β Scuti
Location of β Scuti (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Scutum
Right ascension 18h 47m 10.474s[1]
Declination −04° 44′ 52.342″[1]
Apparent magnitude (V) 4.22[2]
Characteristics
Evolutionary stage Giant star
Spectral type G4IIa[3]
U−B color index +0.84[4]
B−V color index +1.09[4]
Distance
670 ± 50 ly
(210 ± 10 pc)[1]
Absolute magnitude (MV)−2.99[5]
Argument of periastron
(ω)
(secondary)		33.9°
Details
Rotational velocity (v sin i)
7.8[9] km/s
SAO
 142618, CCDM 18472-0445
Database references
SIMBADdata

Beta Scuti,

light years from the Sun
.

Characteristics

This is a

spectroscopic binary with an orbital period of 2.3 years and eccentricity around 0.35.[10] The secondary is about 3.3 magnitudes dimmer than the primary and estimated as type B9 based on the flux of far-ultraviolet radiation.[11]

The primary component has an

milliarcseconds by the Navy Precision Optical Interferometer, which gives it a physical radius of approximately 49 R☉ at the estmated distance.[7]

The secondary was directly detected with a magnitude difference of 3.6 at a separation of about 17 milli-arcseconds using observations from the Navy Precision Optical Interferometer.[12] This detection was significant as observations with the Hubble Space Telescope which indicated a companion star was present were not definitive.[13] With an orbit and a parallax the sum of the masses of the two stars can be determined via a dynamical parallax.[14] This eventually can yield a precise mass for the evolved giant primary star.

Beta Scuti was a latter designation of 6 Aquilae.[15]

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. Bibcode:1999A&A...352..495M
  3. ^
    doi:10.1086/191373
    .
  4. ^
    Bibcode:2002yCat.2237....0D
    .
  5. ^
    S2CID 119257644. Vizier catalog entry
  6. S2CID 120199240
    .
  7. ^
    ISSN 0004-6256.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  8. S2CID 119258214
    .
  9. doi:10.1051/aas:1999401. Vizier catalog entry
  10. S2CID 119387088
    .
  11. doi:10.1086/313152
    .
  12. S2CID 118803592
    .
  13. doi:10.1086/427853
    .
  14. ISBN 978-90-277-0886-1. {{cite book}}: |journal= ignored (help
    )
  15. S2CID 118445625
    .
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