V1472 Aquilae

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V1472 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 20h 05m 26.54815s
Declination +15° 30′ 01.5064″
Apparent magnitude (V) 6.406
Characteristics
Spectral type M2.5III
U−B color index 1.76
B−V color index 1.64
Variable type Semiregular pulsating Star
Astrometry
Radial velocity (Rv) -111.70 ± 0.3 km/s
Proper motion (μ) RA: 36.64 ± 0.86 mas/yr
Dec.: 20.16 ± 0.78 mas/yr
Parallax (π) 2.4 ± 1.0 mas
Distance approx. 1,400 ly
(approx. 400 pc)
Absolute magnitude (MV) -2.6 ± 1.0 [1]
Details
Radius 104 ± 56[1] R
Luminosity 1100[1] L
Other designations
HD 190658, BD+15° 4040, HIP 98954, HR 7680, SAO 105663.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

V1472 Aquilae is a semi-regular pulsating star in the constellation Aquila. It is actually a binary star system, the main component being a red giant of spectral type M2.5 III. Original calculations using hipparcos data gave a parallax of 7.92 ± 1.07 milliarcseconds, but reprocessing to allow for orbital motion adjusts the parallax to 2.4 ± 1.0 milliarcseconds—tripling the system's distance from Earth. The main star has a diameter 104 ± 56 times and luminosity 1100 times that of the Sun. The stars orbit each other every 196 days.[1]

References[edit]

  1. ^ a b c d Boffin, H. M. J.; Hillen, M.; Berger, J. P.; Jorissen, A.; Blind, N.; Le Bouquin, J. B.; Mikołajewska, J.; Lazareff, B. (2014). "Roche-lobe filling factor of mass-transferring red giants: the PIONIER view". Astronomy & Astrophysics. 564: 13. Bibcode:2014A&A...564A...1B. arXiv:1402.1798Freely accessible. doi:10.1051/0004-6361/201323194. A1.