Y Sextantis

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Y Sextantis

Possible architecture for Y Sextantis' multiple system
Observation data
J2000.0
Constellation
Sextans
Right ascension 10h 02m 47.96897s[1]
Declination +01° 05′ 40.1839″
Apparent magnitude (V) 9.88[2] (10.08 + 12.70)[3]
Characteristics
Spectral type F3/5V[4] or F5/6V[5]
B−V color index 0.479±0.072[2]
Variable type W UMa[6]
Distance
approx. 1,300 ly
(approx. 390 pc)
Details[5]
A
Mass1.471±0.040 M☉
Radius1.568±0.019 R☉
Luminosity4.305±0.528 L☉
Temperature6,650±163 K
B
Mass0.287±0.020 M☉
Radius0.795±0.017 R☉
Luminosity0.979±0.134 L☉
Temperature6,448±153 K
HIP 49217, WDS J10028+0106[7]
Database references
SIMBADdata

Y Sextantis, abbreviated as Y Sex, is a

light years from the Sun based on parallax.[1]

A visual band light curve for Y Sextantis, plotted from ASAS data[8]

The variability of this system was first announced by

eclipsing binary system.[9][10] Observations of the light variations up until 1979 were used by G. Hill to generate orbital properties, providing an orbital inclination of 76.8°±0.3°.[11]

This is a

substellar
.

Perturbing third (and fourth?) body

Orbital period variations suggest the presence of one more perturbing unseen object.

substellar
.

The Y Sextantis planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
C
 (unconfirmed) 		≥240 (0.24
Solar masses) MJ
 49.0±3.9 ≈18695 — — —
b
 (unconfirmed) 		≥43 MJ 58.9±6.7 ≈11716 — — —

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    S2CID 119257644
    .
  3. ^
    doi:10.1093/mnras/staa3753
    .
  4. Bibcode:1999MSS...C05....0H
    .
  5. ^
    S2CID 118240946
    .
  6. ^
    doi:10.1093/pasj/59.6.1115
    .
  7. ^ "Y Sex". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-04-08.
  8. ^ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 8 December 2021.
  9. doi:10.1086/111526
    .
  10. doi:10.1086/108355
    .
  11. Bibcode:1979PDAO...15..297H
    .
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