HD 202628

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HD 202628
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Microscopium
Right ascension 21h 18m 27.269s
Declination −43° 20′ 04.75″
Apparent magnitude (V) +6.75
Characteristics
Spectral type G2V[1]
Astrometry
Distance 79.5 ly
(24.4 pc)
Details
Mass M
Radius R
Luminosity 11.5 (x-ray)[1] L
Surface gravity (log g) cgs
Temperature K
Metallicity ?
Age 2.3 ± 1 × 109[1] years
Other designations
HIP 105184, GJ 825.2, SAO 230622, LTT 2380
Database references
SIMBAD data
Exoplanet Archive data
Extrasolar Planets
Encyclopaedia
data

HD 202628 is a G-type star in the constellation Microscopium with an elliptical (e=0.18) dust disc, inclined at 64◦. The inner edge of the ring, which lies at around 158 AU from the star, is sharply defined.[1] This means that there is a likely planet responsible for this defined edge, and it has been calculated as orbiting between 86 and 158 AU from HD 202628.[2]

The HD 202628 planetary system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(years)
Eccentricity Inclination Radius
b (unconfirmed) > 1 M 86-158[2] ~ 0.2
Disk 150–220 AU

References[edit]

  1. ^ a b c d John E. Krist, Karl R. Stapelfeldt, Geoffrey Bryden, Peter Plavchan (2012), "Hubble Space Telescope Observations of the HD 202628 Debris Disk", Astronomical Journal, arXiv:1206.2078, Bibcode:2012AJ....144...45K, doi:10.1088/0004-6256/144/2/45 
  2. ^ a b Nesvold, Erika R.; Kuchner, Marc J. (2015). "Gap Clearing by Planets in a Collisional Debris Disk". The Astrophysical Journal 798: 10. arXiv:1410.7784. Bibcode:2015ApJ...798...83N. doi:10.1088/0004-637X/798/2/83. 83.