HD 203473 b

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Coordinates: Sky map 21h 22m 18.87s, +05° 01′ 24.92″

HD 203473 b
An artist's impression of HD 203473 b orbiting its host star.
An artist's impression of HD 203473 b orbiting its host star.
Discovery[1]
Discovered byMent et al.
Discovery siteHawaii W.M. Keck Observatory in Hawaii
Discovery date2018
Doppler spectroscopy
Orbital characteristics[1]
Aphelion3.52 AU (527,000,000 km)
Perihelion1.94 AU (290,000,000 km)
2.73 ± 0.17 AU (408,000,000 ± 25,000,000 km)[2]
Eccentricity0.29±0.01
1,553±3 d
2,463,333.6±9.1 JD
18.0°±1.1°
Semi-amplitude134±2 km/s
Physical characteristics
Mass≥7.8±1.1 MJ[1][2]
Temperature137.3 K (−212.5 °F; −135.8 °C)[3]

HD 203473 b is an exoplanet orbiting the G-type main sequence star HD 203473 approximately 237 light years[4] in the constellation Equuleus.

Discovery[]

The planet, along with others were discovered by scientist at the W.M. Keck Observatory in 2018 using Doppler spectroscopy. The paper states that the planets observed are "cold Jupiters", which orbit far away from their hosts.

Properties[]

Since the planet was detected with radial velocity, properties such as its inclination, radius, density, and volume are unknown. HD 203473 b takes about 4 years to orbit its host star at a separation of 2.73 AU. Like most long-period planets, HD 203473 has an eccentric orbit, carrying it as far as 3.52 AU, and close as 1.94. Assuming from its high mass, HD 203473 is certainly a gas giant with no solid surface.

See also[]

References[]

  1. ^ a b c Ment, Kristo; Fischer, Debra A.; Bakos, Gaspar; Howard, Andrew W.; Isaacson, Howard (2018-11-01). "Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810". The Astronomical Journal. 156 (5): 213. arXiv:1809.01228. Bibcode:2018AJ....156..213M. doi:10.3847/1538-3881/aae1f5. ISSN 0004-6256. S2CID 119243619.
  2. ^ a b Viswanath, Gayathri; Narang, Mayank; Manoj, P.; Mathew, Blesson; Kartha, Sreeja S. (2020-05-01). "A Statistical Search for Star-Planet Interaction in the Ultraviolet Using GALEX". The Astronomical Journal. 159 (5): 194. arXiv:2003.03349. Bibcode:2020AJ....159..194V. doi:10.3847/1538-3881/ab7d3b. ISSN 0004-6256. S2CID 212628609.
  3. ^ "HD 203473 b". www.exoplanetkyoto.org. Retrieved 2021-07-14.
  4. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
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