WASP-1

WASP-1 is a metal-rich magnitude 12 star located about 1,250 light-years away^[2] in the Andromeda constellation.^[6]

WASP-1

The star WASP-1.
Observation data Epoch J2000      Equinox J2000
Constellation	Andromeda[1]
Right ascension	00h 20m 40.0746s[2]
Declination	+31° 59′ 23.955″[2]
Apparent magnitude (V)	11.68 ± 0.05[3]
Characteristics
Spectral type	F7V[4]
Apparent magnitude (B)	~12.0[5]
Apparent magnitude (V)	11.68 ± 0.05[3]
Astrometry
Radial velocity (Rv)	−13.90(59)[2] km/s
Proper motion (μ)	RA: −4.692(22) mas/yr[2] Dec.: −3.320(20) mas/yr[2]
Parallax (π)	2.6108 ± 0.0218 mas[2]
Distance	1,250 ± 10 ly (383 ± 3 pc)
Absolute magnitude (MV)	3.63+0.13 −0.14[3]
Details[3]
Mass	1.301+0.049 −0.047 M☉
Radius	1.515+0.052 −0.045 R☉
Luminosity	2.88+0.36 −0.30 L☉
Surface gravity (log g)	4.190+0.020 −0.022 cgs
Temperature	6110±75 K
Metallicity [Fe/H]	0.26±0.08 dex
Age	3.0±0.6 Gyr
Other designations
1SWASP J002040.07+315923.7, USNO-B1.0 1219-00005465, Gaia DR2 2862548428079638912, TYC 2265-107-1, GSC 02265-00107, 2MASS J00204007+3159239[5]
Database references
SIMBAD	data

Planetary system

In 2006, an extrasolar planet was discovered by the Wide Angle Search for Planets team using the transit method.^[4] The planet has a density of 0.31 to 0.40 g/cm³, making it about half as dense as Saturn, and one third as dense as water. The orbit of WASP-1b is inclined to rotational axis of the star by 79.0^+4.3
_−4.5 degrees, making it a nearly "polar" orbit.^[7]

Two searches for additional planets using transit-timing variations have yielded negative results.^[8][9]

The WASP-1 planetary system^[10]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.948+0.029 −0.028 MJ	0.03958+0.00047 −0.00049	2.51994480±0.00000050	<0.013	90.0+0.0 −2.9°	1.514+0.052 −0.047 RJ

See also

• SuperWASP
• List of extrasolar planets

References

1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
2. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
3. Torres, Guillermo; Winn, Joshua N.; Holman, Matthew J. (2008). "Improved Parameters for Extrasolar Transiting Planets". The Astrophysical Journal. 677 (2): 1324–1342. arXiv:0801.1841. Bibcode:2008ApJ...677.1324T. doi:10.1086/529429. S2CID 12899134.
4. Cameron, A. Collier; et al. (2007). "WASP-1b and WASP-2b: two new transiting exoplanets detected with SuperWASP and SOPHIE". Monthly Notices of the Royal Astronomical Society. 375 (3): 951–957. arXiv:astro-ph/0609688. Bibcode:2007MNRAS.375..951C. doi:10.1111/j.1365-2966.2006.11350.x. S2CID 735515.
5. "TYC 2265-107-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-05-20.
6. Stempels, H. C.; et al. (2007). "WASP-1: a lithium- and metal-rich star with an oversized planet". Monthly Notices of the Royal Astronomical Society. 379 (2): 773–778. arXiv:0705.1677. Bibcode:2007MNRAS.379..773S. doi:10.1111/j.1365-2966.2007.11976.x. S2CID 17565024.
7. Simpson, E. K.; Pollacco, D.; Cameron, A. Collier; Hébrard, G.; Anderson, D. R.; Barros, S. C. C.; Boisse, I.; Bouchy, F.; Faedi, F.; Gillon, M.; Hebb, L.; Keenan, F. P.; Miller, G. R. M.; Moutou, C.; Queloz, D.; Skillen, I.; Sorensen, P.; Stempels, H. C.; Triaud, A.; Watson, C. A.; Wilson, P. A. (2011). "The spin-orbit angles of the transiting exoplanets WASP-1b, WASP-24b, WASP-38b and HAT-P-8b from Rossiter-Mc Laughlin observations★". Monthly Notices of the Royal Astronomical Society. 414 (4): 3023–3035. arXiv:1011.5664. Bibcode:2011MNRAS.414.3023S. doi:10.1111/j.1365-2966.2011.18603.x. S2CID 46522188.
8. Granata, V.; et al. (2014). "TASTE IV: Refining ephemeris and orbital parameters for HAT-P-20b and WASP-1b". Astronomische Nachrichten. 335 (8): 797–803. arXiv:1405.3288. Bibcode:2014AN....335..797G. doi:10.1002/asna.201412072. S2CID 118341059.
9. Maciejewski, G.; et al. (2014). "Revisiting Parameters for the WASP-1 Planetary System" (PDF). Acta Astronomica. 64 (1): 11–26. arXiv:1402.6518. Bibcode:2014AcA....64...27M.
10. Bonomo, A. S.; et al. (2017). "The GAPS Programme with HARPS-N at TNG . XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy and Astrophysics. 602. A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID 118923163.

External links

• "Planet WASP-1 b". Extrasolar Planets Encyclopaedia. Retrieved 2018-11-07.
• Image WASP 1