WASP-1
{{Short description|Star in the constellation Andromeda}}
{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = Telescope photo of WASP-1
}}
{{Starbox observe
| epoch = J2000
| constell = Andromeda
}}
{{Starbox character
| component1 = WASP-1A
| type = main-sequence star
| appmag_1_passband = B
| appmag_2_passband = V
| component2 = WASP-1B
| type2 =
| class2 =
| appmag_1_passband2 = H
| appmag_2_passband2 = K
}}
{{Starbox astrometry
| component1 = WASP-1A
| radial_v = {{val|−13.90|(59)}}
| prop_mo_ra = {{val|−4.692|(22)}}
| prop_mo_dec = {{val|−3.320|(20)}}
| parallax = 2.6108
| p_error = 0.0218
| absmag_v = {{val|3.63|0.13|0.14}}
}}
{{Starbox detail
| component1 = WASP-1A
| mass = {{val|1.301|0.049|0.047}}
| radius = {{val|1.515|0.052|0.045}}
| density =
| gravity = {{val|4.190|0.020|0.022}}
| luminosity = {{val|2.88|0.36|0.30}}
| temperature = {{val|6110|75}}
| metal_fe = {{val|0.26|0.08}}
| rotation =
| age_gyr = {{val|3.0|0.6}}
| component2 = WASP-1B
| radius2 =
| density2 =
| luminosity2 =
| temperature2 = ~3400{{rp|13}}
}}
{{Starbox relpos
| epoch = 2013–2014
| primary = WASP-1A
| component = WASP-1B
| angdistsec = ~4.58
| posang = ~1.9
| projsep = {{val|1587|160|16}}
}}
{{Starbox catalog
| names = {{odlist | name=1SWASP J002040.07+315923.7 | name2=USNO-B1.0 1219-00005465 | 2MASS=J00204007+3159239 | GSC=02265-00107 | TIC=57984377 | TOI=6014 | TYC=2265-107-1 | WASP=1}}
}}
{{Starbox reference
| Simbad = WASP-1
| NSTED = WASP-1
}}
{{Starbox end}}
WASP-1 is a magnitude 12 binary star system located about {{formatnum:1250}} light-years away in the Andromeda constellation. The binary system consists of a metal-rich F-type main-sequence star, named WASP-1A, and a distant low-mass star, named WASP-1B. WASP-1A has one known transiting hot Jupiter exoplanet named WASP-1b.
Stellar companion
WASP-1A has a distant companion star, named WASP-1B. WASP-1B is a low-mass star that is around 0.3 times as massive as the Sun and has an effective temperature of about {{val|3400|u=K}}.{{rp|24}} WASP-1B is located northward of WASP-1A at an angular separation of about 4.6 arcseconds, corresponding to a projected distance of 1587 AU.{{rp|13, 15}} WASP-1B was first identified in observations from 2006 and confirmed in further observations from 2012 to 2014, which showed that it shares the proper motion of WASP-1A, indicating the two stars are gravitationally bound to each other.{{rp|15}}
Planetary system
In 2006, an extrasolar planet was discovered by the Wide Angle Search for Planets team using the transit method. 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 the rotational axis of the star by 79.0{{±|4.3|4.5}} degrees, making it a nearly "polar" orbit.{{cite journal|arxiv=1011.5664|doi=10.1111/j.1365-2966.2011.18603.x|title=The spin-orbit angles of the transiting exoplanets WASP-1b, WASP-24b, WASP-38b and HAT-P-8b from Rossiter-Mc Laughlin observations★|year=2011|last1=Simpson|first1=E. K.|last2=Pollacco|first2=D.|last3=Cameron|first3=A. Collier|last4=Hébrard|first4=G.|last5=Anderson|first5=D. R.|last6=Barros|first6=S. C. C.|last7=Boisse|first7=I.|last8=Bouchy|first8=F.|last9=Faedi|first9=F.|last10=Gillon|first10=M.|last11=Hebb|first11=L.|last12=Keenan|first12=F. P.|last13=Miller|first13=G. R. M.|last14=Moutou|first14=C.|last15=Queloz|first15=D.|last16=Skillen|first16=I.|last17=Sorensen|first17=P.|last18=Stempels|first18=H. C.|last19=Triaud|first19=A.|last20=Watson|first20=C. A.|last21=Wilson|first21=P. A.|journal=Monthly Notices of the Royal Astronomical Society|volume=414|issue=4|pages=3023–3035|doi-access=free |bibcode=2011MNRAS.414.3023S|s2cid=46522188}}
Two searches for additional planets using transit-timing variations have yielded negative results.
{{OrbitboxPlanet begin
}}
{{OrbitboxPlanet
| exoplanet = b
| mass = {{val|0.948|0.029|0.028}}
| semimajor = {{val|0.03958|0.00047|0.00049}}
| period = {{val|2.51994480|0.00000050}}
| eccentricity = {{val|0.013|p=<}}
| inclination = {{val|90.0|0.0|2.9}}
| radius = {{val|1.514|0.052|0.047}}
}}
{{Orbitbox end}}
See also
References
External links
- {{cite encyclopedia | title=Planet WASP-1 b | url=https://exoplanet.eu/catalog/wasp_1_b--346/ | encyclopedia=Extrasolar Planets Encyclopaedia | access-date=2018-11-07}}
- [http://aladin.u-strasbg.fr/AladinPreview?-c=00+20+40.077%2B31+59+23.79&ident=GSC+02265-00107&submit=Aladin+previewer Image WASP 1]
{{Sky|00|20|40|+|31|59|24|1239}}
{{Stars of Andromeda}}
{{DEFAULTSORT:WASP-1}}
Category:Andromeda (constellation)
Category:F-type main-sequence stars
Category:Planetary transit variables