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WASP-48
Observation data; Epoch J2000 Equinox J2000
Constellation	Cygnus
Right ascension	19h 24m 38.9616s
Declination	+55° 28′ 23.3317″
Apparent magnitude (V)	11.65±0.14
Characteristics
Spectral type	G0IV
Astrometry
Radial velocity (Rv)	-19.740 km/s
Proper motion (μ)	RA: 6.141 mas/yr ; Dec.: -27.969 mas/yr
Parallax (π)	2.1732 ± 0.0213 mas
Distance	1,500 ± 10 ly ; (460 ± 5 pc)
Details
Mass	1.19±0.04 M☉
Radius	1.75±0.07 R☉
Surface gravity (log g)	4.03±0.03 cgs
Temperature	5920±150 K
Metallicity	−0.12±0.12
Rotational velocity (v sin i)	12.2±0.7 km/s
Age	6+5; −4 Gyr
Other designations
	Gaia DR2 2141754578242371584, TYC 3925-739-1, GSC 03925-00739, 2MASS J19243895+5528233
Database references
SIMBAD	data

WASP-48 is a subgiant star about 1400 light-years away. The star is likely older than Sun and slightly depleted in heavy elements. It shows an infrared excess noise of unknown origin,^[3] yet has no detectable ultraviolet emissions associated with the starspot activity.^[4] The discrepancy may be due to large interstellar absorption of light in interstellar medium for WASP-48.^[5] The measurements are compounded by the emission from eclipsing contact binary NSVS-3071474 projected on sky plane nearby,^[6] although no true stellar companions were detected by survey in 2015.^[7]

The star is rotating rapidly, being spun up by the tides raised by the giant planet on close orbit.^[8]

Planetary system

In 2011 a transiting hot Jupiter planet b was detected.^[2]

The WASP-48 planetary system^[2]^[6]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.98±0.09 $M$ _J	0.03320±0.00077	2.143634±0.000003	0	80.09^+0.69 _−0.55°	1.396±0.051 $R$ _J

References

^ ^a ^b ^c ^d WASP-48 -- Star
^ ^a ^b ^c Enoch, B.; Anderson, D. R.; Barros, S. C. C.; Brown, D. J. A.; Collier Cameron, A.; Faedi, F.; Gillon, M.; Hébrard, G.; Lister, T. A.; Queloz, D.; Santerne, A.; Smalley, B.; Street, R. A.; Triaud, A. H. M. J.; West, R. G.; Bouchy, F.; Bento, J.; Butters, O.; Fossati, L.; Haswell, C. A.; Hellier, C.; Holmes, S.; Jehen, E.; Lendl, M.; Maxted, P. F. L.; McCormac, J.; Miller, G. R. M.; Moulds, V.; Moutou, C.; et al. (2011), "WASP-35b, WASP-48b and WASP-51b: Two new planets and an independent discovery of HAT-P-30b", The Astronomical Journal, 142 (3): 86, arXiv:1104.2827, Bibcode:2011AJ....142...86E, doi:10.1088/0004-6256/142/3/86, S2CID 63996398
^ Sada, Pedro V.; Deming, Drake; Jennings, Donald E.; Jackson, Brian k.; Hamilton, Catrina M.; Fraine, Jonathan; Peterson, Steven W.; Haase, Flynn; Bays, Kevin; Lunsford, Allen; o'Gorman, Eamon (2012), "Extrasolar Planet Transits Observed at Kitt Peak National Observatory", Publications of the Astronomical Society of the Pacific, 124 (913): 212–229, arXiv:1202.2799, Bibcode:2012PASP..124..212S, doi:10.1086/665043, S2CID 29665395
^ Shkolnik, Evgenya L. (2013), "An Ultraviolet Investigation of Activity on Exoplanet Host Stars", The Astrophysical Journal, 766 (1): 9, arXiv:1301.6192, Bibcode:2013ApJ...766....9S, doi:10.1088/0004-637X/766/1/9, S2CID 118415788
^ Fossati, L.; Marcelja, S. E.; Staab, D.; Cubillos, P. E.; France, K.; Haswell, C. A.; Ingrassia, S.; Jenkins, J. S.; Koskinen, T.; Lanza, A. F.; Redfield, S.; Youngblood, A.; Pelzmann, G. (2017), "The effect of ISM absorption on stellar activity measurements and its relevance for exoplanet studies", Astronomy & Astrophysics, 601: A104, arXiv:1702.02883, Bibcode:2017A&A...601A.104F, doi:10.1051/0004-6361/201630339, S2CID 17549819
^ ^a ^b Ciceri, S.; Mancini, L.; Southworth, J.; Bruni, I.; Nikolov, N.; d'Ago, G.; Schröder, T.; Bozza, V.; Tregloan-Reed, J.; Henning, Th. (2015), "Physical properties of the HAT-P-23 and WASP-48 planetary systems from multi-colour photometry", Astronomy & Astrophysics, 577: A54, arXiv:1503.00762, Bibcode:2015A&A...577A..54C, doi:10.1051/0004-6361/201425449, S2CID 53607610
^ Wöllert, Maria; Brandner, Wolfgang; Bergfors, Carolina; Henning, Thomas (2015), "A Lucky Imaging search for stellar companions to transiting planet host stars", Astronomy & Astrophysics, 575: A23, arXiv:1507.01938, Bibcode:2015A&A...575A..23W, doi:10.1051/0004-6361/201424091, S2CID 119250579
^ Brown, D. J. A. (2014), "Discrepancies between isochrone fitting and gyrochronology for exoplanet host stars?", Monthly Notices of the Royal Astronomical Society, 442 (2): 1844–1862, arXiv:1406.4402, Bibcode:2014MNRAS.442.1844B, doi:10.1093/mnras/stu950, S2CID 56052792