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WASP-78
Observation data; Epoch J2000 Equinox J2000
Constellation	Eridanus
Right ascension	04h 15m 01.5043s
Declination	−22° 06′ 59.103″
Apparent magnitude (V)	12.0
Characteristics
Evolutionary stage	main-sequence star[citation needed]
Spectral type	F8
Astrometry
Radial velocity (Rv)	1.26 km/s
Proper motion (μ)	RA: −0.367(11) mas/yr ; Dec.: 6.395(13) mas/yr
Parallax (π)	1.3851 ± 0.0136 mas
Distance	2,350 ± 20 ly ; (722 ± 7 pc)
Details
Mass	1.33±0.09 M☉
Radius	2.20±0.12 R☉
Luminosity	5.8±0.2 L☉
Surface gravity (log g)	3.88±0.04 cgs
Temperature	6100±150 K
Metallicity [Fe/H]	-0.35±0.14 dex
Rotation	0.4±0.4
Rotational velocity (v sin i)	6.63±0.16 km/s
Age	3.4+1.5; −0.8 Gyr
Other designations
	Gaia DR2 5089851638095503616, TYC 5889-271-1, GSC 05889-00271, 2MASS J04150149-2206591
Database references
SIMBAD	data

WASP-78, is a single F-type main-sequence star about 2350 light-years away. It is likely to be younger than the Sun at 3.4^+1.5
_−0.8 billion years.^[5] WASP-78 is depleted in heavy elements, having a 45% concentration of iron compared to the Sun.

Planetary system

In 2012 a transiting hot Jupiter planet b was detected on a circular orbit. The planetary equilibrium temperature is 2350±80 K,^[2] while the nightside temperature measured in 2019 is 2200±41 K.^[6] The dayside planetary temperature measured in 2020 is 2560±130 K.^[7]

A survey in 2016 measured a Rossiter-McLaughlin effect and found the planetary orbit is well aligned with the equatorial plane of the star, misalignment equal to −6.4±5.9°^[5] The planet cannot have formed in its current orbit and has likely undergone in the past a migration from the initial highly eccentric orbit.^[8]

The WASP-78 planetary system^[2]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.89±0.08 $M$ _J	0.0362±0.0008	2.17517632±0.0000047	0	83.2^+2.3 _−1.6°	1.70±0.11 $R$ _J

References

^ ^a ^b ^c ^d 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.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Smalley, B.; Anderson, D. R.; Collier-Cameron, A.; Doyle, A. P.; Fumel, A.; Gillon, M.; Hellier, C.; Jehin, E.; Lendl, M.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smith, A. M. S.; Southworth, J.; Triaud, A. H. M. J.; Udry, S.; West, R. G. (2012), "WASP-78b and WASP-79b: Two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus", Astronomy & Astrophysics, 547: A61, arXiv:1206.1177, Bibcode:2012A&A...547A..61S, doi:10.1051/0004-6361/201219731, S2CID 119233646
^ ^a ^b "WASP-78". SIMBAD. Centre de données astronomiques de Strasbourg.
^ 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.
^ ^a ^b ^c ^d Brown, D. J. A.; Triaud, A. H. M. J.; Doyle, A. P.; Gillon, M.; Lendl, M.; Anderson, D. R.; Collier Cameron, A.; Hébrard, G.; Hellier, C.; Lovis, C.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Smalley, B. (2016), "Rossiter–McLaughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems", Monthly Notices of the Royal Astronomical Society, 464: 810–839, arXiv:1610.00600, doi:10.1093/mnras/stw2316, S2CID 53497449
^ Garhart, Emily; Deming, Drake; Mandell, Avi; Knutson, Heather A.; Wallack, Nicole; Burrows, Adam; Fortney, Jonathan J.; Hood, Callie; Seay, Christopher; Sing, David K.; Benneke, Björn; Fraine, Jonathan D.; Kataria, Tiffany; Lewis, Nikole; Madhusudhan, Nikku; McCullough, Peter; Stevenson, Kevin B.; Wakeford, Hannah (2020), "Statistical Characterization of Hot Jupiter Atmospheres Using Spitzer's Secondary Eclipses", The Astronomical Journal, 159 (4): 137, arXiv:1901.07040, Bibcode:2020AJ....159..137G, doi:10.3847/1538-3881/ab6cff, S2CID 119209434
^ Wong, Ian; Shporer, Avi; Daylan, Tansu; Benneke, Björn; Fetherolf, Tara; Kane, Stephen R.; Ricker, George R.; Vanderspek, Roland; Latham, David W.; Winn, Joshua N.; Jenkins, Jon M.; Boyd, Patricia T.; Glidden, Ana; Goeke, Robert F.; Sha, Lizhou; Ting, Eric B.; Yahalomi, Daniel (2020), "Systematic phase curve study of known transiting systems from year one of the TESS mission", The Astronomical Journal, 160 (4): 155, arXiv:2003.06407, Bibcode:2020AJ....160..155W, doi:10.3847/1538-3881/ababad, S2CID 212717799
^ Valsecchi, Francesca (2014), "Planets on the Edge", The Astrophysical Journal, 787 (1): L9, arXiv:1403.1870, Bibcode:2014ApJ...787L...9V, doi:10.1088/2041-8205/787/1/L9, S2CID 118451863