HAT-P-17

K-type main sequence star in the constellation Cygnus

HAT-P-17
Observation data Epoch J2000 Equinox J2000
Constellation	Cygnus^[1]
Right ascension	21^h 38^m 08.7310^s^[2]
Declination	+30° 29′ 19.446″^[2]
Apparent magnitude (V)	10.38^[3]
Characteristics
Spectral type	early K^[4]
Astrometry

Proper motion (μ)	RA: −80.280(16) mas/yr^[2] Dec.: −127.037(15) mas/yr^[2]
Parallax (π)	10.8195 ± 0.0182 mas^[2]
Distance	301.5 ± 0.5 ly (92.4 ± 0.2 pc)

Details

Mass	0.857±0.039 `M`_☉
Radius	0.837 `R`_☉
Luminosity	0.48±0.04 `L`_☉
Surface gravity (log g)	4.53±0.02^[5] cgs
Temperature	5345±70^[5] K
Metallicity	0.06±0.08^[5]
Rotational velocity (v sin i)	0.56+0.12 −0.14^[6] km/s
Age	7.8±3.3 Gyr

Other designations
TYC 2717-417-1, GSC 02717-00417, 2MASS J21380873+3029193^[7]
Database references
SIMBAD	data

HAT-P-17 is a K-type main-sequence star about 92.4 parsecs (301 ly) away. It has a mass of about 0.857 ± 0.039 M_☉. It is the host of two planets, HAT-P-17b and HAT-P-17c, both discovered in 2010.^[4]^[8] A search for a binary companion star using adaptive optics at the MMT Observatory was negative.^[9] A candidate companion was detected by a spectroscopic search of high-resolution K band infrared spectra taken at the Keck observatory.^[10]

Planetary system

In 2010 a multi-planet system consisting of a transiting hot Saturn in an eccentric orbit and a Jupiter like planet in an outer orbit was detected. The transiting planet HAT-P-17b was detected by the HATNet Project using telescopes located in Hawaii, Arizona and at Wise Observatory in Israel. It was confirmed with radial velocity measurements taken at the Keck telescope which also led to the discovery of the second planet on a much wider orbit.^[4] In 2013 radial velocity measurements of the Rossiter-McLaughlin effect showed that the sky-projected angle between the stellar spin axis and the orbit of planet b was approximately 19°.^[6] The measurement in 2022 have resulted in slightly larger misalignment of 26.3±6.7°^[11]

The HAT-P-17 planetary system^[4]^[12]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.537±0.017 M_J	0.0882+0.0013 −0.0014	10.338523+0.000088 −0.000089	0.3417±0.0036	89.20+0.20 −0.10°	1.010±0.029 R_J
c	> 2.88±0.10 M_J	4.67±0.14	3972+185 −146	0.295±0.021	—	—

References

^ 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
^ ^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.
^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
^ ^a ^b ^c ^d Howard, A. W.; et al. (2012). "HAT-P-17b,c: A Transiting, Eccentric, Hot Saturn and a Long-period, Cold Jupiter". The Astrophysical Journal. 749 (2). 134. arXiv:1008.3898. Bibcode:2012ApJ...749..134H. doi:10.1088/0004-637X/749/2/134. S2CID 119309100.
^ ^a ^b ^c Torres, Guillermo; et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal. 757 (2). 161. arXiv:1208.1268. Bibcode:2012ApJ...757..161T. doi:10.1088/0004-637X/757/2/161. S2CID 16580774.
^ ^a ^b Fulton, Benjamin J.; et al. (2013). "The Stellar Obliquity and the Long-period Planet in the HAT-P-17 Exoplanetary System". The Astrophysical Journal. 772 (2). 80. arXiv:1301.6289. Bibcode:2013ApJ...772...80F. doi:10.1088/0004-637X/772/2/80. S2CID 7836597.
^ "HAT-P-17". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-24.
^ "Open Exoplanet Catalogue - HAT-P-17 b". www.openexoplanetcatalogue.com. Retrieved 2020-01-10.
^ Adams, E. R.; et al. (2013). "Adaptive Optics Images. II. 12 Kepler Objects of Interest and 15 Confirmed Transiting Planets". The Astronomical Journal. 146 (1). 9. arXiv:1305.6548. Bibcode:2013AJ....146....9A. doi:10.1088/0004-6256/146/1/9. S2CID 119117620.
^ Piskorz, Danielle; et al. (2015). "Friends of Hot Jupiters. III. An Infrared Spectroscopic Search for Low-mass Stellar Companions". The Astrophysical Journal. 814 (2). 148. arXiv:1510.08062. Bibcode:2015ApJ...814..148P. doi:10.1088/0004-637X/814/2/148. S2CID 11525988.
^ Mancini, L.; et al. (2022), "The GAPS Programme at TNG", Astronomy & Astrophysics, 664: A162, arXiv:2205.10549, doi:10.1051/0004-6361/202243742, S2CID 248986121
^ 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.

Constellation of Cygnus

List of stars in Cygnus

Stars

Bayer	α (Deneb) β (Albireo) γ (Sadr) δ (Fawaris) ε (Aljanah) ζ η θ ι¹ ι² κ λ μ ν ξ o¹ o² ο³ π¹ (Azelfafage) π² ρ σ τ υ φ χ ψ ω¹ ω² P Q
Flamsteed	2 4 8 9 15 16 (c) 17 20 (d) 22 23 26 (e) 27 (b¹) 28 (b²) 29 (b³) 33 35 39 41 47 52 55 56 57 59 (f¹) 61 63 (f²) 68 (A) 71 (g) 72 74 75
Variable	R T W X Y RW SS SU TT AZ BC BI CH KY V380 V389 V404 V476 V1027 V1057 V1143 V1191 V1334 V1489 V1500 V1668 V1794 V1974 V2214 V2513
HR	7633 7767 7912 8193
HD	185269 185435 187123 188753 191806 197037
Gliese	777 806 1245
Kepler	2 3 5 6 11 15 16 17 18 22 23 27 28 29 31 32 33 34 35 36 39 40 41 42 43 44 45 47 51 56 61 63 64 (PH1) 66 67 68 69 70 78 80 84 86 (PH2) 87 89 107 167 182 186 223 289 371 385 411 419 432 445 451 452 560 737 1229 1520 1625 1649 1708
WR	133 134 135 136 137 138a 140 142 147 148 150
Other	AFGL 2591 BD+40° 4210 BD+43 3654 Cygnus OB2 #8A Cygnus OB2 #12 Cygnus X-1 Cygnus X-3 G79.29+0.46 G 208-44 G 208-45 GSC 03949-00967 HAT-P-17 KELT-9 KELT-20 KIC 8462852 KIC 9832227 KIC 11026764 KIC 11145123 KOI-5 KOI-74 KOI-81 KOI-256 MWC 349 N6946-BH1 PSR J2032+4127 SPECULOOS-3 W75N(B)-VLA2 WASP-48 WISE J2000+3629 Wolf 1069

Star
clusters

Association	Cygnus OB2 Cygnus OB7 Cygnus OB9
Open	Berkeley 86 DR 6 IC 5146 Messier 29 Messier 39 NGC 6811 NGC 6819 NGC 6834 NGC 6866 NGC 6871 NGC 6910

Molecular
clouds

Cygnus X (including DR 21)

Nebulae

Dark	Barnard 146 Barnard 147 IC 5146 L1014
H II	NGC 6914 North America Nebula Pelican Nebula Sadr Region Sh2-101 Sh2-106
Planetary	Abell 78 Egg Nebula IRAS 19475+3119 IRAS 20324+4057 Kronberger 61 M1-92 NGC 6826 NGC 6881 NGC 6884 NGC 7008 NGC 7026 NGC 7027 NGC 7048 Soap Bubble Nebula
WR	Crescent Nebula
SNR	Cygnus Loop (including Veil Nebula)

Galaxies

NGC	6801 6946 7013
Other	3C 438 4C +48.48 Cygnus A ZTF J203349.8+322901.1

Exoplanets

Kepler	2b 3b 3c 5b 6b 11b 15b 16b 17b 22b 23b 28b 32b 33b 34b 36b 39b 40b 41b 47b 56b 61b 64b (PH1b) 68b 69b 70b 78b 87c 186b e f 371b c 409b 419b 432b 451b 452b 560b 737b 1229b 1520b 1625b 1652b 1658b 1649b c 1708b
Other	b³ Cygni b HD 185269 b HD 187123 b c HD 191806 b KELT-9b KELT-20b TrES-5b