HAT-P-29

HAT-P-29
Observation data; Epoch J2000 Equinox J2000
Constellation	Perseus
Right ascension	02h 12m 31.4785s
Declination	+51° 46′ 43.5621″
Apparent magnitude (V)	11.83
Characteristics
Evolutionary stage	main-sequence star
Spectral type	G
Astrometry
Radial velocity (Rv)	-21.11 km/s
Proper motion (μ)	RA: -9.805 mas/yr ; Dec.: 1.898 mas/yr
Parallax (π)	3.161 ± 0.0441 mas
Distance	1,030 ± 10 ly ; (316 ± 4 pc)
Orbit
Primary	HAT-P-29
Companion	HAT-P-29 B
Semi-major axis (a)	3.290±0.002"; (1041 AU)
Details
Mass	1.198+0.065; −0.063 M☉
Radius	1.229+0.080; −0.073 R☉
Luminosity	1.89+0.3; −0.25 L☉
Surface gravity (log g)	4.337+0.045; −0.045 cgs
Temperature	6112±88 K
Metallicity [Fe/H]	0.128+0.079; −0.080 dex
Age	2.2±1.0 Gyr
Other designations
	Muspelheim, HAT-P-29, Gaia DR2 359058441314838528, TYC 3293-1539-1, GSC 03293-01539, 2MASS J02123147+5146435
Database references
SIMBAD	data

HAT-P-29, also known as Muspelheim since 2019,^[6] is the primary of a binary star system about 1030 light-years away. It is a G-type main-sequence star. The star’s age of 2.2±1.0 billion years is less than half that of the Sun.^[5] HAT-P-29 is slightly enriched in heavy elements, having 35% more iron than the Sun.

The very faint 19-magnitude stellar companion was detected in 2016 at a projected separation of 3.290±0.002″.^[3]

Planetary system

In 2011 a transiting hot Jupiter planet b was detected on a mildly eccentric orbit.^[5] The planet was named "Surt" by Denmark in 2019.^[7]

In 2018, a transit-timing variation survey indicated additional planets with masses exceeding approximately half of Earth are absent in the system.^[4]

The HAT-P-29 planetary system^[4]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b (Surt)	0.767^+0.046 _−0.045 $M$ _J	0.0665±0.0012	5.723376±0.000021	0.073^+0.029 _−0.028	88.06^+0.78 _−0.59°	1.055^+0.079 _−0.072 $R$ _J

References

^ ^a ^b ^c ^d ^e ^f "HAT-P-29". 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 Ngo, Henry; Knutson, Heather A.; Hinkley, Sasha; Bryan, Marta; Crepp, Justin R.; Batygin, Konstantin; Crossfield, Ian; Hansen, Brad; Howard, Andrew W.; Johnson, John A.; Mawet, Dimitri; Morton, Timothy D.; Muirhead, Philip S.; Wang, Ji (2016), "FRIENDS OF HOT JUPITERS. IV. STELLAR COMPANIONS BEYOND 50 AU MIGHT FACILITATE GIANT PLANET FORMATION, BUT MOST ARE UNLIKELY TO CAUSE KOZAI-LIDOV MIGRATION", The Astrophysical Journal, 827: 8, arXiv:1606.07102, doi:10.3847/0004-637X/827/1/8, S2CID 41083068{{citation}}: CS1 maint: unflagged free DOI (link)
^ ^a ^b ^c Wang, Songhu; Wang, Xian-Yu; Wang, Yong-Hao; Liu, Hui-Gen; Hinse, Tobias C.; Eastman, Jason; Bayliss, Daniel; Hori, Yasunori; Hu, Shao-Ming; Li, Kai; Liu, Jinzhong; Narita, Norio; Peng, Xiyan; Wittenmyer, R. A.; Wu, Zhen-Yu; Zhang, Hui; Zhang, Xiaojia; Zhao, Haibin; Zhou, Ji-Lin; Zhou, George; Zhou, Xu; Laughlin, Gregory (2018), "TRANSITING EXOPLANET MONITORING PROJECT (TEMP). I. REFINED SYSTEM PARAMETERS AND TRANSIT TIMING VARIATIONS OF HAT-P-29B", The Astronomical Journal, 156 (4): 181, arXiv:1807.10107, doi:10.3847/1538-3881/aadcfc, S2CID 119415237{{citation}}: CS1 maint: unflagged free DOI (link)
^ ^a ^b ^c Buchhave, L. A.; Bakos, G. Á.; Hartman, J. D.; Torres, G.; Latham, D. W.; Andersen, J.; Kovács, G.; Noyes, R. W.; Shporer, A.; Esquerdo, G. A.; Fischer, D. A.; Johnson, J. A.; Marcy, G. W.; Howard, A. W.; Béky, B.; Sasselov, D. D.; Fűrész, G.; Quinn, S. N.; Stefanik, R. P.; Szklenár, T.; Berlind, P.; Calkins, M. L.; Lázár, J.; Papp, I.; Sári, P. (2011), "HAT-P-28b AND HAT-P-29b: TWO SUB-JUPITER MASS TRANSITING PLANETS", The Astrophysical Journal, 733 (2): 116, arXiv:1103.1813, doi:10.1088/0004-637X/733/2/116, S2CID 119293967
^ IAU100 NameExoWorlds APPROVED NAMES
^ Denmark names new planet after Norse fire giant Surt

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[simbad-1] ^ ^a ^b ^c ^d ^e ^f "HAT-P-29". SIMBAD. Centre de données astronomiques de Strasbourg.

[dr2-2] 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.

[Ngo2016-3] Ngo, Henry; Knutson, Heather A.; Hinkley, Sasha; Bryan, Marta; Crepp, Justin R.; Batygin, Konstantin; Crossfield, Ian; Hansen, Brad; Howard, Andrew W.; Johnson, John A.; Mawet, Dimitri; Morton, Timothy D.; Muirhead, Philip S.; Wang, Ji (2016), "FRIENDS OF HOT JUPITERS. IV. STELLAR COMPANIONS BEYOND 50 AU MIGHT FACILITATE GIANT PLANET FORMATION, BUT MOST ARE UNLIKELY TO CAUSE KOZAI-LIDOV MIGRATION", The Astrophysical Journal, 827: 8, arXiv:1606.07102, doi:10.3847/0004-637X/827/1/8, S2CID 41083068{{citation}}: CS1 maint: unflagged free DOI (link)

[Wang2018-4] Wang, Songhu; Wang, Xian-Yu; Wang, Yong-Hao; Liu, Hui-Gen; Hinse, Tobias C.; Eastman, Jason; Bayliss, Daniel; Hori, Yasunori; Hu, Shao-Ming; Li, Kai; Liu, Jinzhong; Narita, Norio; Peng, Xiyan; Wittenmyer, R. A.; Wu, Zhen-Yu; Zhang, Hui; Zhang, Xiaojia; Zhao, Haibin; Zhou, Ji-Lin; Zhou, George; Zhou, Xu; Laughlin, Gregory (2018), "TRANSITING EXOPLANET MONITORING PROJECT (TEMP). I. REFINED SYSTEM PARAMETERS AND TRANSIT TIMING VARIATIONS OF HAT-P-29B", The Astronomical Journal, 156 (4): 181, arXiv:1807.10107, doi:10.3847/1538-3881/aadcfc, S2CID 119415237{{citation}}: CS1 maint: unflagged free DOI (link)

[Buchhave2011-5] Buchhave, L. A.; Bakos, G. Á.; Hartman, J. D.; Torres, G.; Latham, D. W.; Andersen, J.; Kovács, G.; Noyes, R. W.; Shporer, A.; Esquerdo, G. A.; Fischer, D. A.; Johnson, J. A.; Marcy, G. W.; Howard, A. W.; Béky, B.; Sasselov, D. D.; Fűrész, G.; Quinn, S. N.; Stefanik, R. P.; Szklenár, T.; Berlind, P.; Calkins, M. L.; Lázár, J.; Papp, I.; Sári, P. (2011), "HAT-P-28b AND HAT-P-29b: TWO SUB-JUPITER MASS TRANSITING PLANETS", The Astrophysical Journal, 733 (2): 116, arXiv:1103.1813, doi:10.1088/0004-637X/733/2/116, S2CID 119293967

[6] IAU100 NameExoWorlds APPROVED NAMES

[7] Denmark names new planet after Norse fire giant Surt

[1]

[2]

[3]

[4]

[5]

[6]

[7]

Observation data Epoch J2000 Equinox J2000
Constellation	Perseus
Right ascension	02^h 12^m 31.4785^s^[1]
Declination	+51° 46′ 43.5621″^[1]
Apparent magnitude (V)	11.83
Characteristics
Evolutionary stage	main-sequence star
Spectral type	G
Astrometry

Radial velocity (R_v)	-21.11^[1] km/s
Proper motion (μ)	RA: -9.805^[1] mas/yr Dec.: 1.898^[1] mas/yr
Parallax (π)	3.161 ± 0.0441 mas^[2]
Distance	1,030 ± 10 ly (316 ± 4 pc)

Orbit^[3]
Primary	HAT-P-29
Companion	HAT-P-29 B
Semi-major axis (a)	3.290±0.002" (1041 AU)
Details^[4]

Mass	1.198^+0.065 _−0.063 `M`_☉
Radius	1.229^+0.080 _−0.073 `R`_☉
Luminosity	1.89^+0.3 _−0.25 `L`_☉
Surface gravity (log g)	4.337^+0.045 _−0.045 cgs
Temperature	6112±88 K
Metallicity [Fe/H]	0.128^+0.079 _−0.080 dex
Age	2.2±1.0^[5] Gyr

Other designations
Muspelheim, HAT-P-29, Gaia DR2 359058441314838528, TYC 3293-1539-1, GSC 03293-01539, 2MASS J02123147+5146435^[1]
Database references
SIMBAD	data