HIP 41378

HIP 41378 is a star located 346 light-years away in the constellation of Cancer. The star has an apparent magnitude of 8.92. This F-type main sequence dwarf has a mass of 1.15 M_☉ and a radius of 1.25 R_☉. It has a surface temperature of about 6,251 K.

HIP 41378

Observation data Epoch J2000      Equinox J2000
Constellation	Cancer
Right ascension	08h 26m 27.84909s[1]
Declination	+10° 04′ 49.3342″[1]
Apparent magnitude (V)	8.92[2]
Characteristics
Evolutionary stage	Main sequence[3]
Spectral type	F8[4]
Astrometry
Radial velocity (Rv)	50.42±0.37[5] km/s
Proper motion (μ)	RA: −48.002±0.020 mas/yr[1] Dec.: 0.062±0.015 mas/yr[1]
Parallax (π)	9.4360 ± 0.0208 mas[1]
Distance	345.7 ± 0.8 ly (106.0 ± 0.2 pc)
Details
Mass	1.15+0.06 −0.05[6] M☉
Radius	1.25+0.16 −0.11[6] R☉
Surface gravity (log g)	4.28 cgs
Temperature	6,251[6] K
Metallicity [Fe/H]	0.00[6] dex
Rotational velocity (v sin i)	5.7[6] km/s
Other designations
BD+10°1799, HIP 41378, PPM 125260, YZ 10 3402, AG+10 1097, EPIC 211311380[7]
Database references
SIMBAD	data

Planetary system

In 2016, the K2 Kepler mission discovered five planets around HIP 41378, with sizes ranging from 2 times the size of Earth to the size of Jupiter, out to about 1 AU for the outermost planet.^[8] The semi-major axes were not known until K2 Haute-Provence Observatory radial velocity data was obtained in 2019. Also, a sixth non-transiting planet, HIP 41378 g, was discovered, along with speculation that additional planets may exist between HIP 41378 g and HIP 41378 d. The planet HIP 41378 f was also found to likely have optically-thick rings or a highly extended atmosphere.^[3][9]

The HIP 41378 planetary system^[3][10]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	6.89 ± 0.88 M🜨	0.1283	15.57208 ± 0.00002	0.07 ± 0.06	88.75 ± 0.13°	2.17 ± 0.28 R🜨
c	4.4 ± 1.1 M🜨	0.2161	31.706038 ± 0.00006	0.04	88.477 ± 0.06°	2.727 ± 0.06 R🜨
g	7.0 ± 1.5 M🜨	0.3227 ± 0.0036	62.06 ± 0.32	0.06	—	—
d	<4.6 M🜨	0.88 ± 0.01	278.3618 ± 0.0005	0.06 ± 0.06	89.80 ± 0.02°	3.54 ± 0.06 R🜨
e	12 ± 5 M🜨	1.06 ± 0.03	369 ± 10	0.14 ± 0.09	89.84 ± 0.07°	4.92 ± 0.09 R🜨
f	12 ± 3 M🜨	1.37 ± 0.02	542.07975 ± 0.00014	0	89.971 ± 0.01°	9.2 ± 0.1 R🜨

See also

• Planetary system

References

1. 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.
2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
3. Santerne, A.; Malavolta, L.; Kosiarek, M. R.; Dai, F.; Dressing, C. D.; Dumusque, X.; Hara, N. C.; Lopez, T. A.; Mortier, A.; Vanderburg, A.; Adibekyan, V.; Armstrong, D. J.; Barrado, D.; Barros, S. C. C.; Bayliss, D.; Berardo, D.; Boisse, I.; Bonomo, A. S.; Bouchy, F.; Brown, D. J. A.; Buchhave, L. A.; Butler, R. P.; Collier Cameron, A.; Cosentino, R.; Crane, J. D.; Crossfield, I. J. M.; Damasso, M.; Deleuil, M. R.; Delgado Mena, E.; et al. (2019). "An extremely low-density and temperate giant exoplanet". arXiv:1911.07355 [astro-ph.EP].
4. Hill, Sarah J.; Schilt, Jan (1952). "Photographic magnitudes of 55700 stars in the zones 10 deg to 20 deg and 30 deg to 50 deg". Contributions from the Rutherford Observatory of Columbia University New York. 32: 1. Bibcode:1952CoRut..32....1H.
5. 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.
6. Petigura, Erik A.; Crossfield, Ian J. M.; Isaacson, Howard; Beichman, Charles A.; Christiansen, Jessie L.; Dressing, Courtney D.; Fulton, Benjamin J.; Howard, Andrew W.; Kosiarek, Molly R.; Lépine, Sébastien; Schlieder, Joshua E.; Sinukoff, Evan; Yee, Samuel W. (2018). "Planet Candidates from K2 Campaigns 5-8 and Follow-up Optical Spectroscopy". The Astronomical Journal. 155 (1): 21. arXiv:1711.06377. Bibcode:2018AJ....155...21P. doi:10.3847/1538-3881/aa9b83. S2CID 55674757.
7. "HIP 41378". SIMBAD. Centre de données astronomiques de Strasbourg.
8. Andrew Vanderburg; et al. (2016). "Five Planets Transiting a Ninth Magnitude Star". The Astrophysical Journal. 827 (1): L10. arXiv:1606.08441. Bibcode:2016ApJ...827L..10V. doi:10.3847/2041-8205/827/1/L10. S2CID 8794583.
9. Akinsanmi, B.; Santos, N. C.; Faria, J. P.; Oshagh, M.; Barros, S. C. C.; Santerne, A.; Charnoz, S. (2020-03-01). "Can planetary rings explain the extremely low density of HIP 41378 𝑓?". Astronomy & Astrophysics. 635: L8. arXiv:2002.11422. doi:10.1051/0004-6361/202037618. ISSN 0004-6361.
10. exoplanet.eu Planet HIP 41378 g