Wikipedia

HIP 41378

HIP 41378
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer[1]
Right ascension 08h 26m 27.84909s[2]
Declination +10° 04′ 49.3342″[2]
Apparent magnitude (V) 8.92[3]
Characteristics
Evolutionary stage Main sequence[2]
Spectral type F8[4]
Astrometry
Radial velocity (Rv)50.42±0.37[5] km/s
Proper motion (μ) RA: −48.002(20) mas/yr[2]
Dec.: 0.062(15) mas/yr[2]
Parallax (π)9.4360±0.0208 mas[2]
Distance345.7 ± 0.8 ly
(106.0 ± 0.2 pc)
Absolute magnitude (MV)+3.65[1]
Details
Mass1.245+0.037
−0.043[6] M☉
Radius1.299±0.002[7] R☉
Luminosity2.44[2] L☉
Surface gravity (log g)4.32±0.02[6] cgs
Temperature6,371±65 K
Metallicity [Fe/H]0.046±0.044[6] dex
Rotation7.8±1.0 d[7]
Rotational velocity (v sin i)7.5±0.5[6] km/s
Age1.8+0.7
−0.6[6] Gyr
Other designations
AG+10 1097, BD+10 1799, HIP 41378, SAO 97816, PPM 125260, K2-93, EPIC 211311380, TOI-4304, TIC 366443426, TYC 800-1325-1, YZ 10 3402[8]
Database references
SIMBADdata
Exoplanet Archivedata

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 1.245 M☉[6] and a radius of 1.299 R☉.[7] It has a surface temperature of about 6,371 K.[6]

Planetary system

[edit]

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.[9] 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.[10][11]

The stellar rotation of HIP 41378 appears to be misaligned relative to the orbit of HIP 41378 f, and thus likely the other planets' orbits as well.[7]

The HIP 41378 planetary system[a]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 9.06+1.41
−0.51 M🜨 		0.1303±0.0013 15.571893+68
−53 		0.0213+0.0022
−0.0099 		88.816+0.065
−0.061° 		2.595±0.036 R🜨
c 6.53+1.33
−0.42 M🜨 		0.2093±0.0022 31.70838+39
−41 		0.0678+0.0078
−0.0097 		88.462±0.015° 2.727±0.06 R🜨
g 6.81+1.14
−0.98 M🜨 		— 64.067+0.026
−0.067 		0.010+0.031
−0.010 		95+1
−10° 		—
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🜨

Notes

[edit]
  1. ^ HIP 41378 b's radius: Howard et al. (2025)[6]
    All other radii, and HIP 41378 d, e and f's properties: Santerne et al. (2019)[10]
    HIP 41378 g, b and c's properties: Leonardi et al. (2025)[12]

References

[edit]
  1. ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. ^ a b c d e f 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.
  3. ^ 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.
  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. ^ a b c d e f g h Howard, Andrew W.; Sinukoff, Evan; Blunt, Sarah; Petigura, Erik A.; Crossfield, Ian J. M.; Isaacson, Howard; Kosiarek, Molly; Rubenzahl, Ryan A.; Brewer, John M. (2025-02-06). "Planet Masses, Radii, and Orbits from NASA's K2 Mission". The Astrophysical Journal Supplement. 278 (2): 52. arXiv:2502.04436. Bibcode:2025ApJS..278...52H. doi:10.3847/1538-4365/adc5e4.
  7. ^ a b c d Grouffal, S.; et al. (2025). "The star HIP 41378 potentially misaligned with its cohort of long-period planets". Astronomy & Astrophysics. 701: A173. arXiv:2507.01807. Bibcode:2025A&A...701A.173G. doi:10.1051/0004-6361/202555487.
  8. ^ "HIP 41378". SIMBAD. Centre de données astronomiques de Strasbourg.
  9. ^ 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.
  10. ^ a b 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].
  11. ^ 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.
  12. ^ Leonardi, P.; et al. (2025). "Transit timing variations in HIP 41378: CHEOPS and TESS confirm a non-transiting sixth planet in the system". Astronomy & Astrophysics. 702: A211. arXiv:2509.14156. Bibcode:2025A&A...702A.211L. doi:10.1051/0004-6361/202555253.