Astronomy:HIP 41378

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Short description: Star in the constellation Cancer
HIP 41378
Observation data
Equinox J2000.0]] (ICRS)
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)[2] mas/yr
Dec.: 0.062(15)[2] mas/yr
Parallax (π)9.4360 ± 0.0208[2] mas
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
BD+10 1799, HIP 41378, SAO 97816, PPM 125260, EPIC 211311380, 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

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 astronomical unit|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] In 2026, radial velocity evidence for a seventh planet, named HIP 41378 h, with an orbital period of 2,600 days was found. However, it remains uncertain if the variations are caused by a planet or a magnetic cycle.[12]

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]

Template:Orbitbox planet hypothetical
The HIP 41378 planetary system[12]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 6.9±0.5 M⊕ 0.1300±0.0009 15.57209±0.00002 0.05+0.03
−0.05 		88.847±0.048° 2.640+0.022
−0.024 R⊕
c 5.97+0.56
−0.86 M⊕ 		0.2088±0.0014 31.70591±0.00005 0.044+0.022
−0.044 		88.475±0.013° 2.740+0.043
−0.049 R⊕
g 6.81+1.14
−0.98[13] M⊕ 		0.3307±0.0023 64.067+0.026
−0.067[13] 		0.055+0.024
−0.054 		95+1
−10[13]° 		—
d 6.53+2.65
−3.15 M⊕ 		0.8885+0.0060
−0.0058 		278.3618±0.0003 0.063+0.027
−0.063 		89.789±0.005° 3.650±0.029 R⊕
e 7.6+3.2
−4.6 M⊕ 		1.1195+0.0094
−0.0110 		393+3
−5 		0.065+0.031
−0.065 		89.801±0.003° 5.19±0.04 R⊕
f 25±5 M⊕ 1.3856+0.0094
−0.0090 		542.0797±0.0001 0.052+0.025
−0.052 		89.948±0.008° 9.47±0.07 R⊕

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  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. et al. (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. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Howard, Andrew W.; Sinukoff, Evan; Blunt, Sarah; Petigura, Erik A.; Crossfield, Ian J. M.; Isaacson, Howard; Kosiarek, Molly; Rubenzahl, Ryan A. et al. (2025-02-06). "Planet Masses, Radii, and Orbits from NASA's K2 Mission". The Astrophysical Journal Supplement 278 (2): 52. doi:10.3847/1538-4365/adc5e4. Bibcode: 2025ApJS..278...52H. 
  7. ↑ 7.0 7.1 7.2 7.3 Grouffal, S. et al. (2025). "The star HIP 41378 potentially misaligned with its cohort of long-period planets". Astronomy & Astrophysics 701: A173. doi:10.1051/0004-6361/202555487. Bibcode: 2025A&A...701A.173G. 
  8. ↑ "HIP 41378". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HIP+41378. 
  9. ↑ Andrew Vanderburg (2016). "Five Planets Transiting a Ninth Magnitude Star" (in en). The Astrophysical Journal 827 (1): L10. doi:10.3847/2041-8205/827/1/L10. Bibcode: 2016ApJ...827L..10V. 
  10. ↑ 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?" (in en). Astronomy & Astrophysics 635: L8. doi:10.1051/0004-6361/202037618. ISSN 0004-6361. 
  12. ↑ 12.0 12.1 Grouffal, S.; Santerne, A.; Dumusque, X.; Akinsanmi, B.; Guillot, T.; Hara, N. C.; Leleu, A.; Malavolta, L. et al. (2026-04-24). "A decade of monitoring the HIP 41378 planetary system. Masses and orbital periods of six planets and a planet candidate". Astronomy & Astrophysics. doi:10.1051/0004-6361/202659666. ISSN 0004-6361. 
  13. ↑ 13.0 13.1 13.2 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. doi:10.1051/0004-6361/202555253. Bibcode: 2025A&A...702A.211L. 



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