54 Cassiopeiae is a star in the northern constellation Cassiopeia. Located 88 ly (27 pc) from Earth,[2] it has an apparent magnitude of 6.59,[3] which makes it hard to be seen by the naked eye even from dark skies. Its absolute magnitude is 4.4.[5] It is a F-type main-sequence star with a stellar classification F8V, currently fusing atoms of hydrogen into helium at its core.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia[1] |
| Right ascension | 02h 09m 80.26080s[2] |
| Declination | +71° 33′ 07.2268″[2] |
| Apparent magnitude (V) | +6.587[3] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | F8V[4] |
| Astrometry | |
| Radial velocity (Rv) | 0.58±0.12[2] km/s |
| Proper motion (μ) | RA: +306.91 mas/yr[2] Dec.: −239.244 mas/yr[2] |
| Parallax (π) | 37.0117 ± 0.0173 mas[2] |
| Distance | 88.12 ± 0.04 ly (27.02 ± 0.01 pc) |
| Absolute magnitude (MV) | +4.42[5] |
| Details | |
| Mass | 1.09+0.06 −0.31[6] M☉ |
| Radius | 1.061[7] R☉ |
| Luminosity | 1.411[7] L☉ |
| Surface gravity (log g) | 4.0[8] cgs |
| Temperature | 6,039[5] K |
| Metallicity [Fe/H] | +0.25[5] dex |
| Rotational velocity (v sin i) | 6[8] km/s |
| Age | 2.5[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Astrometric measurements by the Gaia spacecraft suggest the presence of a planetary companion to 54 Cassiopeiae. This planet is seven times more massive than Jupiter and orbits 54 Cassiopieae with an orbital period of 401 days (1.10 years).[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (unconfirmed) | 7.1 MJ | — | 401.1 | — | — | — |
References
edit- ^ Anderson, E.; Francis, Ch. (2012-05-01). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737.
- ^ 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.
- ^ a b Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (2004-05-01). "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ∼14 000 F and G dwarfs". Astronomy and Astrophysics. 418: 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. ISSN 0004-6361.
- ^ a b Hinkel, Natalie R.; Mamajek, Eric E.; Turnbull, Margaret C.; Osby, Ella; Shkolnik, Evgenya L.; Smith, Graeme H.; Klimasewski, Alexis; Somers, Garrett; Desch, Steven J. (2017-10-01). "A Catalog of Stellar Unified Properties (CATSUP) for 951 FGK-Stars within 30 pc". The Astrophysical Journal. 848 (1): 34. arXiv:1709.04465. Bibcode:2017ApJ...848...34H. doi:10.3847/1538-4357/aa8b0f. ISSN 0004-637X.
- ^ a b c d e Holmberg, J.; Nordström, B.; Andersen, J. (2009-07-01). "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics". Astronomy and Astrophysics. 501 (3): 941–947. arXiv:0811.3982. Bibcode:2009A&A...501..941H. doi:10.1051/0004-6361/200811191. ISSN 0004-6361.
- ^ a b c Sahlmann, Johannes; Gómez, Pablo (2024-04-14). "Machine learning-based identification of Gaia astrometric exoplanet orbits". arXiv:2404.09350 [astro-ph.EP].
- ^ a b McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. ISSN 0035-8711.
- ^ a b Latham, David W.; Stefanik, Robert P.; Torres, Guillermo; Davis, Robert J.; Mazeh, Tsevi; Carney, Bruce W.; Laird, John B.; Morse, Jon A. (2002-08-01). "A Survey of Proper-Motion Stars. XVI. Orbital Solutions for 171 Single-lined Spectroscopic Binaries". The Astronomical Journal. 124 (2): 1144–1161. Bibcode:2002AJ....124.1144L. doi:10.1086/341384. ISSN 0004-6256.
- ^ "The Extrasolar Planet Encyclopaedia — 54 Cas b". Extrasolar Planets Encyclopaedia. Paris Observatory.