54 Cancri is a star in the zodiac constellation of Cancer. It has an apparent visual magnitude of 6.38,[2] which places it just below the normal brightness limit of stars visible to the naked eye. The annual parallax shift is 24.79 mas as measured from Earth's orbit, which yields a distance estimate of about 132 light years. It is moving away from the Sun with a radial velocity of +45 km/s.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 51m 01.4644s[1] |
| Declination | +15° 21′ 02.364″[1] |
| Apparent magnitude (V) | 6.38[2] |
| Characteristics | |
| Spectral type | G5 V-IV[3] or G1V[4] |
| B−V color index | 0.629±0.020[2] |
| Astrometry | |
| Radial velocity (Rv) | +45.098±0.032[2] km/s |
| Proper motion (μ) | RA: −112.475[1] mas/yr Dec.: +75.099[1] mas/yr |
| Parallax (π) | 24.79 ± 0.33 mas[1] |
| Distance | 132 ± 2 ly (40.3 ± 0.5 pc) |
| Absolute magnitude (MV) | 3.39[2] |
| Details[2] | |
| Mass | 1.23±0.05 M☉ |
| Radius | 1.81±0.20 R☉ |
| Luminosity | 3.72+0.55 −0.48 L☉ |
| Surface gravity (log g) | 4.04±0.04 cgs |
| Temperature | 5,862±15 K |
| Rotational velocity (v sin i) | 3.10±0.56 km/s |
| Age | 5.0+0.7 −0.4 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Measurement of the stars proper motion over time suggest changes due to an acceleration component, which may indicate it is a close binary system.[5] The visible component has a stellar classification of G5 V,[3] indicating it is an ordinary G-type main-sequence star that is generating energy through hydrogen fusion in its core region. Hall et al. (2007) classify it as a low-activity variable star.[3] The star is about five billion years old with a projected rotational velocity of 3.1 km/s. It has 1.23 times the mass of the Sun and 1.81 times the Sun's radius.[2]
References
edit- ^ a b c d e Gaia Collaboration; et al. (November 2016), "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties", Astronomy & Astrophysics, 595: 23, arXiv:1609.04172, Bibcode:2016A&A...595A...2G, doi:10.1051/0004-6361/201629512, S2CID 1828208, A2.
- ^ a b c d e f g h Niedzielski, A.; et al. (January 2016), "The Penn State - Toruń Centre for Astronomy Planet Search stars", Astronomy & Astrophysics, 585: 14, arXiv:1407.4956, Bibcode:2016A&A...585A..73N, doi:10.1051/0004-6361/201527362, A73.
- ^ a b c Hall, Jeffrey C.; et al. (March 2007), "The Activity and Variability of the Sun and Sun-like Stars. I. Synoptic Ca II H and K Observations", The Astronomical Journal, 133 (3): 862–881, Bibcode:2007AJ....133..862H, doi:10.1086/510356.
- ^ a b "54 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-09.
- ^ Mason, Brian D.; et al. (1999), "Speckle Interferometry of New and Problem HIPPARCOS Binaries", The Astronomical Journal, 117 (4): 1890−1904, Bibcode:1999AJ....117.1890M, doi:10.1086/300823.