| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Gemini1 |
| Right ascension | 06h 54m 42.82615s2 |
| Declination | +24° 14′ 44.0057″2 |
| Apparent magnitude (V) | +6.841 |
| Characteristics | |
| Evolutionary stage | main sequence2 |
| Spectral type | F8V3 |
| B−V color index | 0.582±0.0081 |
| Astrometry | |
| Radial velocity (Rv) | −3.77±0.132 km/s |
| Proper motion (μ) | RA: −35.839 mas/yr2 Dec.: −96.668 mas/yr2 |
| Parallax (π) | 32.1855±0.0242 mas2 |
| Distance | 101.34 ± 0.08 ly (31.07 ± 0.02 pc) |
| Absolute magnitude (MV) | 4.461 |
| Details | |
| Mass | 1.06±0.034 M☉ |
| Radius | 1.07±0.034 R☉ |
| Luminosity | 1.37±0.014 L☉ |
| Surface gravity (log g) | 4.4±0.044 cgs |
| Temperature | 6,036±524 K |
| Metallicity [Fe/H] | 0.05±0.065 dex |
| Rotational velocity (v sin i) | 2.35 km/s |
| Age | 3.3±1.4 Gyr4 2.1±1.65 Gyr |
| Other designations | |
| BD+24°1451, GC 9043, HD 50554, HIP 33212, SAO 78855, GSC 01894-019616 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 50554 is a single,7 Sun-like8 star with an exoplanetary companion in the northern constellation of Gemini. It has an apparent visual magnitude of +6.84,1 which makes it a 7th magnitude star; it is not visible to the naked eye, but can be viewed with binoculars or a telescope. The system is located at a distance of 101 light-years (31 parsecs) from the Sun based on parallax, but is drifting closer with a radial velocity of −4 km/s.2
This is a yellow-white hued F-type main-sequence star with a stellar classification of F8V.3 Age estimates put it at around 2–3 billion years old. It has a Sun-like metallicity a low level of chromospheric activity9 and is spinning with a projected rotational velocity of 2.3 km/s.5 The star has a slightly higher mass and larger radius than the Sun. It is radiating 137% of the luminosity of the Sun from its photosphere at an effective temperature of 6,036 K.4
Planetary system
In 2001, a giant planet was announced by the European Southern Observatory, who used the radial velocity method.109 The discovery was formally published in 2002 using observations from the Lick and Keck telescopes.3 In 2023, the inclination and true mass of HD 50554 b were determined via astrometry.11 Two more inner planet candidates, both super-Earths, have been detected by TESS; they were validated by a 2026 study.12
An infrared excess indicates a debris disk is orbiting the star at a distance of 45 AU with a half-width of 4 AU. This may be an analog of the Kuiper belt at an earlier stage of its evolution, which suggests a Neptune-like planet could be orbiting at its inner edge.8
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| c12 | <5.3 M🜨 | 0.066+0.009 −0.018 |
5.969362(20) | — | — | 1.31±0.06 R🜨 |
| d12 | <10.4 M🜨 | 0.168+0.028 −0.065 |
28.06940(40) | — | — | 1.41+0.14 −0.09 R🜨 |
| b11 | 5.85+0.9 −0.52 MJ |
2.339+0.03 −0.029 |
1,238+7 −8 |
0.482±0.015 | 61±12 or 119±12 | — |
| Disk8 | 45 AU | — | — | |||
References
References
- 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.
- 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.
- Fischer, Debra A.; et al. (2002). "Planetary Companions to HD 136118, HD 50554, and HD 106252". Publications of the Astronomical Society of the Pacific. 114 (795): 529–535. Bibcode:2002PASP..114..529F. doi:10.1086/341677. JSTOR 10.1086/341677.
- Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
- Chavero, C.; et al. (August 2019). "Emerging trends in metallicity and lithium properties of debris disc stars". Monthly Notices of the Royal Astronomical Society. 487 (3, p.3162-3177): 3162–3177. arXiv:1905.12066. Bibcode:2019MNRAS.487.3162C. doi:10.1093/mnras/stz1496. S2CID 168169634.
- "HD 50554". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-24.
- Baines, Ellyn K.; et al. (July 2010). "Ruling Out Possible Secondary Stars to Exoplanet Host Stars Using the CHARA Array". The Astronomical Journal. 140 (1): 167–176. arXiv:1005.2930. Bibcode:2010AJ....140..167B. doi:10.1088/0004-6256/140/1/167. S2CID 14038146.
- Dodson-Robinson, Sarah E.; et al. (December 2016). "Herschel Observations and Updated Spectral Energy Distributions of Five Sunlike Stars with Debris Disks". The Astrophysical Journal. 833 (2): 11. arXiv:1610.01173. Bibcode:2016ApJ...833..183D. doi:10.3847/1538-4357/833/2/183. S2CID 118685442. 183.
- Perrier, C.; et al. (2003). "The ELODIE survey for northern extra-solar planets. I. Six new extra-solar planet candidates". Astronomy and Astrophysics. 410 (3): 1039–1049. arXiv:astro-ph/0308281. Bibcode:2003A&A...410.1039P. doi:10.1051/0004-6361:20031340. S2CID 6946291.
- "Exoplanets: The Hunt Continues!" (Press release). Garching, Germany: European Southern Observatory. April 4, 2001. Retrieved December 27, 2012.
- Xiao, Guang-Yao; Liu, Yu-Juan; et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics. 23 (5): 055022. arXiv:2303.12409. Bibcode:2023RAA....23e5022X. doi:10.1088/1674-4527/accb7e. S2CID 257663647.
- Liu, Quanyi; Zhu, Wei; Gan, Tianjun; Dai, Fei (February 2026). "TESS planets in known radial velocity cold Jupiter systems: Hot super Earth occurrence is enhanced by cold Jupiters". The Astronomical Journal. arXiv:2602.11017.