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HD 50554 is a single,[7] Sun-like[8] star with an exoplanetary companion in the northern constellation of Gemini. It has an apparent visual magnitude of +6.84,[2] 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 102 light-years from the Sun based on parallax, but is drifting closer with a radial velocity of −4 km/s.[1]

HD 50554
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Gemini
Right ascension 06h 54m 42.82623s[1]
Declination +24° 14′ 44.0090″[1]
Apparent magnitude (V) +6.84[2]
Characteristics
Spectral type F8V[3]
B−V color index 0.582±0.008[2]
Astrometry
Radial velocity (Rv)−3.96±0.15[1] km/s
Proper motion (μ) RA: −35.915[1] mas/yr
Dec.: −96.881[1] mas/yr
Parallax (π)32.0570 ± 0.0567 mas[1]
Distance101.7 ± 0.2 ly
(31.19 ± 0.06 pc)
Absolute magnitude (MV)4.46[2]
Details
Mass1.06±0.03[4] M☉
Radius1.07±0.03[4] R☉
Luminosity1.37±0.01[4] L☉
Surface gravity (log g)4.4±0.04[4] cgs
Temperature6,036±52[4] K
Metallicity [Fe/H]0.05±0.06[5] dex
Rotational velocity (v sin i)2.3[5] km/s
Age3.3±1.4 Gyr[4]
2.1±1.6[5] Gyr
Other designations
BD+24°1451, GC 9043, HD 50554, HIP 33212, SAO 78855, GSC 01894-01961[6]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

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 activity[9] 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]

In 2001, a giant planet was announced by the European Southern Observatory, who used the radial velocity method.[10][9] The discovery was confirmed in 2002 using observations from the lick and keck telescopes.[3] 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]

The HD 50554 planetary system[11]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >4.46 ± 0.48 MJ 2.28 ± 0.13 1,224 ± 12 0.444 ± 0.038 — —
Disk 45 AU — —

See also



References


  1. 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.
  2. 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. S2CID 119257644.
  3. 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.
  4. 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.
  5. 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.
  6. "HD 50554". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-24.
  7. 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.
  8. 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. 183.
  9. 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.
  10. "Exoplanets: The Hunt Continues!" (Press release). Garching, Germany: European Southern Observatory. April 4, 2001. Retrieved December 27, 2012.
  11. Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. S2CID 119067572.


На других языках

[de] HD 50554

HD 50554 ist ein etwa 98 Lichtjahre von der Erde entfernter, sonnenähnlicher Stern im Sternbild Zwillinge mit einer scheinbaren Helligkeit von ca. 6,8 mag. Im Jahre 2002 entdeckten Vogt et al. mit Hilfe der Radialgeschwindigkeitsmethode einen Exoplaneten-Kandidaten, der diesen Stern mit einer Periode von 1224 Tagen umkreist. Das Objekt mit der systematischen Bezeichnung HD 50554 b hat eine Mindestmasse von rund 5 Jupitermassen. Die große Halbachse der Umlaufbahn misst ca. 2,3 Astronomische Einheiten, ihre Exzentrizität 0,44.
- [en] HD 50554

[ru] HD 50554

HD 50554 — одиночная звезда в созвездии Близнецов на расстоянии приблизительно 102 световых лет (около 31 парсека) от Солнца. Видимая звёздная величина звезды — +6,86m. Возраст звезды определён как около 2,16 млрд лет[8].


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