| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 54m 42.82615s[1] |
| Declination | +24° 14′ 44.0057″[1] |
| Apparent magnitude (V) | +6.84[2] |
| Characteristics | |
| Spectral type | F8V[3] |
| B−Vcolor index | 0.582±0.008[2] |
| Astrometry | |
| Radial velocity (Rv) | −3.77±0.13[1] km/s |
| Proper motion (μ) | RA: −35.839mas/yr[1] Dec.: −96.668mas/yr[1] |
| Parallax (π) | 32.1855±0.0242 mas[1] |
| Distance | 101.34 ± 0.08 ly (31.07 ± 0.02 pc) |
| Absolute magnitude (MV) | 4.46[2] |
| Details | |
| Mass | 1.06±0.03[4] M☉ |
| Radius | 1.07±0.03[4] R☉ |
| Luminosity | 1.37±0.01[4] L☉ |
| Surface gravity (log g) | 4.4±0.04[4] cgs |
| Temperature | 6,036±52[4] K |
| Metallicity [Fe/H] | 0.05±0.06[5] dex |
| Rotational velocity (v sin i) | 2.3[5] km/s |
| Age | 3.3±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 | |
| SIMBAD | data |
HD 50554 is a single,[7] Sun-like[8]star with anexoplanetary companion in the northernconstellation ofGemini. It has anapparent visual magnitude of +6.84,[2] which makes it a 7thmagnitude star; it is not visible to thenaked eye, but can be viewed withbinoculars or atelescope. The system is located at a distance of 101light-years (31parsecs) from theSun based onparallax, but is drifting closer with aradial velocity of −4 km/s.[1]
This is a yellow-white huedF-type main-sequence star with astellar classification of F8V.[3] Age estimates put it at around 2–3 billion years old. It has a Sun-likemetallicity a low level ofchromospheric activity[9] and is spinning with aprojected 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 itsphotosphere at aneffective temperature of 6,036 K.[4]
In 2001, agiant planet was announced by theEuropean Southern Observatory, who used theradial velocity method.[10][9] The discovery was formally published in 2002 using observations from theLick andKeck telescopes.[3] In 2023, the inclination and true mass of HD 50554 b were determined viaastrometry.[11]
Aninfrared excess indicates adebris disk is orbiting the star at a distance of45 AU with a half-width of4 AU. This may be an analog of theKuiper 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 (years) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 5.85+0.9 −0.52 MJ | 2.339+0.03 −0.029 | 3.39+0.02 −0.023 | 0.482+0.015 −0.015 | 61±12 or119±12° | — |
| Disk | 45AU | — | — | |||
