HD 107146

HD 107146 is a star in the constellation Coma Berenices that is located about 90 light-years (28 pc) from Earth.^[10] The apparent magnitude of 7.028 makes this star too faint to be seen with the unaided eye.

HD 107146

Image of the debris disk with the REASONS survey[1]
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Coma Berenices
Right ascension	12h 19m 06.50230s[2]
Declination	16° 32′ 53.8628″[2]
Apparent magnitude (V)	7.028[3]
Characteristics
Spectral type	G2V[4]
U−B color index	+0.073[3]
B−V color index	+0.602[3]
Astrometry
Radial velocity (Rv)	1.88[5] km/s
Proper motion (μ)	RA: -174.684[6] mas/yr Dec.: -149.0214[6] mas/yr
Parallax (π)	36.4038±0.0230 mas[6]
Distance	89.59 ± 0.06 ly (27.47 ± 0.02 pc)
Details
Mass	1.09[7] M☉
Radius	0.993±0.014[7] R☉
Luminosity	1.1[8] L☉
Surface gravity (log g)	4.56[9] cgs
Temperature	5850[7] K
Metallicity [Fe/H]	0.00[9] dex
Rotation	3.50±1.35 days[7]
Age	80–200 myr[10] years
Other designations
BD+17° 2462, NLTT 30317, SAO 100038, HD 107146, HIP 60074, 2MASS J12190650+1632541[4]
Database references
SIMBAD	data

The physical properties of this star are similar to the Sun, including the stellar classification G2V,^[4] making this a solar analog.^[11] The mass of this star is about 109% of the solar mass (M_☉) and it has about 99% the radius of the Sun (R_☉).^[7] It is a young star with an age between 80 and 200 Myr.^[10] The axis of rotation is estimated at 21+8
−9 degrees to the line of sight and it completes a rotation in a relatively brief 3.5 days.^[7]

Circumstellar disc

In 2003, astronomers recognized the excess infrared^[12] and submillimeter^[10] emission indicative of circumstellar dust, the first time such a debris disk phenomenon was noted around a star of similar spectral types to the Sun, though having a much younger age. In 2004 the Hubble Space Telescope detected the presence of a spatially resolved disk surrounding the star.^[8][13]

The star's circumstellar disc has dimensions of approximately 210 × 300 AU.^[10] The dusty ring is cool, with a temperature of 51 K (−222 °C; −368 °F), and has a dust mass of 0.250±0.004 M_🜨 and nearly no gas.^[14] Analysis of the debris disk in the far-infrared and submillimeter wavelengths, carried out using the Hubble Space Telescope, suggests the presence of small grains in the disk.^[8] The disk appears to be slightly elongated to form an ellipse with its minor axis at a position angle of 58° ± 5°; working under the assumption that the disk is in fact circular gives it an inclination of 25° ± 5° from the plane of the sky.^[8] An analysis published in 2009 suggests the possible presence of a planet at a separation of 45-75 AU,^[11] in the wide gap centered at 75.4 AU^[14] which may be carved by the planet, but no planet with mass exceeding 1-2 M_J was observed in the gap.^[15]

The planetary system^[14]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
Debris disk	46.6–135.6 AU				19.3±1.0°	—

Gallery

• 
  Transit of Vermin Galaxy behind HD 107146.^[16]
• 
  False colour image of HD 107146 taken by the Hubble Space Telescope, showing its circumstellar disc. The right side of the disc is brighter due to inclination of the disc to the line of sight and preferential forward scattering of the light from the star.