HD 107146

HD 107146

The 74 exocomet belts imaged by ALMA’s REASONS survey, showing belts of all shapes, sizes and ages (REASONS comboplot full nonames).jpg Image of the debris disk with the REASONS survey
Observation data Epoch J2000      Equinox J2000
Constellation	Coma Berenices
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	7.028
Characteristics
Spectral type	G2V
U−B Template:Engvar	+0.073
B−V Template:Engvar	+0.602
Astrometry
Radial velocity (Rv)	1.88 km/s
Proper motion (μ)	RA: -174.684 mas/yr Dec.: -149.0214 mas/yr
Parallax (π)	36.4038±0.0230 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Details
Mass	1.09 Template:Solar mass
Radius	Template:Solar radius
Luminosity	1.1 Template:Solar luminosity
Surface gravity (log g)	4.56 cgs
Temperature	K
Metallicity [Fe/H]	0.00 dex
Rotation	days
Age	80–200 myr years
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
BD+17° 2462, NLTT 30317, SAO 100038, HD 107146, HIP 60074, 2MASS J12190650+1632541
Database references
SIMBAD	data

HD 107146 is a star in the constellation Coma Berenices that is located about from Earth. The apparent magnitude of 7.028 makes this star too faint to be seen with the unaided eye.

The physical properties of this star are similar to the Sun, including the stellar classification G2V, making this a solar analog. The mass of this star is about 109% of the solar mass (Template:Solar mass) and it has about 99% the radius of the Sun (Template:Solar radius). It is a young star with an age between 80 and 200 Myr. The axis of rotation is estimated at degrees to the line of sight and it completes a rotation in a relatively brief 3.5 days.

Circumstellar disc

In 2003, astronomers recognized the excess infrared and submillimeter 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.

The star's circumstellar disc has dimensions of approximately 210 × 300 AU. The dusty ring is cool, with a temperature of , and has a dust mass of 0.250±0.004 Template:Earth mass and nearly no gas. 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. 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. An analysis published in 2009 suggests the possible presence of a planet at a separation of 45-75 AU, in the wide gap centered at 75.4 AU which may be carved by the planet, but no planet with mass exceeding 1-2 Template:Jupiter mass was observed in the gap. Template:OrbitboxPlanet begin Template:OrbitboxPlanet disk

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Gallery

• Transit of Vermin Galaxy behind HD 107146.[16]
  Transit of Vermin Galaxy behind HD 107146.
• 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.
  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.