HD 107148
Coordinates: 
12h 19m 13.4909s, −03° 19′ 11.242″
12h 19m 13.4909s, −03° 19′ 11.242″| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Virgo[1] |
| Right ascension | 12h 19m 13.491s[2] |
| Declination | −03° 19′ 11.24″[2] |
| Apparent magnitude (V) | 8.01[1] |
| Characteristics | |
| Evolutionary stage | main sequence + white dwarf |
| Spectral type | G5V[3] + DA[4] |
| B−V color index | 0.707±0.013[1] |
| Absolute magnitude (MV) | 4.47[1] |
| Position (relative to HD 107148 A)[4] | |
| Component | HD 107148 B |
Projected separation | 1,790 AU |
| Details Gyr | |
| HD 107148 B | |
| Mass | 0.6[4] M☉ |
| Temperature | 6250±250[4] K |
| Database references | |
| SIMBAD | data |
HD 107148 is a wide
apparent visual magnitude of 8.01.[1]
The brighter primary member, designated component A, has a
magnetic activity cycle with a period around 6 years.[9] It has 1.1 times the mass of the Sun and 1.15 times the Sun's radius. HD 107148 is radiating 1.34 times the luminosity of the Sun from its photosphere at an effective temperature of 5,789 K.[6]
In 2012, a comoving white dwarf stellar companion HD 107148 B was detected[10] at projected separation of 1,790 AU, and was confirmed in 2014. It is a 0.6 M☉ remnant core of the former 1.8±0.2 M☉ star with a cooling age of 2.1±0.3 Gyr. This was formerly the primary component of this system before it ejected much of its mass.[4]
Planetary system
In 2006, a discovery of Saturn-mass planet was announced.[11] Another Neptune-sized planet was discovered in 2021, together with significantly refined orbit of HD 107148 b.[9]
HD 107148 should not be confused with
extrasolar planet
discovered in 2000.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.196±0.009 MJ | 0.3692+0.0037 −0.0038 |
77.185+0.01 −0.025 |
0.15+0.02 −0.06 |
— | — |
| c | > 0.068+0.004 −0.005 MJ |
0.1415±0.0015 | 18.3270+0.0008 −0.0016 |
0.40+0.04 −0.08 |
— | — |
See also
- List of extrasolar planets
References
- ^ S2CID 119257644.
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ Bibcode:1999MSS...C05....0H.
- ^ .
- ^ S2CID 52952408.
- ^ S2CID 53971692.
- ^ , A76.
- ^ "HD 107148". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-11-12.
- ^ S2CID 235186973.
- , 102.
- S2CID 119067572.
- S2CID 246822760.
