Temperature
5790 K
5765.9 to 5855
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Stellar HostProfile
HD 187123
Unclassified star • 45.95 pc
Records
17
literature rows
Planets
2
system count
References
17
distinct source labels
HIP: HIP 97336HD: HD 187123TIC: TIC 58559140
Approximate color
from effective temperature
Canonical Summary
Adopted host values from one source row
Values come from the row with the most populated summary measurements. Missing values stay missing. Ranges and counts describe all source rows.
Stellar source: TICv8 • System source: TICv8
Mass
1.04 Msun
1 to 1.19
Radius
1.15 Rsun
1.15 to 1.17
Luminosity
0.13 log(Lsun)
0.13 to 0.13
Distance
45.95 pc
single adopted value
Planets
2
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 1.15 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
HD 187123
1.15 R☉
System Layout
Known planets
2 planets linked to this host
HD 187123 b
Radial Velocity
◌
Discovery
1998
Period
3.10 days
Radius
—
Mass
166.2 M⊕
Eq. Temp
—
HD 187123 c
Radial Velocity
◌
Discovery
2008
Period
3810 days
Radius
—
Mass
632.5 M⊕
Eq. Temp
—
HD 187123 and Its Two Known Planets
HD 187123 is a G3 V star located 150 light-years away. Its spectral type marks it as a G-type main-sequence dwarf, the same broad class as the Sun. The star is measured at 1.04 solar masses, 1.15 solar radii, and 5790 K, making its reported radius larger than the Sun's. Two planets are known to orbit this host.
HD 187123 b was discovered by radial velocity in 1998. It has a minimum mass of 166 Earth masses and an orbital period of 3.1 days. HD 187123 c, also found by radial velocity, dates to 2008. Its minimum mass is 632 Earth masses, and it takes 3810 days to complete one orbit. Among the listed planets, HD 187123 b has both the shortest year and the smallest minimum mass, while HD 187123 c has the longest year and the largest minimum mass; its minimum mass is also roughly 1.99 times Jupiter's mass.
Provenance
Underlying measurements and references
Evidence Summary
Rows
17
Stellar refs
16
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agedisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 5781.8 | — | 1.16 | — | 0.13 | — | 45.95 | Gaia DR2 | TICv8 |
| — | 1.19 | — | — | — | — | 45.95 | An et al. 2025 | TICv8 |
| — | 1.04 | — | — | — | — | 45.95 | Bryan et al. 2016 | TICv8 |
| — | 1.04 | 1.17 | 7.40 | — | — | 45.95 | Takeda et al. 2007 | TICv8 |
| 5830 | 1 | — | — | 0.13 | G3 V | 45.95 | Butler et al. 1998 | TICv8 |
| 5845 | 1.04 | — | — | — | — | 45.95 | Santos et al. 2004 | TICv8 |
| — | — | — | — | — | — | 45.95 | Nidever et al. 2002 | TICv8 |
| — | — | — | 8.91 | — | — | 45.95 | Sanz-Forcada et al. 2010 | TICv8 |
| 5790 | 1.04 | 1.15 | — | 0.13 | — | 45.95 | TICv8 | TICv8 |
| — | — | — | — | — | — | 45.95 | Wright et al. 2004 | TICv8 |
| 5855 | 1.05 | — | — | — | — | 45.95 | Santos et al. 2003 | TICv8 |
| — | — | — | — | — | — | 45.95 | Valenti & Fischer 2005 | TICv8 |
| — | — | — | — | — | G5 | 45.95 | Cannon & Pickering 1918 | TICv8 |
| 5765.9 | 1.02 | 1.15 | — | — | — | 45.95 | Rosenthal et al. 2021 | TICv8 |
| — | 1.19 | — | — | — | — | 45.95 | An et al. 2025 | TICv8 |
| — | — | — | — | — | — | 45.95 | Naef et al. 2004 | TICv8 |
| — | — | — | — | — | — | 45.95 | Nordstrom et al. 2004 | TICv8 |