Temperature
5785 K
5645 to 5785
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Stellar HostProfile
HD 12661
Unclassified star • 37.85 pc
Records
15
literature rows
Planets
2
system count
References
15
distinct source labels
HIP: HIP 9683TIC: TIC 118268680HD: HD 12661
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: Ghezzi et al. 2010 • System source: TICv8
Mass
1.10 Msun
1 to 1.20
Radius
1.04 Rsun
1.04 to 1.21
Age
1 Gyr
1 to 6.39
Luminosity
0.03 log(Lsun)
0.03 to 0.13
Distance
37.85 pc
single adopted value
Planets
2
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 1.04 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
HD 12661
1.04 R☉
System Layout
Known planets
2 planets linked to this host
HD 12661 b
Radial Velocity
◌
Discovery
2000
Period
262.7 days
Radius
—
Mass
772.3 M⊕
Eq. Temp
—
HD 12661 c
Radial Velocity
◌
Discovery
2002
Period
1708 days
Radius
—
Mass
575.9 M⊕
Eq. Temp
—
Two Planets Around HD 12661
HD 12661 is a K0 star located 123 light-years away. Its mass is 1.1 solar masses, its radius is 1.04 solar radii, and its temperature is 5790 K. Its age is a reported upper limit of 1 billion years. Two planets are known to orbit this star, both found by the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion.
HD 12661 b was discovered in 2000. Its minimum mass is 772 Earth masses, and its orbital period is 263 days.
HD 12661 c was discovered in 2002. Its minimum mass is 576 Earth masses, and its orbital period is 1710 days.
Both planets' minimum masses are lower bounds on their true masses. HD 12661 b's minimum mass is larger than Earth's and roughly 2.43 times Jupiter's mass, while HD 12661 c's minimum mass is larger than Earth's and roughly 1.81 times Jupiter's mass. Among the listed planets, HD 12661 b has the largest minimum mass and the shortest year by reported estimates, at 263 days. HD 12661 c has the smallest minimum mass and the longest year by reported estimates, at 1710 days. HD 12661 b's minimum mass is larger than Earth's.
Provenance
Underlying measurements and references
Evidence Summary
Rows
15
Stellar refs
14
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agedisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typestable
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| — | — | — | — | — | — | 37.85 | Valenti & Fischer 2005 | TICv8 |
| 5754 | 1.07 | 1.10 | — | — | — | 37.85 | Fischer et al. 2001 | TICv8 |
| — | 1.16 | — | — | — | — | 37.85 | An et al. 2025 | TICv8 |
| 5785 | 1.10 | 1.04 | 1 | 0.03 | — | 37.85 | Ghezzi et al. 2010 | TICv8 |
| 5655 | 1 | 1.21 | — | 0.13 | — | 37.85 | TICv8 | TICv8 |
| 5656 | — | 1.21 | — | 0.13 | — | 37.85 | Gaia DR2 | TICv8 |
| 5661.2 | 1.08 | 1.20 | — | — | — | 37.85 | Rosenthal et al. 2021 | TICv8 |
| 5702 | 1.05 | — | — | — | — | 37.85 | Santos et al. 2004 | TICv8 |
| — | — | — | — | — | K0 | 37.85 | Cannon & Pickering 1918 | TICv8 |
| — | — | — | — | — | — | 37.85 | Wright et al. 2004 | TICv8 |
| — | — | — | — | — | — | 37.85 | Nidever et al. 2002 | TICv8 |
| 5748 | 1.02 | 1.11 | 6.39 | 0.06 | — | 37.85 | Liu et al. 2014 | TICv8 |
| 5645 | 1.20 | 1.20 | — | — | — | 37.85 | Stassun et al. 2017 | TICv8 |
| — | 1.16 | — | — | — | — | 37.85 | An et al. 2025 | TICv8 |
| 5715 | 1.05 | — | — | — | — | 37.85 | Santos et al. 2003 | TICv8 |