Temperature
4827 K
4771 to 4977
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Stellar HostProfile
HD 40307
K3V • 12.94 pc
Records
16
literature rows
Planets
5
system count
References
17
distinct source labels
TIC: TIC 374859347HD: HD 40307HIP: HIP 27887
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: Turnbull 2015 • System source: TICv8
Mass
0.74 Msun
0.70 to 0.79
Radius
0.72 Rsun
0.65 to 0.72
Age
2.60 Gyr
2.60 to 4.50
Luminosity
-0.57 log(Lsun)
-0.64 to -0.57
Distance
12.94 pc
single adopted value
Spectral Type
K3V
Multiple classifications reported
Planets
5
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.72 R☉ • circles scaled linearly by radius
Sun
1.0 R☉ baseline
HD 40307
0.72 R☉
System Layout
Known planets
5 planets linked to this host
HD 40307 b
Radial Velocity
◌
Discovery
2009
Period
4.31 days
Radius
—
Mass
4 M⊕
Eq. Temp
—
HD 40307 c
Radial Velocity
◌
Discovery
2009
Period
9.62 days
Radius
—
Mass
6.60 M⊕
Eq. Temp
—
HD 40307 d
Radial Velocity
◌
Discovery
2009
Period
20.43 days
Radius
—
Mass
9.50 M⊕
Eq. Temp
—
HD 40307 f
Radial Velocity
◌
Discovery
2013
Period
51.76 days
Radius
—
Mass
5.20 M⊕
Eq. Temp
—
HD 40307 g
Radial Velocity
◌
Discovery
2013
Period
197.8 days
Radius
—
Mass
7.10 M⊕
Eq. Temp
—
HD 40307 and Its Five Known Planets
HD 40307 is a K3V star located 42.2 light-years from Earth. Its reported mass is 0.74 solar masses, its radius is 0.72 solar radii, and its temperature is 4830 K, making it smaller, smaller in radius, and cooler than the Sun. The star is estimated to be 2.6 billion years old. Five planets are known to orbit this host.
All five planets were detected by the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion. HD 40307 b, c, and d were announced in 2009, while HD 40307 f and g were announced in 2013. Each planet's minimum mass is a lower bound on its true mass. The minimum masses of all five planets are larger than Earth's.
HD 40307 b has a minimum mass of 4 Earth masses and an orbital period of 4.31 days, the shortest year among the listed planets. HD 40307 c has a minimum mass of 6.6 Earth masses and a period of 9.62 days, the second-shortest. HD 40307 d has a minimum mass of 9.5 Earth masses, the largest among the listed planets, and a period of 20.4 days. HD 40307 f has a minimum mass of 5.2 Earth masses, the second-smallest, and a period of 51.8 days, the second-longest. HD 40307 g has a minimum mass of 7.1 Earth masses, the second-largest, and a period of 198 days, the longest among the listed planets.
Provenance
Underlying measurements and references
Evidence Summary
Rows
16
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 |
|---|---|---|---|---|---|---|---|---|
| 4977 | 0.77 | — | — | — | K3 V | 12.94 | Díaz et al. 2016 | TICv8 |
| 4956 | 0.70 | 0.65 | 3 | -0.64 | — | 12.94 | Ghezzi et al. 2010 | TICv8 |
| 4923 | — | — | — | — | — | 12.94 | Maldonado et al. 2015 | TICv8 |
| 4827 | 0.74 | 0.72 | 2.60 | -0.57 | K3V | 12.94 | Turnbull 2015 | TICv8 |
| — | — | — | — | — | — | 12.94 | Nordstrom et al. 2004 | TICv8 |
| — | — | — | — | — | — | 12.94 | Valenti & Fischer 2005 | TICv8 |
| — | — | — | — | — | K3 V | 12.94 | Michigan Catalog, Vol. 1 | TICv8 |
| — | — | — | — | — | G5 | 12.94 | Cannon & Pickering 1918 | TICv8 |
| — | 0.74 | 0.72 | 2.60 | — | — | 12.94 | Takeda et al. 2007 | TICv8 |
| 4893 | — | 0.71 | — | -0.59 | — | 12.94 | Gaia DR2 | TICv8 |
| — | — | — | — | — | K2.5 V | 12.94 | Gray et al. 2006 | TICv8 |
| 4805 | — | — | — | — | — | 12.94 | Santos et al. 2004 | TICv8 |
| 4977 | 0.77 | — | — | -0.64 | — | 12.94 | Sousa et al. 2008 | TICv8 |
| 4771 | — | — | — | — | — | 12.94 | Tsantaki et al. 2014 | TICv8 |
| 4867.4 | 0.79 | 0.72 | — | -0.59 | — | 12.94 | TICv8 | TICv8 |
| 4956 | 0.77 | — | 4.50 | -0.64 | K2.5 V | 12.94 | Tuomi et al. 2013 | TICv8 |