Temperature
3557 K
3496 to 4117.7
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Stellar HostProfile
HD 180617
M2.5 V • 5.91 pc
Records
12
literature rows
Planets
1
system count
References
12
distinct source labels
HD: HD 180617TIC: TIC 176188045HIP: HIP 94761
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: Kaminski et al. 2018 • System source: TICv8
Mass
0.45 Msun
0.42 to 0.48
Radius
0.45 Rsun
0.45 to 0.50
Luminosity
-1.49 log(Lsun)
-1.52 to -1.49
Distance
5.91 pc
single adopted value
Spectral Type
M2.5 V
Multiple classifications reported
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.45 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
HD 180617
0.45 R☉
System Layout
Known planets
1 planets linked to this host
HD 180617 b
Radial Velocity
◌
Discovery
2018
Period
105.9 days
Radius
—
Mass
12.21 M⊕
Eq. Temp
—
HD 180617 and Its Planet
HD 180617 is an M2.5 V star, a small, cool red dwarf, lying 19.3 light-years away. Its reported mass is 0.45 solar masses, its radius is 0.453 solar radii, and its temperature is 3560 K. Each of these stellar measurements is smaller or cooler than the corresponding value for the Sun. One planet is known to orbit this host.
That planet, HD 180617 b, was discovered in 2018 by the radial velocity method, which detects the wobble a planet's gravity induces in its star's motion. Its minimum mass is 12.2 Earth masses, larger than Earth's, and its orbital period is 106 days. A minimum mass is a lower bound on the planet's true mass, distinct from an ordinary mass estimate.
Provenance
Underlying measurements and references
Evidence Summary
Rows
12
Stellar refs
11
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 3557 | 0.45 | 0.45 | — | -1.49 | M2.5 V | 5.91 | Kaminski et al. 2018 | TICv8 |
| — | — | — | — | — | M2.5 | 5.91 | Hawley et al. 1996 | TICv8 |
| 3496 | 0.42 | 0.50 | — | -1.52 | M2.5V | 5.91 | Turnbull 2015 | TICv8 |
| — | — | — | — | — | — | 5.91 | Wright et al. 2004 | TICv8 |
| — | — | — | — | — | Ma | 5.91 | Cannon & Pickering 1918 | TICv8 |
| 3534 | 0.48 | 0.48 | — | -1.49 | — | 5.91 | Burt et al. 2021 | TICv8 |
| 4117.7 | — | — | — | — | — | 5.91 | Gaia DR2 | TICv8 |
| 3499 | 0.47 | 0.47 | — | -1.52 | — | 5.91 | TICv8 | TICv8 |
| — | — | — | — | — | — | 5.91 | Nidever et al. 2002 | TICv8 |
| — | — | — | — | — | M2 III | 5.91 | Michigan Catalog, Vol. 5 | TICv8 |
| — | — | — | — | — | — | 5.91 | Duncan et al. 1991 | TICv8 |
| — | — | — | — | — | — | 5.91 | Duncan et al. 1991 | TICv8 |