Temperature
5361 K
5168 to 5361
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Stellar HostProfile
Kepler-1721
Unclassified star • 641.4 pc
Records
10
literature rows
Planets
1
system count
References
11
distinct source labels
TIC: TIC 164527535
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: Q1-Q12 KOI Table • System source: TICv8
Mass
0.89 Msun
0.85 to 0.89
Radius
0.80 Rsun
0.71 to 0.80
Distance
641.4 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.80 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
Kepler-1721
0.80 R☉
System Layout
Known planets
1 planets linked to this host
Kepler-1721 b
Transit
◌
Discovery
2021
Period
4.59 days
Radius
3.12 R⊕
Mass
—
Eq. Temp
—
Kepler-1721 b: A Neptune-like World in a Distant System
Kepler-1721 is a star located 2090 light-years away, with a mass of 0.889 solar masses and a radius of 0.799 solar radii. Its reported mass estimate is smaller than the Sun's, and its temperature of 5360 K is cooler than the Sun's. One planet orbits this host.
That planet is Kepler-1721 b, a Neptune-like world discovered in 2021 by the transit method, in which a planet passes in front of its star from our viewpoint and causes a small dip in observed brightness. Repeated dips help establish orbital periods. Kepler-1721 b completes an orbit every 4.59 days and has a radius of 3.12 Earth radii, a figure larger than Earth's radius. This size falls within the Neptune-like class, which extends to 4 times Earth's radius.
Provenance
Underlying measurements and references
Evidence Summary
Rows
10
Stellar refs
10
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositystable
Surface Gravitydisputed
Metallicitydisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 5187 | — | 0.71 | — | — | — | 641.4 | Latham et al. 2005 | TICv8 |
| 5361 | 0.89 | 0.80 | — | — | — | 641.4 | Q1-Q12 KOI Table | TICv8 |
| — | — | — | — | — | — | 641.4 | Q1-Q17 DR25 Supplemental KOI Table | TICv8 |
| 5351 | 0.89 | 0.80 | — | — | — | 641.4 | Q1-Q17 DR25 KOI Table | TICv8 |
| 5168 | 0.87 | 0.78 | — | -0.41 | — | 641.4 | TICv8 | TICv8 |
| 5361 | 0.89 | 0.80 | — | — | — | 641.4 | Q1-Q16 KOI Table | TICv8 |
| 5321 | 0.85 | 0.75 | 0.70 | — | — | 641.4 | Q1-Q8 KOI Table | TICv8 |
| 5187 | — | 0.76 | — | — | — | 641.4 | Q1-Q6 KOI Table | TICv8 |
| 5361 | 0.89 | 0.80 | — | — | — | 641.4 | Q1-Q17 DR24 KOI Table | TICv8 |
| 5187 | — | 0.76 | — | — | — | 641.4 | Batalha et al. 2013 | TICv8 |