Key parameters at a glance
- A radius of 13.30 Earth radii
- A mass of 724.62 Earth masses
- Surface gravity around 4.10 g
- An orbital period of 2,880.000 days
- Semi-major axis 3.3900 AU
- Distance from Earth 1,682.37 light-years
- Earth Similarity Index 0.376
- Travel time at Voyager 1 speed 29,668,617 years
1 sibling around NN Ser
NN Ser d shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| NN Ser d this | Gas Giant | 13.30 | 724.62 | 2,880.000 | — | 2010 |
| NN Ser c | Gas Giant | 12.60 | 2,329.60 | 6,987.000 | — | 2010 |
Circumbinary planet
NN Ser d orbits a binary-star pair rather than a single host — a minority architecture in the confirmed catalogue.
NN Ser d Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#793of 1771
top 44.7%
This planet
13.30R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | NN Ser d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.30 | 11.21 |
| Mass (M⊕) | 1.00 | 724.62 | 317.83 |
| Density (g/cm³) | 5.51 | 1.69 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.10 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 724.622 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 696.044 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
TIC
TIC 172608008
Gaia DR2
Gaia DR2 1191504471436192512
Gaia DR3
Gaia DR3 1191504471436192512
System
NN Ser
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 7.89 Earth years on a mildly elliptical path at a mean orbital distance of 3.3900 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.376
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Beuermann et al. 2010Instrument
Multiple Instruments
Publication
2010-10
Observation locale
Ground
Host System: NN Ser
Spectral Class
O-type blue giant
Effective Temperature
57,000 K — hotter than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
—
Stellar Mass
0.535 M☉
Metallicity [Fe/H]
—
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.917 mas
Total Proper Motion
66.460 mas/yr
PM Right Ascension
-30.09 mas/yr
PM Declination
-59.26 mas/yr
Galactic Cartesian (pc)
x = -0.513 · y = -0.829 · z = 0.223
Equatorial (J2000)
RA 238.23370° · Dec 12.91209°
Galactic ℓ, b
23.653° · 45.339°
Ecliptic λ, β
232.607° · 32.321°
HTM-20 index
1993512865