Key parameters at a glance
- A radius of 1.44 Earth radii
- A mass of 2.67 Earth masses
- Surface gravity around 1.29 g
- An orbital period of 5.590 days
- Semi-major axis 0.0596 AU
- Equilibrium temperature 854 K (581 °C)
- Distance from Earth 152.94 light-years
- Earth Similarity Index 0.358
- Travel time at Voyager 1 speed 2,697,098 years
- Almost certainly tidally locked to its host star given the close orbit
DMPP-3 A b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#850of 1176
top 72.2%
This planet
1.44R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | DMPP-3 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.44 | 11.21 |
| Mass (M⊕) | 1.00 | 2.67 | 317.83 |
| Density (g/cm³) | 5.51 | 4.91 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.29 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 2.670 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 42936
HIP
HIP 28941
TIC
TIC 141765836
Gaia DR2
Gaia DR2 5266148569447305600
System
DMPP-3
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.59 Earth days (1.5% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0596 AU.
Eq. Temperature
854K
(581 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.358
0 = alien, 1 = Earth-identical
Insufficient insolation data — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Barnes et al. 2020Instrument
HARPS Spectrograph
Publication
2019-12
Observation locale
Ground
Discovery cohort
Planets confirmed in 2019 at La Silla Observatory (12 shown).
Host System: DMPP-3 A
Spectral Class
K-type orange
Effective Temperature
5,138 K — cooler than the Sun (5,778 K)
Estimated Age
10.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.910 R☉
Stellar Mass
0.900 M☉
Metallicity [Fe/H]
0.18
Extended Stellar Properties
Surface gravity (log g)
4.461 dex
Stellar density
1.643 g/cm³
Systemic radial velocity
-0.67 km/s
Rotational v·sin i
1.97 km/s
Rotation period
21.80 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
21.298 mas
Total Proper Motion
383.640 mas/yr
PM Right Ascension
-1.41 mas/yr
PM Declination
-383.64 mas/yr
Galactic Cartesian (pc)
x = -0.009 · y = 0.300 · z = -0.954
Equatorial (J2000)
RA 91.62435° · Dec -72.51431°
Galactic ℓ, b
283.212° · -29.145°
Ecliptic λ, β
265.307° · -84.020°
HTM-20 index
1280912498
Similar Worlds
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Super-Earth · K-type orange
Radius 1.44 R⊕ · 96.7 ly
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Kepler-1007 b
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K2-36 b
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Super-Earth · K-type orange
Radius 1.43 R⊕ · 2,627.4 ly