Key parameters at a glance
- A radius of 4.04 Earth radii
- A mass of 15.37 Earth masses
- Surface gravity around 0.94 g
- An orbital period of 74.200 days
- Semi-major axis 0.3000 AU
- Distance from Earth 88.61 light-years
- Earth Similarity Index 0.541
- Travel time at Voyager 1 speed 1,562,552 years
Context from the literature
BD−11 4672 is a single star with a pair of orbiting exoplanets in the southern constellation of Scutum, the shield. The designation BD−11 4672 comes from the Bonner Durchmusterung star catalogue, which was published during the nineteenth century in Germany. With an apparent visual magnitude of 9.99, the star is much too faint to be viewed with the naked eye. It is located at a distance of 89 light-years from the Sun, as determined from parallax, but is drifting closer with a radial velocity of −87.5 km/s. This was recognised as a high proper motion star by German astronomer Max Wolf in 1924 and is traversing the celestial sphere at an angular rate of 0.401 arcsec yr−1.
Excerpted from Wikipedia · full article
1 sibling around BD-11 4672
BD-11 4672 c 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 |
|---|---|---|---|---|---|---|
| BD-11 4672 c this | Neptune-like | 4.04 | 15.37 | 74.200 | — | 2020 |
| BD-11 4672 b | Gas Giant | 14.10 | 206.59 | 1,634.000 | — | 2014 |
BD-11 4672 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#561of 574
top 97.6%
This planet
4.04R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | BD-11 4672 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.04 | 11.21 |
| Mass (M⊕) | 1.00 | 15.37 | 317.83 |
| Density (g/cm³) | 5.51 | 1.28 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.94 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 15.370 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 90979
TIC
TIC 217831699
Gaia DR2
Gaia DR2 4154598526336121600
Gaia DR3
Gaia DR3 4154598526336121600
System
BD-11 4672
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 74.20 Earth days (20.3% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.3000 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.541
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Barbato et al. 2020Instrument
HARPS-N Spectrograph
Publication
2020-09
Observation locale
Ground
Discovery cohort
Planets confirmed in 2020 at Roque de los Muchachos Observatory (2 shown).
Host System: BD-11 4672
Spectral Class
K-type orange
Effective Temperature
4,550 K — cooler than the Sun (5,778 K)
Estimated Age
7.40 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.639 R☉
Stellar Mass
0.651 M☉
Metallicity [Fe/H]
-0.35
Extended Stellar Properties
Surface gravity (log g)
4.642 dex
Stellar density
3.530 g/cm³
Systemic radial velocity
-87.30 km/s
Rotational v·sin i
1.00 km/s
Rotation period
25.00 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
36.781 mas
Total Proper Motion
372.522 mas/yr
PM Right Ascension
-288.59 mas/yr
PM Declination
-235.56 mas/yr
Galactic Cartesian (pc)
x = 0.143 · y = -0.969 · z = -0.202
Equatorial (J2000)
RA 278.36887° · Dec -11.63705°
Galactic ℓ, b
20.543° · -1.360°
Ecliptic λ, β
278.363° · 11.560°
HTM-20 index
1674453784
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