Key parameters at a glance
- A radius of 4.06 Earth radii
- A mass of 15.50 Earth masses
- Surface gravity around 0.94 g
- An orbital period of 11.724 days
- Semi-major axis 0.0920 AU
- Distance from Earth 41.47 light-years
- Earth Similarity Index 0.539
- Travel time at Voyager 1 speed 731,285 years
- Almost certainly tidally locked to its host star given the close orbit
Context from the literature
HD 190007, also known as Gliese 775, is a star with a close orbiting exoplanet in the constellation of Aquila. Parallax measurements by Gaia put the star at a distance of 41.5 light-years away from the Sun. It is drifting closer with a radial velocity of −30.3 km/s, and is predicted to come within 11.8 light-years in 375,000 years. The star has an absolute magnitude of 6.91, but at its present distance the apparent visual magnitude is 7.46, which is too faint to be viewed with the naked eye.
Excerpted from Wikipedia · full article
HD 190007 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#554of 574
top 96.3%
This planet
4.06R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HD 190007 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.06 | 11.21 |
| Mass (M⊕) | 1.00 | 15.50 | 317.83 |
| Density (g/cm³) | 5.51 | 1.27 | 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) | 15.500 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 190007
HIP
HIP 98698
TIC
TIC 345217789
Gaia DR2
Gaia DR2 4247023886053586304
Gaia DR3
Gaia DR3 4247023886053586304
System
HD 190007
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.72 Earth days (3.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0920 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.539
0 = alien, 1 = Earth-identical
Insufficient insolation data. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Burt et al. 2021Instrument
Multiple Instruments
Publication
2021-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2020 at Multiple Observatories (12 shown).
Host System: HD 190007
Spectral Class
K-type orange
Effective Temperature
4,610 K — cooler than the Sun (5,778 K)
Estimated Age
1.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.790 R☉
Stellar Mass
0.770 M☉
Metallicity [Fe/H]
0.16
Extended Stellar Properties
Surface gravity (log g)
4.580 dex
Stellar density
3.253 g/cm³
Systemic radial velocity
-30.47 km/s
Rotational v·sin i
2.55 km/s
Rotation period
28.63 days
Activity index (log R'HK)
-4.650
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
78.624 mas
Total Proper Motion
149.780 mas/yr
PM Right Ascension
-90.29 mas/yr
PM Declination
119.51 mas/yr
Galactic Cartesian (pc)
x = 0.510 · y = -0.858 · z = 0.058
Equatorial (J2000)
RA 300.69563° · Dec 3.32670°
Galactic ℓ, b
44.300° · -14.222°
Ecliptic λ, β
303.683° · 23.248°
HTM-20 index
1841854385
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