Key parameters at a glance
- A radius of 12.70 Earth radii
- A mass of 1,970.54 Earth masses
- Surface gravity around 12.22 g
- An orbital period of 302.800 days
- Semi-major axis 0.9200 AU
- Distance from Earth 56.48 light-years
- Earth Similarity Index 0.441
- Travel time at Voyager 1 speed 996,096 years
Context from the literature
Iota Horologii b, often catalogued HR 810 b, is an extrasolar planet approximately 56.5 light-years away in the constellation of Horologium. Iota Horologii b has a minimum mass 2.26 times that of Jupiter; astrometric measurements from Gaia suggest it has a true mass of 6.2 MJ.
Excerpted from Wikipedia · full article
HR 810 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1130of 1771
top 63.7%
This planet
12.70R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HR 810 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.70 | 11.21 |
| Mass (M⊕) | 1.00 | 1,970.54 | 317.83 |
| Density (g/cm³) | 5.51 | 5.29 | 1.33 |
| Surface Gravity (g) | 1.00 | 12.22 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,970.536 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 721.474 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 17051
HIP
HIP 12653
TIC
TIC 166853853
Gaia DR2
Gaia DR2 4745373133284418816
Gaia DR3
Gaia DR3 4745373133284418816
System
HR 810
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 302.80 Earth days (82.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.9200 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
57.100 m/s
Transit mid-time (BJD)
2,451,908.6000
Long. of periastron (ω)
309.00°
Angular separation (arcsec)
53.10000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.441
0 = alien, 1 = Earth-identical
Detection Signatures
Radial velocity
Stellar wobble has been measured spectroscopically.
Astrometry
Positional wobble of the host star was measured.
Discovery Paper
Primary reference
Kurster et al. 2000Instrument
CES Spectrograph
Publication
2000-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 1999 at La Silla Observatory (4 shown).
Host System: HR 810
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
6,167 K — hotter than the Sun (5,778 K)
Estimated Age
2.72 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.130 R☉
Stellar Mass
1.340 M☉
Metallicity [Fe/H]
0.16
Extended Stellar Properties
Surface gravity (log g)
4.460 dex
Stellar density
1.050 g/cm³
Systemic radial velocity
17.01 km/s
Rotational v·sin i
6.50 km/s
Rotation period
7.90 days
Activity index (log R'HK)
-4.650
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
57.714 mas
Total Proper Motion
399.518 mas/yr
PM Right Ascension
333.83 mas/yr
PM Declination
219.49 mas/yr
Galactic Cartesian (pc)
x = 0.480 · y = 0.412 · z = -0.775
Equatorial (J2000)
RA 40.64172° · Dec -50.79935°
Galactic ℓ, b
268.806° · -58.323°
Ecliptic λ, β
8.235° · -61.014°
HTM-20 index
1676531791
Observation Record
Photometric series
1
RV measurements
4
Archive notes
1
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