Key parameters at a glance

A radius of 12.80 Earth radii
A mass of 1,766.81 Earth masses
Surface gravity around 10.78 g
An orbital period of 199.680 days
Semi-major axis 0.7150 AU
Distance from Earth 328.03 light-years
Earth Similarity Index 0.435
Travel time at Voyager 1 speed 5,784,891 years

Context from the literature

HD 104985 b, also named Meztli, is an extrasolar planet approximately 97 parsecs (317 lys) from the Sun. The 198-day period planet orbits the yellow giant star HD 104985 (Tonatiuh) at a distance of 0.78 AU. With a mass 61/3 times Jupiter it is a gas giant.

Excerpted from Wikipedia · full article

HD 104985 b Planet Profile

Physical Specs

Radius

12.80 R⊕

Radius (Jupiter)

1.140 R♃

Mass

1,766.81 M⊕

Mass (Jupiter)

5.559 M♃

Density

4.63 g/cm³

Surface Gravity

10.78 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.435

HZ Position Unknown

Controversial No

Discovery

Year 2003

Method Radial Velocity

Facility Okayama Astrophysical Observatory

Telescope 1.88 m Telescope

Size rank in cohort

Rank by radius

#1063of 1771

top 60.0%

This planet

12.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 240210 b 12.80 R⊕ HD 29985 b 12.80 R⊕ HD 148164 c 12.80 R⊕

Metric	Earth	HD 104985 b	Jupiter
Radius (R⊕)	1.00	12.80	11.21
Mass (M⊕)	1.00	1,766.81	317.83
Density (g/cm³)	5.51	4.63	1.33
Surface Gravity (g)	1.00	10.78	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	1,766.808 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 104985

HIP

HIP 58952

TIC

TIC 160224839

Gaia DR2

Gaia DR2 1693159194226600192

Gaia DR3

Gaia DR3 1693159194226600192

System

HD 104985

Percentile among Gas Giant cohort

Radius 12.800 R⊕ · percentile 37 / cohort 1771

Mass 1,766.808 M⊕ · percentile 77 / cohort 1747

Orbital period 199.68 d · percentile 57 / cohort 1533

Distance 100.58 pc · percentile 35 / cohort 1759

ESI 0.435 · percentile 96 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

199.680 days

Semi-major axis

0.7150 AU

Eccentricity

0.047

Inclination

— °

Year Length

A year here lasts approximately 199.68 Earth days (54.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.7150 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.435

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Sato et al. 2003

Instrument

HIDES Echelle Spectrograph

Publication

2003-11

Observation locale

Ground

Host System: HD 104985

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,738 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

11.120 R☉

Stellar Mass

1.220 M☉

Metallicity [Fe/H]

-0.32

Extended Stellar Properties

Surface gravity (log g)

2.420 dex

Systemic radial velocity

-20.20 km/s

Metallicity ratio

[Fe/H]

Distance

100.58 parsec

Light-years 328.03 ly

V-band magnitude

5.79 mag

Voyager-speed travel 5,784,891 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

9.915 mas

Total Proper Motion

173.584 mas/yr

PM Right Ascension

147.07 mas/yr

PM Declination

-92.20 mas/yr

Galactic Cartesian (pc)

x = -0.227 · y = -0.005 · z = 0.974

Equatorial (J2000)

RA 181.31579° · Dec 76.90534°

Galactic ℓ, b

126.321° · 39.918°

Ecliptic λ, β

120.618° · 63.598°

HTM-20 index

495449973

Wikipedia →