Key parameters at a glance

A radius of 6.88 Earth radii
A mass of 37.90 Earth masses
Surface gravity around 0.80 g
An orbital period of 676.800 days
Semi-major axis 1.5430 AU
Distance from Earth 150.33 light-years
Earth Similarity Index 0.390
Travel time at Voyager 1 speed 2,651,027 years

5 siblings around HD 34445

HD 34445 f shares its host star with 5 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 34445 e	Neptune-like	4.26	16.80	49.175	—	2017
HD 34445 d	Neptune-like	6.07	30.70	117.870	—	2017
HD 34445 c	Neptune-like	8.42	53.50	214.670	—	2017
HD 34445 f this	Neptune-like	6.88	37.90	676.800	—	2017
HD 34445 b	Gas Giant	13.90	260.62	1,049.000	—	2009
HD 34445 g	Gas Giant	13.60	120.60	5,700.000	—	2017

HD 34445 f Planet Profile

Physical Specs

Radius

6.88 R⊕

Radius (Jupiter)

0.613 R♃

Mass

37.90 M⊕

Mass (Jupiter)

0.119 M♃

Density

0.64 g/cm³

Surface Gravity

0.80 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.390

HZ Position Unknown

Controversial No

Discovery

Year 2017

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#215of 574

top 37.3%

This planet

6.88R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-799 b 6.88 R⊕ HATS-38 b 6.88 R⊕ KIC 3558849 b 6.90 R⊕

Metric	Earth	HD 34445 f	Jupiter
Radius (R⊕)	1.00	6.88	11.21
Mass (M⊕)	1.00	37.90	317.83
Density (g/cm³)	5.51	0.64	1.33
Surface Gravity (g)	1.00	0.80	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	37.900 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 34445

HIP

HIP 24681

TIC

TIC 284907742

Gaia DR2

Gaia DR2 3241295308714904960

Gaia DR3

Gaia DR3 3241295308714904960

System

HD 34445

Percentile among Neptune-like cohort

Radius 6.880 R⊕ · percentile 62 / cohort 574

Mass 37.900 M⊕ · percentile 60 / cohort 574

Orbital period 676.80 d · percentile 96 / cohort 524

Distance 46.09 pc · percentile 14 / cohort 572

ESI 0.390 · percentile 71 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

676.800 days

Semi-major axis

1.5430 AU

Eccentricity

0.031

Inclination

— °

Year Length

A year here lasts about 1.85 Earth years on a nearly circular orbit at a mean orbital distance of 1.5430 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.390

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Vogt et al. 2017

Instrument

Multiple Instruments

Publication

2017-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2017 at Multiple Observatories (12 shown).

GJ 625 b · Super-Earth TRAPPIST-1 e · Rocky Terrestrial TRAPPIST-1 f · Rocky Terrestrial TRAPPIST-1 g · Rocky Terrestrial TRAPPIST-1 h · Rocky Terrestrial HD 34445 e · Neptune-like BD+03 2562 b · Gas Giant HD 111591 b · Gas Giant HD 34445 d · Neptune-like MOA-2012-BLG-006L b · Gas Giant HD 76920 b · Gas Giant HD 40956 b · Gas Giant

Host System: HD 34445

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,836 K — hotter than the Sun (5,778 K)

Estimated Age

8.50 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.380 R☉

Stellar Mass

1.070 M☉

Metallicity [Fe/H]

0.14

Extended Stellar Properties

Surface gravity (log g)

4.210 dex

Stellar density

0.467 g/cm³

Systemic radial velocity

-79.04 km/s

Rotational v·sin i

2.70 km/s

Rotation period

22.00 days

Activity index (log R'HK)

-5.040

Metallicity ratio

[Fe/H]

Distance

46.09 parsec

Light-years 150.33 ly

V-band magnitude

7.31 mag

Voyager-speed travel 2,651,027 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

21.668 mas

Total Proper Motion

146.999 mas/yr

PM Right Ascension

-0.81 mas/yr

PM Declination

-147.00 mas/yr

Galactic Cartesian (pc)

x = 0.182 · y = 0.975 · z = 0.128

Equatorial (J2000)

RA 79.42075° · Dec 7.35272°

Galactic ℓ, b

195.039° · -17.022°

Ecliptic λ, β

79.094° · -15.687°

HTM-20 index

2057180744