Key parameters at a glance

A radius of 12.50 Earth radii
A mass of 3,257.74 Earth masses
Surface gravity around 20.85 g
An orbital period of 1,276.460 days
Semi-major axis 2.5133 AU
Distance from Earth 43.72 light-years
Earth Similarity Index 0.380
Travel time at Voyager 1 speed 771,047 years

2 siblings around ups And

ups And d shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
ups And b	Gas Giant	14.00	218.53	4.617	—	1996
ups And c	Gas Giant	12.30	4,443.24	241.258	—	1999
ups And d this	Gas Giant	12.50	3,257.74	1,276.460	—	1999

ups And d Planet Profile

Physical Specs

Radius

12.50 R⊕

Radius (Jupiter)

1.110 R♃

Mass

3,257.74 M⊕

Mass (Jupiter)

10.250 M♃

Density

9.17 g/cm³

Surface Gravity

20.85 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.380

HZ Position Unknown

Controversial No

Discovery

Year 1999

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1235of 1771

top 69.7%

This planet

12.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 156279 c 12.50 R⊕ HD 33283 b 12.50 R⊕ HD 156279 b 12.50 R⊕

Metric	Earth	ups And d	Jupiter
Radius (R⊕)	1.00	12.50	11.21
Mass (M⊕)	1.00	3,257.74	317.83
Density (g/cm³)	5.51	9.17	1.33
Surface Gravity (g)	1.00	20.85	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3,257.741 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1,313.220 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 9826

HIP

HIP 7513

TIC

TIC 189576919

Gaia DR2

Gaia DR2 348020448377061376

Gaia DR3

Gaia DR3 348020482735930112

System

ups And

Percentile among Gas Giant cohort

Radius 12.500 R⊕ · percentile 28 / cohort 1771

Mass 3,257.741 M⊕ · percentile 88 / cohort 1747

Orbital period 1,276.46 d · percentile 81 / cohort 1533

Distance 13.41 pc · percentile 1 / cohort 1759

ESI 0.380 · percentile 79 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,276.460 days

Semi-major axis

2.5133 AU

Eccentricity

0.299

Inclination

— °

Year Length

A year here lasts about 3.49 Earth years on a mildly elliptical path at a mean orbital distance of 2.5133 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

56.260 m/s

Transit mid-time (BJD)

2,455,937.3000

Long. of periastron (ω)

258.82°

Angular separation (arcsec)

187.00000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.380

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Butler et al. 1999

Instrument

Multiple Instruments

Publication

1999-12

Observation locale

Ground

Host System: ups And

Spectral Class

F-type yellow-white

Effective Temperature

6,157 K — hotter than the Sun (5,778 K)

Estimated Age

5.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.560 R☉

Stellar Mass

1.300 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

4.125 dex

Stellar density

0.370 g/cm³

Systemic radial velocity

-28.66 km/s

Rotational v·sin i

9.20 km/s

Rotation period

12.00 days

Activity index (log R'HK)

-5.040

Metallicity ratio

[M/H]

Distance

13.41 parsec

Light-years 43.72 ly

V-band magnitude

4.10 mag

Voyager-speed travel 771,047 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

74.571 mas

Total Proper Motion

419.857 mas/yr

PM Right Ascension

-172.25 mas/yr

PM Declination

-382.90 mas/yr

Galactic Cartesian (pc)

x = 0.684 · y = 0.307 · z = 0.661

Equatorial (J2000)

RA 24.19835° · Dec 41.40381°

Galactic ℓ, b

132.000° · -20.668°

Ecliptic λ, β

38.545° · 28.979°

HTM-20 index

1454011361

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes