← Back to dex
Uncommon exoplanet 24 EP

HD 1690 b

RA 5.3056° · Dec -8.2811° · exoplanet

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 4 badges
24 pts · Uncommon
Uncommon 34 pts → Rare
  • Eccentric orbit +9
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 24

10 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4
  • Eccentric orbit · +9

Trivia

What it actually is

  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 9.2 you'll want a small backyard telescope.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around September — that's when to go looking.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 43.1 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 3.8 million years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
7.86
diameter km
159452.5
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2010
dist ly
2454.699
eccentricity
0.64
eq temp k
841.73
host star teff
4374
insolation
17.8958
mag
9.19
mass earth
2793.7257
name
HD 1690 b
orbital period days
533
radius earth
12.5
semi major au
1.36
spect
K1 III
sys num planets
1
sys num stars
1

About HD 1690 b

HD 1690 b is an uncommon exoplanet. It lies about 2,454.7 light-years from Earth, shines at apparent magnitude 9.19, has spectral type K1 III and has an equilibrium temperature near 842 K.

Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

How to see it

At apparent magnitude 9.19, a small backyard telescope will bring it into view.

Like any astronomical target, HD 1690 b is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.

Why HD 1690 b is an uncommon exoplanet

HD 1690 b scores 24 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 10 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Gas giant and Eccentric orbit — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.