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Trash exoplanet 9 EP

HD 28678 b

RA 67.8561° · Dec 4.5752° · exoplanet

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Score breakdown

· 2 badges
9 pts · Trash
Trash 15 pts → Common
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 9

6 more points to reach Common.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4

Trivia

What it actually is

  • What it is made of. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

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 8.4 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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 November — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Getting there

  • Aboard Voyager 1. ≈ 10.9 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 967.1 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
1.09
diameter km
172208.7
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2011
dist ly
619.3963
eccentricity
0.149
eq temp k
561.84
host star teff
4972
insolation
16.4464
mag
8.38
mass earth
490.0939
name
HD 28678 b
orbital period days
380.2
radius earth
13.5
semi major au
1.18
spect
G8 IV
sys num planets
1
sys num stars
1

About HD 28678 b

HD 28678 b is a trash exoplanet. It lies about 619.4 light-years from Earth, shines at apparent magnitude 8.38, has spectral type G8 IV and has an equilibrium temperature near 562 K.

Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

How to see it

At apparent magnitude 8.38, it is an easy target for binoculars.

Like any astronomical target, HD 28678 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 28678 b is a trash exoplanet

HD 28678 b scores 9 points on Spacedle's rarity scale, which places it in the trash tier. Another 6 points would lift it into a rarer tier.

That score comes from 2 science badges — Confirmed exoplanet and Gas giant — 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.