About HD 181433 c
HD 181433 c is a trash exoplanet. It lies about 87.7 light-years from Earth, shines at apparent magnitude 8.4, has spectral type K3 IV and has an equilibrium temperature near 154 K.
One of at least 3 planets orbiting its star.
Trash exoplanet 11 EP
HD 181433 c
RA 291.2874° · Dec -66.4678° · exoplanet
Score breakdown
· 2 badgesTrash 15 pts → Common
- Multi-planet system +6
- Confirmed exoplanet +5
Total score 11
4 more points to reach Common.
Badges
- Confirmed exoplanet · +5
- Multi-planet system · +6
Trivia
What it actually is
- Crowded system. One of at least 3 planets orbiting its star.
Sense of scale
- In perspective. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.
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.
- Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
- Best time of year. It stands highest in the middle of the night around July — 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. ≈ 1.5 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 136.9 thousand years even at the Parker Solar Probe's 192 km/s.
Properties
- discovery facility
- La Silla Observatory
- discovery method
- Radial Velocity
- discovery year
- 2008
- dist ly
- 87.6583
- eccentricity
- 0.2402
- eq temp k
- 153.53
- host star teff
- 4918
- inclination
- 111
- insolation
- 0.0984
- mag
- 8.4
- mass earth
- 2207.0005
- name
- HD 181433 c
- orbital period days
- 1018.5
- semi major au
- 1.885
- spect
- K3 IV
- sys num planets
- 3
- sys num stars
- 1
Nearby objects
- Uncommon HD 181433 d exoplanet · <0.1° away
- Common HD 181433 b exoplanet · <0.1° away
- Trash GL Gl 756.1 star · <0.1° away
- Trash HD 180865 star · 0.4° away
- Common HD 180775 star · 0.4° away
- Uncommon HD 180474 variable star · 0.4° away
- Uncommon IC 4859 galaxy · 0.6° away
- Common HD 182860 star · 0.6° away
How to see it
At apparent magnitude 8.4, it is an easy target for binoculars.
Like any astronomical target, HD 181433 c 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 181433 c is a trash exoplanet
HD 181433 c scores 11 points on Spacedle's rarity scale, which places it in the trash tier. Another 4 points would lift it into a rarer tier.
That score comes from 2 science badges — Confirmed exoplanet and Multi-planet system — 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.