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Rare exoplanet 45 EP

HD 1605 c

RA 5.1318° · Dec 30.9751° · exoplanet

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Score breakdown

· 4 badges
45 pts · Rare
Rare 50 pts → Epic
  • In the habitable zone +30
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 45

5 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Multi-planet system · +6

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

What it actually is

  • What it is made of. Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.
  • What the zone means. The habitable zone is only about temperature: it is the band where liquid water could survive on a surface. It is a promising address, not evidence of anything living.
  • Crowded system. One of at least 2 planets orbiting its star.

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 7.5 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around September — that's when to go looking.

Properties

density gcc
2.88
diameter km
165830.6
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2015
dist ly
289.6419
eccentricity
0.099
eq temp k
233.88
habitable zone
yes
host star teff
4915
insolation
0.5026
mag
7.52
mass earth
1150.5446
name
HD 1605 c
orbital period days
2149
radius earth
13
semi major au
3.584
spect
K1 IV
sys num planets
2
sys num stars
1

About HD 1605 c

HD 1605 c is a rare exoplanet. It lies about 289.6 light-years from Earth, shines at apparent magnitude 7.52, has spectral type K1 IV and has an equilibrium temperature near 234 K.

Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

How to see it

At apparent magnitude 7.52, it is an easy target for binoculars.

Like any astronomical target, HD 1605 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 1605 c is a rare exoplanet

HD 1605 c scores 45 points on Spacedle's rarity scale, which places it in the rare tier. Another 5 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, In the habitable zone, Gas giant 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.