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Common exoplanet 21 EP

HD 142245 b

RA 238.2342° · Dec 15.4306° · exoplanet

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Score breakdown

· 3 badges
21 pts · Common
Common 22 pts → Uncommon
  • Two suns in its sky +12
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 21

1 more point to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Two suns in its sky · +12

Trivia

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.

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 May — 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. ≈ 5.6 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 495.2 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
2.39
diameter km
167106.22
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2011
dist ly
317.1231
eccentricity
0
eq temp k
306.3
host star teff
4922
insolation
1.7468
mag
7.46
mass earth
975.7381
multi star system
yes
name
HD 142245 b
orbital period days
1299
radius earth
13.1
semi major au
2.78
spect
K0
sys num planets
1
sys num stars
3

About HD 142245 b

HD 142245 b is a common exoplanet. It lies about 317.1 light-years from Earth, shines at apparent magnitude 7.46, has spectral type K0 and has an equilibrium temperature near 306 K.

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.

How to see it

At apparent magnitude 7.46, it is an easy target for binoculars.

Like any astronomical target, HD 142245 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 142245 b is a common exoplanet

HD 142245 b scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Two suns in its sky — 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.