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Uncommon exoplanet 29 EP

V0391 Peg b

RA 331.0504° · Dec 26.4188° · exoplanet

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Score breakdown

· 4 badges
29 pts · Uncommon
Uncommon 34 pts → Rare
  • Orbits a hot blue-white star +14
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 29

5 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4
  • Orbits a hot blue-white star · +14

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 14.8 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • 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 August — 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. ≈ 68.5 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 6.1 million years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
2.49
diameter km
167106.22
discovery facility
Multiple Observatories
discovery method
Pulsation Timing Variations
discovery year
2007
dist ly
3900.7605
eccentricity
0
eq temp k
519.69
host star teff
29300
insolation
9.375
mag
14.769
mass earth
1017.056
name
V0391 Peg b
orbital period days
1170
radius earth
13.1
semi major au
1.7
spect
sdBV
sys num planets
1
sys num stars
1

About V0391 Peg b

V0391 Peg b is an uncommon exoplanet. It lies about 3,900.8 light-years from Earth, shines at apparent magnitude 14.77, has spectral type sdBV and has an equilibrium temperature near 520 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 14.77, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, V0391 Peg 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 V0391 Peg b is an uncommon exoplanet

V0391 Peg b scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 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 Orbits a hot blue-white star — 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.