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Rare exoplanet 49 EP

MASCARA-1 b

RA 317.5515° · Dec 10.7389° · exoplanet

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Score breakdown

· 5 badges
49 pts · Rare
Rare 50 pts → Epic
  • Ultra-hot Jupiter +26
  • Tidally locked +10
  • Confirmed exoplanet +5
  • Gas giant +4
  • Blasted by starlight +4
Total score 49

1 more point to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Ultra-hot Jupiter · +26
  • Tidally locked · +10
  • Blasted by starlight · +4

Trivia

What makes it special

  • Ultra-hot Jupiter. So hot that iron vaporises on the dayside, blows around to the night side and rains back down as molten metal.

What it actually is

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.
  • 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 8.3 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 August — that's when to go looking.

Could we get there?

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

Properties

density gcc
1.5
diameter km
228345.4474
discovery facility
Multiple Observatories
discovery method
Transit
discovery year
2017
dist ly
594.4943
eccentricity
0.0003
eq temp k
2594.3
host star teff
7490
inclination
88.45
insolation
38711.5
mag
8.28
mass earth
1175.971
name
MASCARA-1 b
orbital period days
2.1488
radius earth
17.9007
semi major au
0.0404
spect
A8
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About MASCARA-1 b

MASCARA-1 b is a rare exoplanet. It lies about 594.5 light-years from Earth, shines at apparent magnitude 8.28, has spectral type A8 and has an equilibrium temperature near 2,594 K.

So hot that iron vaporises on the dayside, blows around to the night side and rains back down as molten metal.

How to see it

At apparent magnitude 8.28, it is an easy target for binoculars.

Like any astronomical target, MASCARA-1 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 MASCARA-1 b is a rare exoplanet

MASCARA-1 b scores 49 points on Spacedle's rarity scale, which places it in the rare tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Ultra-hot Jupiter, Tidally locked and Blasted by starlight — 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.