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Epic exoplanet 77 EP

HIP 78530 b

RA 240.4810° · Dec -21.9805° · exoplanet

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Score breakdown

· 6 badges
77 pts · Epic
Epic 78 pts → Anomaly
  • Ultra-hot Jupiter +26
  • Directly imaged +16
  • Orbits a hot blue-white star +14
  • Orbits beyond Neptune's distance +12
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 77

1 more point to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Ultra-hot Jupiter · +26
  • Directly imaged · +16
  • Orbits a hot blue-white star · +14
  • Orbits beyond Neptune's distance · +12

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.

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.

What it actually is

  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

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 7.2 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Southern sky. It rides the southern half of the sky — an easier target the further south 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.

Properties

density gcc
23.2
diameter km
153074.4
discovery facility
Gemini Observatory
discovery method
Imaging
discovery year
2010
dist ly
446.0477
eq temp k
2700
host star teff
10500
insolation
0
mag
7.1691
mass earth
7300
name
HIP 78530 b
radius earth
12
semi major au
740
spect
B9 V
sys num planets
1
sys num stars
1

About HIP 78530 b

HIP 78530 b is an epic exoplanet. It lies about 446 light-years from Earth, shines at apparent magnitude 7.17, has spectral type B9 V and has an equilibrium temperature near 2,700 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 7.17, it is an easy target for binoculars.

Like any astronomical target, HIP 78530 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 HIP 78530 b is an epic exoplanet

HIP 78530 b scores 77 points on Spacedle's rarity scale, which places it in the epic tier. Another 1 point would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Ultra-hot Jupiter, Directly imaged, Orbits a hot blue-white star and Orbits beyond Neptune's distance — 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.