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Epic exoplanet 60 EP

HD 8673 b

RA 21.5378° · Dec 34.5793° · exoplanet

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Score breakdown

· 5 badges
60 pts · Epic
Epic 78 pts → Anomaly
  • In the habitable zone +30
  • Two suns in its sky +12
  • Eccentric orbit +9
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 60

18 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Eccentric orbit · +9
  • Two suns in its sky · +12

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.

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.
  • 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.

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 6.3 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 October — that's when to go looking.

Properties

density gcc
12.4
diameter km
156901.26
discovery facility
Thueringer Landessternwarte Tautenburg
discovery method
Radial Velocity
discovery year
2009
dist ly
123.4889
eccentricity
0.73
eq temp k
219.11
habitable zone
yes
host star teff
6389.05
inclination
95.45
insolation
0.3841
mag
6.331
mass earth
4210.5907
multi star system
yes
name
HD 8673 b
orbital period days
1644.691
radius earth
12.3
semi major au
2.97
spect
F5
sys num planets
1
sys num stars
2

About HD 8673 b

HD 8673 b is an epic exoplanet. It lies about 123.5 light-years from Earth, shines at apparent magnitude 6.33, has spectral type F5 and has an equilibrium temperature near 219 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 6.33, it is an easy target for binoculars.

Like any astronomical target, HD 8673 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 8673 b is an epic exoplanet

HD 8673 b scores 60 points on Spacedle's rarity scale, which places it in the epic tier. Another 18 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, In the habitable zone, Gas giant, Eccentric orbit 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.