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Rare exoplanet 35 EP

TIC 172900988 b

RA 128.6617° · Dec 31.5540° · exoplanet

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Score breakdown

· 5 badges
35 pts · Rare
Rare 50 pts → Epic
  • Circumbinary (orbits both stars) +14
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
  • Found by TESS +4
Total score 35

15 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Circumbinary (orbits both stars) · +14
  • Found by TESS · +4
  • Orbits a Sun-like star · +8

Trivia

What it actually is

  • What it is made of. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.

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 10.1 you'll want a small backyard telescope.
  • 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 January — 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. ≈ 14.4 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 1.3 million years even at the Parker Solar Probe's 192 km/s.

Properties

circumbinary
yes
density gcc
3.64
diameter km
143507.25
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2021
dist ly
818.5081
eccentricity
0.0271
eq temp k
361.24
host star teff
6050
inclination
91.79
insolation
5.7522
mag
10.141
mass earth
942
name
TIC 172900988 b
orbital period days
200.452
radius earth
11.25
semi major au
0.9028
spect
F9
sys num planets
1
sys num stars
2

About TIC 172900988 b

TIC 172900988 b is a rare exoplanet. It lies about 818.5 light-years from Earth, shines at apparent magnitude 10.14, has spectral type F9 and has an equilibrium temperature near 361 K.

Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.

How to see it

At apparent magnitude 10.14, a small backyard telescope will bring it into view.

Like any astronomical target, TIC 172900988 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 TIC 172900988 b is a rare exoplanet

TIC 172900988 b scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 15 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Circumbinary (orbits both stars), Found by TESS and Orbits a Sun-like 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.