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Trash star 9 EP

HD 221789

RA 353.8002° · Dec -11.5777° · star

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Score breakdown

· 3 badges
9 pts · Trash
Trash 15 pts → Common
  • Star +3
  • On the zodiac +3
  • Yellow-white F-type star +3
Total score 9

6 more points to reach Common.

Badges

  • Star · +3
  • On the zodiac · +3
  • Yellow-white F-type star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads Fm delta Del — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

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 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Aquarius.
  • 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 September — 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. ≈ 6.8 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 603.4 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

absmag
2.662
bv
0.316
constellation
Aqr
dist ly
386.4407
luminosity
7.5024
mag
8.03
name
HD 221789
spect
Fm delta Del

About HD 221789

HD 221789 is a trash star. It lies about 386.4 light-years from Earth, sits in the constellation Aqr, shines at apparent magnitude 8.03 and has spectral type Fm delta Del.

Its spectrum reads Fm delta Del — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 221789 in the constellation Aqr. At apparent magnitude 8.03, it is an easy target for binoculars.

Like any astronomical target, HD 221789 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 221789 is a trash star

HD 221789 scores 9 points on Spacedle's rarity scale, which places it in the trash tier. Another 6 points would lift it into a rarer tier.

That score comes from 3 science badges — Star, On the zodiac and Yellow-white F-type 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.