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Trash star 14 EP

HD 42921

RA 93.5452° · Dec 17.1005° · star

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Score breakdown

· 4 badges
14 pts · Trash
Trash 15 pts → Common
  • In Orion's hunting ground +6
  • Star +3
  • Yellow-white F-type star +3
  • Main-sequence star +2
Total score 14

1 more point to reach Common.

Badges

  • Star · +3
  • In Orion's hunting ground · +6
  • Yellow-white F-type star · +3
  • Main-sequence star · +2

Trivia

What it actually is

  • Spectral class. Its spectrum reads F5V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • Where it is in life. It is on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.

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 8.7 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Orion.
  • 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 December — 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. ≈ 11.3 million years at Voyager 1's speed (17 km/s).

Properties

absmag
2.209
bv
0.491
constellation
Ori
dist ly
642.0394
luminosity
11.3868
mag
8.68
name
HD 42921
spect
F5V

Nearby objects

About HD 42921

HD 42921 is a trash star. It lies about 642 light-years from Earth, sits in the constellation Ori, shines at apparent magnitude 8.68 and has spectral type F5V.

Its spectrum reads F5V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 42921 in the constellation Ori. At apparent magnitude 8.68, it is an easy target for binoculars.

Like any astronomical target, HD 42921 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 42921 is a trash star

HD 42921 scores 14 points on Spacedle's rarity scale, which places it in the trash tier. Another 1 point would lift it into a rarer tier.

That score comes from 4 science badges — Star, In Orion's hunting ground, Yellow-white F-type star and Main-sequence 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.