Trash star 11 EP

HD 100339

RA 173.2075° · Dec 18.0023° · star

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Score breakdown

· 4 badges

11 pts · Trash

Trash 15 pts → Common

Star +3
On the zodiac +3
Yellow-white F-type star +3
Main-sequence star +2

Total score 11

4 more points to reach Common.

Badges

Star · +3
On the zodiac · +3
Yellow-white F-type star · +3
Main-sequence star · +2

Trivia

What it actually is

Spectral class. Its spectrum reads F7V — 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 7.3 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Leo.
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 March — 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. ≈ 2.7 million years at Voyager 1's speed (17 km/s).

Properties

absmag: 3.878
bv: 0.513
constellation: Leo
dist ly: 154.7962
luminosity: 2.4479
mag: 7.26
name: HD 100339
spect: F7V

Nearby objects

About HD 100339

HD 100339 is a trash star. It lies about 154.8 light-years from Earth, sits in the constellation Leo, shines at apparent magnitude 7.26 and has spectral type F7V.

Its spectrum reads F7V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 100339 in the constellation Leo. At apparent magnitude 7.26, it is an easy target for binoculars.

Like any astronomical target, HD 100339 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 100339 is a trash star

HD 100339 scores 11 points on Spacedle's rarity scale, which places it in the trash tier. Another 4 points would lift it into a rarer tier.

That score comes from 4 science badges — Star, On the zodiac, 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.