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Trash star 14 EP

HD 245778

RA 84.5224° · Dec 6.5345° · star

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Score breakdown

· 3 badges
14 pts · Trash
Trash 15 pts → Common
  • In Orion's hunting ground +6
  • White A-type star +5
  • Star +3
Total score 14

1 more point to reach Common.

Badges

  • Star · +3
  • In Orion's hunting ground · +6
  • White A-type star · +5

Trivia

Hard to believe

  • True brightness. It pours out about 373.3 thousand times as much light as the Sun. It only looks ordinary because it is so far away.

What it actually is

  • Spectral class. Its spectrum reads A3 — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

Find it in the sky

  • How to spot it. At magnitude 10.9 you'll want a small backyard telescope, over in Orion.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around December — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out brilliant white (B−V 0.1) — hotter and whiter than the Sun, the colour of Sirius or Vega.
  • Why no green stars. No star ever looks green: a surface hot enough to peak in green also floods out plenty of red and blue, and your eye blends the mixture back to white.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 8770 K, against the Sun's 5778 K.

Properties

absmag
-9.1
bv
0.127
constellation
Ori
luminosity
380189.3963
mag
10.9
name
HD 245778
spect
A3

Nearby objects

About HD 245778

HD 245778 is a trash star. It sits in the constellation Ori, shines at apparent magnitude 10.9 and has spectral type A3.

Its spectrum reads A3 — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

How to see it

Look for HD 245778 in the constellation Ori. At apparent magnitude 10.9, a small backyard telescope will bring it into view.

Like any astronomical target, HD 245778 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 245778 is a trash star

HD 245778 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 3 science badges — Star, In Orion's hunting ground and White A-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.