Trash star 14 EP

HD 43907

RA 94.9385° · Dec 22.1108° · star

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Score breakdown

· 4 badges

14 pts · Trash

Trash 15 pts → Common

Hot blue B-type star +6
Star +3
On the zodiac +3
Main-sequence star +2

Total score 14

1 more point to reach Common.

Badges

Star · +3
On the zodiac · +3
Hot blue B-type star · +6
Main-sequence star · +2

Trivia

Hard to believe

True brightness. It pours out about 2.9 million 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 B1V:p: — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.
Where it is in life. It is on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.

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 Gemini.
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.

Its true colour

Its true colour. Measured through blue and visual filters it comes out brilliant white (B−V 0.3) — 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.

Properties

absmag: -11.31
bv: 0.294
constellation: Gem
luminosity: 2910717.1181
mag: 8.69
name: HD 43907
spect: B1V:p:

Nearby objects

About HD 43907

HD 43907 is a trash star. It sits in the constellation Gem, shines at apparent magnitude 8.69 and has spectral type B1V:p:.

Its spectrum reads B1V:p: — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.

How to see it

Look for HD 43907 in the constellation Gem. At apparent magnitude 8.69, it is an easy target for binoculars.

Like any astronomical target, HD 43907 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 43907 is a trash star

HD 43907 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, On the zodiac, Hot blue B-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.