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Uncommon star 30 EP

HIP 5355

RA 17.1116° · Dec -32.7199° · star

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Score breakdown

· 3 badges
30 pts · Uncommon
Uncommon 34 pts → Rare
  • White dwarf (a burnt-out core) +22
  • Blue-white star +5
  • Star +3
Total score 30

4 more points to reach Rare.

Badges

  • Star · +3
  • White dwarf (a burnt-out core) · +22
  • Blue-white star · +5

Trivia

Hard to believe

  • True brightness. It pours out about 109.6 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 DA: — a white dwarf — the exposed, Earth-sized cinder of a dead star, with nothing left to burn.

Find it in the sky

  • How to spot it. At magnitude 12.2 it is far too faint for the eye: this one belongs to cameras and long exposures, over in Sculptor.
  • 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 October — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out blue-white (B−V -0.2) — the hallmark of a surface far hotter than the Sun's.
  • 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 14350 K, against the Sun's 5778 K.

Properties

absmag
-7.77
bv
-0.23
constellation
Scl
luminosity
111686.3248
mag
12.23
name
HIP 5355
spect
DA:

About HIP 5355

HIP 5355 is an uncommon star. It sits in the constellation Scl, shines at apparent magnitude 12.23 and has spectral type DA:.

Its spectrum reads DA: — a white dwarf — the exposed, Earth-sized cinder of a dead star, with nothing left to burn.

How to see it

Look for HIP 5355 in the constellation Scl. At apparent magnitude 12.23, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, HIP 5355 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 HIP 5355 is an uncommon star

HIP 5355 scores 30 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.

That score comes from 3 science badges — Star, White dwarf (a burnt-out core) and Blue-white 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.