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Uncommon variable star 31 EP

HD 325013

RA 272.3016° · Dec -40.2037° · star

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Score breakdown

· 5 badges
31 pts · Uncommon
Uncommon 34 pts → Rare
  • Strongly variable +10
  • Deep red star +8
  • Variable star +5
  • White A-type star +5
  • A named variable star +3
Total score 31

3 more points to reach Rare.

Badges

  • Variable star · +5
  • White A-type star · +5
  • Deep red star · +8
  • Strongly variable · +10
  • A named variable star · +3

Trivia

Hard to believe

  • True brightness. It pours out about 487.5 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 A/Fe-K — 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.
  • It changes. This star does not hold still: its brightness rises and falls on a rhythm of hours, days or years, either pulsing in size or being eclipsed by a companion.

Find it in the sky

  • How to spot it. At magnitude 10.6 you'll want a small backyard telescope, over in Corona Australis.
  • 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 June — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out deep orange-red (B−V 1.5) — one of the coolest surfaces a star can have while still fusing.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 3810 K, against the Sun's 5778 K.

Properties

absmag
-9.39
bv
1.49
constellation
CrA
luminosity
496592.3215
mag
10.61
name
HD 325013
spect
A/Fe-K
var amplitude
0.83
var designation
QT
var max
10.352
var min
11.182

About HD 325013

HD 325013 is an uncommon variable star. It sits in the constellation CrA, shines at apparent magnitude 10.61 and has spectral type A/Fe-K.

Its spectrum reads A/Fe-K — 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 325013 in the constellation CrA. At apparent magnitude 10.61, a small backyard telescope will bring it into view.

Like any astronomical target, HD 325013 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 325013 is an uncommon variable star

HD 325013 scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, White A-type star, Deep red star, Strongly variable and A named variable 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.