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Epic variable star 51 EP

HR 4876

RA 192.8249° · Dec -60.3298° · star

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Score breakdown

· 7 badges
51 pts · Epic
Epic 78 pts → Anomaly
  • Supergiant +18
  • Naked-eye visible +8
  • Under the Southern Cross +8
  • Variable star +5
  • White A-type star +5
  • Gently variable +4
  • A named variable star +3
Total score 51

27 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Under the Southern Cross · +8
  • White A-type star · +5
  • Supergiant · +18
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads A2Iab — 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.
  • Where it is in life. It is a supergiant. Drop it where the Sun is and its surface would engulf the inner planets.
  • 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 5.7 you can see it with your own eyes from a dark site, over in Crux.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around April — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out yellow-white (B−V 0.3) — a shade brighter and crisper than our own Sun.
  • 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
-14.29
bv
0.344
constellation
Cru
luminosity
45289757.9904
mag
5.71
name
HR 4876
spect
A2Iab
var amplitude
0.06
var designation
DS
var max
5.689
var min
5.749

About HR 4876

HR 4876 is an epic variable star. It sits in the constellation Cru, shines at apparent magnitude 5.71 and has spectral type A2Iab.

Its spectrum reads A2Iab — 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 HR 4876 in the constellation Cru. At apparent magnitude 5.71, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HR 4876 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 HR 4876 is an epic variable star

HR 4876 scores 51 points on Spacedle's rarity scale, which places it in the epic tier. Another 27 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Naked-eye visible, Under the Southern Cross, White A-type star, Supergiant, Gently 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.