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Uncommon star 26 EP

HR 6144

RA 247.6251° · Dec -7.5145° · star

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Score breakdown

· 3 badges
26 pts · Uncommon
Uncommon 34 pts → Rare
  • Supergiant +18
  • White A-type star +5
  • Star +3
Total score 26

8 more points to reach Rare.

Badges

  • Star · +3
  • White A-type star · +5
  • Supergiant · +18

Trivia

What it actually is

  • Spectral class. Its spectrum reads A7Ib — 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, hundreds of times wider than the Sun.

Find it in the sky

  • How to spot it. At magnitude 6.5 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Ophiuchus.
  • 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 May — 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 0.4) — 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.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 7040 K, against the Sun's 5778 K.

Properties

absmag
-13.54
bv
0.371
constellation
Oph
luminosity
22698648.5188
mag
6.46
name
HR 6144
spect
A7Ib

About HR 6144

HR 6144 is an uncommon star. It sits in the constellation Oph, shines at apparent magnitude 6.46 and has spectral type A7Ib.

Its spectrum reads A7Ib — 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 6144 in the constellation Oph. At apparent magnitude 6.46, it is an easy target for binoculars.

Like any astronomical target, HR 6144 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 6144 is an uncommon star

HR 6144 scores 26 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 8 points would lift it into a rarer tier.

That score comes from 3 science badges — Star, White A-type star and Supergiant — 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.