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Rare variable star 48 EP

HIP 85148

RA 261.0095° · Dec -29.3411° · star

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Score breakdown

· 5 badges
48 pts · Rare
Rare 50 pts → Epic
  • Carbon star (sooty red) +24
  • Bright giant +12
  • Variable star +5
  • Gently variable +4
  • A named variable star +3
Total score 48

2 more points to reach Epic.

Badges

  • Variable star · +5
  • Carbon star (sooty red) · +24
  • Bright giant · +12
  • Gently variable · +4
  • A named variable star · +3

Trivia

Hard to believe

  • True brightness. It pours out about 285.8 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 CII... — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.
  • Where it is in life. It is a bright giant, well on its way to the largest stars there are.
  • 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 11.2 you'll want a small backyard telescope, over in Ophiuchus.
  • 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 yellow-white (B−V 0.4) — a shade brighter and crisper than our own Sun.

Properties

absmag
-8.81
bv
0.428
constellation
Oph
luminosity
291071.7118
mag
11.19
name
HIP 85148
spect
CII...
var amplitude
0.22
var designation
V2309
var max
11.08
var min
11.3

About HIP 85148

HIP 85148 is a rare variable star. It sits in the constellation Oph, shines at apparent magnitude 11.19 and has spectral type CII....

Its spectrum reads CII... — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.

How to see it

Look for HIP 85148 in the constellation Oph. At apparent magnitude 11.19, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 85148 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 85148 is a rare variable star

HIP 85148 scores 48 points on Spacedle's rarity scale, which places it in the rare tier. Another 2 points would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Carbon star (sooty red), Bright giant, 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.