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Rare variable star 47 EP

HD 195435

RA 307.9290° · Dec -11.8843° · star

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Score breakdown

· 6 badges
47 pts · Rare
Rare 50 pts → Epic
  • Carbon star (sooty red) +24
  • Deep red star +8
  • Variable star +5
  • Gently variable +4
  • On the zodiac +3
  • A named variable star +3
Total score 47

3 more points to reach Epic.

Badges

  • Variable star · +5
  • On the zodiac · +3
  • Carbon star (sooty red) · +24
  • Deep red star · +8
  • Gently variable · +4
  • A named variable star · +3

Trivia

Hard to believe

  • True brightness. It pours out about 1.3 million 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 C — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.
  • 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 9.6 you'll want a small backyard telescope, over in Capricornus.
  • 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 July — 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 3850 K, against the Sun's 5778 K.

Properties

absmag
-10.42
bv
1.46
constellation
Cap
luminosity
1282330.5827
mag
9.58
name
HD 195435
spect
C
var amplitude
0.15
var designation
BI
var max
9.503
var min
9.653

About HD 195435

HD 195435 is a rare variable star. It sits in the constellation Cap, shines at apparent magnitude 9.58 and has spectral type C.

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

How to see it

Look for HD 195435 in the constellation Cap. At apparent magnitude 9.58, a small backyard telescope will bring it into view.

Like any astronomical target, HD 195435 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 195435 is a rare variable star

HD 195435 scores 47 points on Spacedle's rarity scale, which places it in the rare tier. Another 3 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, On the zodiac, Carbon star (sooty red), Deep red star, 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.