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Uncommon variable star 24 EP

HD 73575

RA 129.9277° · Dec 19.7785° · star

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Score breakdown

· 6 badges
24 pts · Uncommon
Uncommon 34 pts → Rare
  • Giant star +6
  • Variable star +5
  • Gently variable +4
  • On the zodiac +3
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 24

10 more points to reach Rare.

Badges

  • Variable star · +5
  • On the zodiac · +3
  • Yellow-white F-type star · +3
  • Giant star · +6
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F0III — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • Where it is in life. It is a giant. It has already exhausted its core hydrogen and swollen up enormously in response.
  • 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.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 6.7 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Cancer.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around January — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

absmag
0.41
bv
0.248
constellation
Cnc
dist ly
577.2674
luminosity
59.7035
mag
6.65
name
HD 73575
spect
F0III
var amplitude
0.07
var designation
BT
var max
6.618
var min
6.688

About HD 73575

HD 73575 is an uncommon variable star. It lies about 577.3 light-years from Earth, sits in the constellation Cnc, shines at apparent magnitude 6.65 and has spectral type F0III.

Its spectrum reads F0III — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 73575 in the constellation Cnc. At apparent magnitude 6.65, it is an easy target for binoculars.

Like any astronomical target, HD 73575 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 73575 is an uncommon variable star

HD 73575 scores 24 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 10 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, On the zodiac, Yellow-white F-type star, Giant 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.