← Back to dex
Common variable star 21 EP

Rho Pav

RA 309.3970° · Dec -61.5299° · star

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 5 badges
21 pts · Common
Common 22 pts → Uncommon
  • Naked-eye visible +8
  • Variable star +5
  • Yellow-white F-type star +3
  • A named variable star +3
  • Barely variable (under 0.05 mag) +2
Total score 21

1 more point to reach Uncommon.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Yellow-white F-type star · +3
  • Barely variable (under 0.05 mag) · +2
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads Fm delta Del — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • 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 4.9 you can see it with your own eyes from a dark site, over in Pavo.
  • 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 July — that's when to go looking.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 3.3 million years at Voyager 1's speed (17 km/s).

Properties

absmag
1.038
bv
0.447
constellation
Pav
dist ly
189.6255
luminosity
33.4811
mag
4.86
name
Rho Pav
spect
Fm delta Del
var amplitude
0.03
var designation
Rho
var max
4.844
var min
4.874

About Rho Pav

Rho Pav is a common variable star. It lies about 189.6 light-years from Earth, sits in the constellation Pav, shines at apparent magnitude 4.86 and has spectral type Fm delta Del.

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

How to see it

Look for Rho Pav in the constellation Pav. At apparent magnitude 4.86, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, Rho Pav 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 Rho Pav is a common variable star

Rho Pav scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Naked-eye visible, Yellow-white F-type star, Barely variable (under 0.05 mag) 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.