← Back to dex
Rare variable star 38 EP

44Rho1Sgr

RA 290.4182° · Dec -17.8472° · star

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

Computing the sky for your location…

Score breakdown

· 8 badges
38 pts · Rare
Rare 50 pts → Epic
  • Naked-eye visible +8
  • Toward the galactic centre +8
  • Giant star +6
  • Variable star +5
  • On the zodiac +3
  • Yellow-white F-type star +3
  • A named variable star +3
  • Barely variable (under 0.05 mag) +2
Total score 38

12 more points to reach Epic.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Toward the galactic centre · +8
  • On the zodiac · +3
  • Yellow-white F-type star · +3
  • Giant star · +6
  • Barely variable (under 0.05 mag) · +2
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F0III/IV — 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 3.9 you can see it with your own eyes from a dark site, over in Sagittarius.
  • 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.

Could we get there?

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

Properties

absmag
0.969
bv
0.228
constellation
Sgr
dist ly
126.9585
luminosity
35.678
mag
3.92
name
44Rho1Sgr
spect
F0III/IV
var amplitude
0.03
var designation
Rho-1
var max
3.912
var min
3.942

About 44Rho1Sgr

44Rho1Sgr is a rare variable star. It lies about 127 light-years from Earth, sits in the constellation Sgr, shines at apparent magnitude 3.92 and has spectral type F0III/IV.

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

How to see it

Look for 44Rho1Sgr in the constellation Sgr. At apparent magnitude 3.92, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, 44Rho1Sgr 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 44Rho1Sgr is a rare variable star

44Rho1Sgr scores 38 points on Spacedle's rarity scale, which places it in the rare tier. Another 12 points would lift it into a rarer tier.

That score comes from 8 science badges — Variable star, Naked-eye visible, Toward the galactic centre, On the zodiac, Yellow-white F-type star, Giant 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.