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Uncommon variable star 29 EP

HD 198827

RA 313.6716° · Dec -45.7307° · star

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Score breakdown

· 6 badges
29 pts · Uncommon
Uncommon 34 pts → Rare
  • Strongly variable +10
  • Distant (over 1,000 light-years) +6
  • Variable star +5
  • Yellow-white F-type star +3
  • A named variable star +3
  • Main-sequence star +2
Total score 29

5 more points to reach Rare.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • Yellow-white F-type star · +3
  • Main-sequence star · +2
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F5/F6V — 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 9.5 you'll want a small backyard telescope, over in Indus.
  • 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 August — that's when to go looking.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 30.6 million years at Voyager 1's speed (17 km/s).

Properties

absmag
0.849
bv
0.493
constellation
Ind
dist ly
1744.1499
luminosity
39.8474
mag
9.49
name
HD 198827
spect
F5/F6V
var amplitude
0.51
var designation
SU
var max
9.449
var min
9.959

About HD 198827

HD 198827 is an uncommon variable star. It lies about 1,744.1 light-years from Earth, sits in the constellation Ind, shines at apparent magnitude 9.49 and has spectral type F5/F6V.

Its spectrum reads F5/F6V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 198827 in the constellation Ind. At apparent magnitude 9.49, a small backyard telescope will bring it into view.

Like any astronomical target, HD 198827 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 198827 is an uncommon variable star

HD 198827 scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Distant (over 1,000 light-years), Yellow-white F-type star, Main-sequence star, Strongly 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.