Rare variable star 35 EP

HD 175043

RA 283.5750° · Dec -19.9330° · star

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Score breakdown

· 7 badges

35 pts · Rare

Rare 50 pts → Epic

Toward the galactic centre +8
Hot blue B-type star +6
Giant star +6
Variable star +5
Gently variable +4
On the zodiac +3
A named variable star +3

Total score 35

15 more points to reach Epic.

Badges

Variable star · +5
Toward the galactic centre · +8
On the zodiac · +3
Hot blue B-type star · +6
Giant star · +6
Gently variable · +4
A named variable star · +3

Trivia

Hard to believe

True brightness. It pours out about 4.1 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 B7III — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.
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.

Find it in the sky

How to spot it. At magnitude 8.3 it is just past naked-eye reach — ordinary binoculars will pull it in, 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.

Its true colour

Its true colour. Measured through blue and visual filters it comes out brilliant white (B−V 0) — hotter and whiter than the Sun, the colour of Sirius or Vega.

Properties

absmag: -11.7
bv: 0.031
constellation: Sgr
luminosity: 4168693.8347
mag: 8.3
name: HD 175043
spect: B7III
var amplitude: 0.11
var designation: V4408
var max: 8.256
var min: 8.366

Nearby objects

About HD 175043

HD 175043 is a rare variable star. It sits in the constellation Sgr, shines at apparent magnitude 8.3 and has spectral type B7III.

Its spectrum reads B7III — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.

How to see it

Look for HD 175043 in the constellation Sgr. At apparent magnitude 8.3, it is an easy target for binoculars.

Like any astronomical target, HD 175043 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 175043 is a rare variable star

HD 175043 scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 15 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Toward the galactic centre, On the zodiac, Hot blue B-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.