← Back to dex
Common variable star 20 EP

HIP 42303

RA 129.3755° · Dec 23.5616° · star

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

Computing the sky for your location…

Score breakdown

· 6 badges
20 pts · Common
Common 22 pts → Uncommon
  • Variable star +5
  • Gently variable +4
  • On the zodiac +3
  • Yellow-white F-type star +3
  • A named variable star +3
  • Main-sequence star +2
Total score 20

2 more points to reach Uncommon.

Badges

  • Variable star · +5
  • On the zodiac · +3
  • Yellow-white F-type star · +3
  • Main-sequence star · +2
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F9V: + G9V: — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • Where it is in life. It is on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.
  • 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 10.1 you'll want a small backyard telescope, 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
2.839
bv
0.601
constellation
Cnc
dist ly
911.0503
luminosity
6.3738
mag
10.07
name
HIP 42303
spect
F9V: + G9V:
var amplitude
0.36
var designation
RU
var max
10.008
var min
10.368

About HIP 42303

HIP 42303 is a common variable star. It lies about 911.1 light-years from Earth, sits in the constellation Cnc, shines at apparent magnitude 10.07 and has spectral type F9V: + G9V:.

Its spectrum reads F9V: + G9V: — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HIP 42303 in the constellation Cnc. At apparent magnitude 10.07, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 42303 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 HIP 42303 is a common variable star

HIP 42303 scores 20 points on Spacedle's rarity scale, which places it in the common tier. Another 2 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, Main-sequence 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.