← Back to dex
Trash variable star 5 EP

17 Com

RA 187.2279° · Dec 25.9129° · star

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

Computing the sky for your location…

Score breakdown

· 1 badge
5 pts · Trash
Trash 15 pts → Common
  • Variable star +5
Total score 5

10 more points to reach Common.

Badges

  • Variable star · +5

Trivia

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 4.2 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 371.2 thousand years even at the Parker Solar Probe's 192 km/s.
  • At 10% light speed. ≈ 2377 years in a starship at a tenth of light speed.
  • Distance. 238 light-years from Earth.

Look-back time

  • Look-back time. The light you'd see left around the year 1788.

Saying hello

  • Say hello. A radio message and its reply would take 475 years round-trip.

Properties

absmag
0.977
bv
-0.056
constellation
Com
dist ly
237.723
mag
5.29
name
17 Com
spect
A0p

About 17 Com

17 Com is a trash variable star. It lies about 237.7 light-years from Earth, sits in the constellation Com, shines at apparent magnitude 5.29 and has spectral type A0p.

17 Com is a trash variable star worth 5 points across 1 science badge. Explore its facts, badges and place on the sky map, then add it to your dex on Spacedle.

How to see it

Look for 17 Com in the constellation Com. At apparent magnitude 5.29, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, 17 Com 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 17 Com is a trash variable star

17 Com scores 5 points on Spacedle's rarity scale, which places it in the trash tier. Another 10 points would lift it into a rarer tier.

That score comes from 1 science badge — 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.

spacedle A daily roll through the real universe. © 2026 spacedle. Buy me a coffee

Sky imagery and survey data courtesy of Aladin Lite & CDS, Strasbourg. Object data from the NASA Exoplanet Archive, JPL Small-Body Database, and the ATNF Pulsar Catalogue.