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Uncommon variable star 25 EP

Altair

RA 297.6958° · Dec 8.8683° · star

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Score breakdown

· 3 badges
25 pts · Uncommon
Uncommon 33 pts → Rare
  • Nearby (<25 ly) +12
  • Has a proper name +8
  • Variable star +5
Total score 25

8 more points to reach Rare.

Badges

  • Variable star · +5
  • Nearby (<25 ly) · +12
  • Has a proper name · +8

Trivia

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 294 thousand years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 26.1 thousand years even at the Parker Solar Probe's 192 km/s.
  • At 10% light speed. ≈ 167 years in a starship at a tenth of light speed.
  • Distance. 16.7 light-years from Earth.

Look-back time

  • Look-back time. The light you'd see left around the year 2009.

Saying hello

  • Say hello. A radio message and its reply would take 33.5 years round-trip.

How we found it

  • Named. Notable enough to have earned a proper name, not just a catalogue number.

Properties

absmag
2.21
bv
0.221
constellation
Aql
dist ly
16.7302
mag
0.76
name
Altair
named
yes
spect
A7IV-V

About Altair

Altair is an uncommon variable star. It lies about 16.7 light-years from Earth, sits in the constellation Aql, shines at apparent magnitude 0.76 and has spectral type A7IV-V.

Notable enough to have earned a proper name, not just a catalogue number.

How to see it

Look for Altair in the constellation Aql. At apparent magnitude 0.76, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, Altair 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 Altair is an uncommon variable star

Altair scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 8 points would lift it into a rarer tier.

That score comes from 3 science badges — Variable star, Nearby (<25 ly) and Has a proper name — 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.

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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.