About Tianyi
Tianyi is a common star. It lies about 741.3 light-years from Earth, sits in the constellation Dra, shines at apparent magnitude 5.43 and has spectral type K5III.
Notable enough to have earned a proper name, not just a catalogue number.
Common star 19 EP
Tianyi
RA 191.8931° · Dec 66.7903° · star
Score breakdown
· 3 badgesCommon 24 pts → Uncommon
- Naked-eye visible +8
- Has a proper name +8
- Star +3
Total score 19
5 more points to reach Uncommon.
Badges
- Star · +3
- Naked-eye visible · +8
- 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. ≈ 13 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 1.2 million years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 7413 years in a starship at a tenth of light speed.
- Distance. 741 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1285.
Saying hello
- Say hello. A radio message and its reply would take 1483 years round-trip.
How we found it
- Named. Notable enough to have earned a proper name, not just a catalogue number.
Properties
- absmag
- -1.353
- bv
- 1.567
- constellation
- Dra
- dist ly
- 741.2635
- mag
- 5.43
- name
- Tianyi
- named
- yes
- spect
- K5III
How to see it
Look for Tianyi in the constellation Dra. At apparent magnitude 5.43, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, Tianyi 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 Tianyi is a common star
Tianyi scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 5 points would lift it into a rarer tier.
That score comes from 3 science badges — Star, Naked-eye visible 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.