About Sadr
Sadr is an uncommon star. It lies about 1,832.3 light-years from Earth, sits in the constellation Cyg, shines at apparent magnitude 2.23 and has spectral type F8Ib.
Notable enough to have earned a proper name, not just a catalogue number.
Uncommon star 29 EP
Sadr
RA 305.5571° · Dec 40.2567° · star
Score breakdown
· 4 badgesUncommon 33 pts → Rare
- Distant (>1000 ly) +10
- Naked-eye visible +8
- Has a proper name +8
- Star +3
Total score 29
4 more points to reach Rare.
Badges
- Star · +3
- Distant (>1000 ly) · +10
- Naked-eye visible · +8
- Has a proper name · +8
Trivia
Could we get there?
- Verdict. Impossible with our current technology — and the next millennium of it.
Getting there
- Aboard Voyager 1. ≈ 32.2 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 2.9 million years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 18.3 thousand years in a starship at a tenth of light speed.
- Distance. 1832 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 194.
Saying hello
- Say hello. A radio message and its reply would take 3665 years round-trip.
How we found it
- Named. Notable enough to have earned a proper name, not just a catalogue number.
Properties
- absmag
- -6.518
- bv
- 0.673
- constellation
- Cyg
- dist ly
- 1832.3372
- mag
- 2.23
- name
- Sadr
- named
- yes
- spect
- F8Ib
How to see it
Look for Sadr in the constellation Cyg. At apparent magnitude 2.23, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, Sadr 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 Sadr is an uncommon star
Sadr scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, Distant (>1000 ly), 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.