About NN Ser d
NN Ser d is an uncommon exoplanet. It lies about 1,682.4 light-years from Earth, spans roughly 13.3 Earth radii, weighs about 724.62 Earth masses and completes an orbit every 2,880 days.
One of at least 2 planets orbiting its star.
Uncommon exoplanet 25 EP
NN Ser d
RA 238.2337° · Dec 12.9121° · exoplanet
Score breakdown
· 4 badgesUncommon 33 pts → Rare
- Distant (>1000 ly) +10
- Multi-planet system +6
- Confirmed exoplanet +5
- Gas giant +4
Total score 25
8 more points to reach Rare.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Multi-planet system · +6
- Distant (>1000 ly) · +10
Trivia
Could we get there?
- Verdict. Impossible with our current technology — and the next millennium of it.
Getting there
- Aboard Voyager 1. ≈ 29.6 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 2.6 million years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 16.8 thousand years in a starship at a tenth of light speed.
- Distance. 1682 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 344.
Saying hello
- Say hello. A radio message and its reply would take 3365 years round-trip.
Standing on it
- A year here. A full year lasts about 7.9 Earth years.
By the numbers
- Size. About 13.3× the width of Earth.
- Volume. About 2353 Earths could fit inside it.
- Mass. Roughly 725× Earth's mass — about 2.3 Jupiters.
- Your weight. You'd weigh about 4.1× your Earth weight standing here.
How we found it
- Discovery. Found by Multiple Observatories using the eclipse timing variations method.
Cosmic context
- Crowded system. One of at least 2 planets orbiting its star.
Properties
- density gcc
- 1.69
- discovery facility
- Multiple Observatories
- discovery method
- Eclipse Timing Variations
- dist ly
- 1682.3714
- eccentricity
- 0.24
- mass earth
- 724.622
- name
- NN Ser d
- orbital period days
- 2880
- radius earth
- 13.3
- sys num planets
- 2
How to see it
Like any astronomical target, NN Ser d 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 NN Ser d is an uncommon exoplanet
NN Ser d 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 4 science badges — Confirmed exoplanet, Gas giant, Multi-planet system and Distant (>1000 ly) — 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.