This object moves — fetching its current position…
Score breakdown
· 5 badges
21 pts · Common
Common22 pts → Uncommon
Crosses Earth's orbit+8
Near-Earth object+5
Apollo: crosses Earth's orbit+4
Stony asteroid+4
Catalogue designation only+0
Total score21
1 more point to reach Uncommon.
Badges
🌠Near-Earth object· +5
🎯Crosses Earth's orbit· +8
🔢Catalogue designation only
🏛️Apollo: crosses Earth's orbit· +4
🧗Stony asteroid· +4
✨ Trivia
What makes it special
🎯It crosses our path. Its orbit genuinely intersects Earth's track around the Sun. The two paths cross; only the timing keeps them apart.
What it actually is
🛸Its orbit family. An Apollo-class object: its orbit is wider than Earth's but crosses it. Most known Earth-crossers belong to this family.
🌞Closest approach. At its nearest it comes within 0.93 AU of the Sun — inside the orbit of Earth.
🔁One lap. A single orbit around the Sun takes it about 3.5 years.
🥏How far it roams. Its orbit swings between 0.93 and 3.68 AU from the Sun.
Sense of scale
🧱Sense of scale. In everyday terms it is about 9.1 football pitches across.
Standing on it
🦘Don't jump. Escape velocity here is only around 0.58 m/s. A determined jump would launch you off it and into your own orbit around the Sun.
By the numbers
📐Estimated size. Nobody has measured its size directly. Assuming it reflects light like a typical asteroid, its brightness implies something roughly 956 metres across.
Properties
aphelion au
3.68
designation
136993
eccentricity
0.5954
full name
136993 (1998 ST49)
h mag
17.85
inclination
24.47
mean motion deg day
0.2809
moid au
0.0549
name
(136993) 1998 ST49
number only
yes
orbit class
APO
perihelion au
0.934
rotation period h
2.3017
semi major au
2.309
spec taxonomy
Q
spect
Q
About (136993) 1998 ST49
(136993) 1998 ST49 is a common neo. It has spectral type Q and swings within 0.934 AU of the Sun at perihelion.
Its orbit genuinely intersects Earth's track around the Sun. The two paths cross; only the timing keeps them apart.
How to see it
Like any astronomical target, (136993) 1998 ST49 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. Because it moves against the background stars, the live position panel on this page tracks where it is right now. The visibility panel above works out tonight's viewing window for your saved location.
Why (136993) 1998 ST49 is a common neo
(136993) 1998 ST49 scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.
That score comes from 5 science badges — Near-Earth object, Crosses Earth's orbit, Catalogue designation only, Apollo: crosses Earth's orbit and Stony asteroid — 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.