2021 TK13 is an asteroid in the Aten orbit class. Its orbit takes it from 0.83 AU to 1.14 AU from the Sun; one orbit takes 356.8 days. Orbit from the JPL solution of 14 January 2026.
Where is it now
- Distance from Sun
- 1.14 AU
- True anomaly
- 181.78°
- Distance from Earth
- 0.495 AU
- As of
- 2 November 2026
Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.
In the sky
- Right ascension
- 08h 29m 41s
- Declination
- +13° 02′ 38″
- Constellation
- Cancer
- Distance from Earth
- 0.49 AU
- Elongation from the Sun
- 94.33° — well clear of the Sun
Visible from both hemispheres.
From your location
See how high it is right now, whether it is up after civil twilight, and when it rises and sets where you are.
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Two-body approximation, good to about a degree for the planets — enough to find the constellation and know whether it is up.
Orbital elements
- Semi-major axis
- 0.984 AU
- Eccentricity
- 0.1582
- Inclination
- 5.17°
- Orbital period
- 356.8 days
- Perihelion
- 0.829 AU
- Aphelion
- 1.14 AU
- Longitude of ascending node
- 217.51°
- Argument of periapsis
- 26.65°
- Epoch · J2000
- 2461200.5
- Orbit class · ATE
- Aten
- Earth MOID · 24.1 LD
- 0.0618 AU
- Tisserand (Jupiter)
- 6.141
Orbit quality
Orbit very well determined (uncertainty code 1).
- Observations used
- 49
- Data arc
- 4.28 years
- First observed
- 3 October 2021
- Last observed
- 14 January 2026
- Residual RMS
- 0.71 ″
- Solution · Otto Matic
- 14 January 2026
Visual & observation
- Absolute magnitude (H)
- 25.41
Discovery & classification
Close approaches 97 on record
Top-down view of the ecliptic, Earth at the centre, for the 2027-02-10 18:41 UTC close approach of 2021 TK13. Catalogue miss distance 66.6 LD · 2.56 × 10⁷ km. The curve is the geocentric path from 2027-02-07 to 2027-02-13, with a mark at UTC midnights and an arrow for the direction of motion. The circle is the Moon’s mean orbit; the Moon is plotted at closest approach. A ray shows the Sun’s direction. The labelled distance is the full separation. The drawn radius is the part that lies in the ecliptic plane. At closest approach the object is south of the ecliptic. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate.
| When (UTC) | Body | Distance | Lunar distances | Relative speed |
|---|---|---|---|---|
| 2027-02-10 18:41:00 | Earth | 0.171 AU | 66.6 LD | 9.7 km/s |
| 2030-04-02 11:15:00 | Venus | 0.1092 AU | 42.5 LD | 5 km/s |
| 2058-07-13 15:28:00 | Venus | 0.1115 AU | 43.4 LD | 4.9 km/s |
| 2061-09-21 20:05:00 | Earth | 0.159 AU | 61.9 LD | 9.6 km/s |
| 2062-09-21 19:39:00 | Earth | 0.0617 AU | 24.0 LD | 5.6 km/s |
| 2063-08-04 08:20:00 | Earth | 0.1559 AU | 60.7 LD | 3.5 km/s |
| 2063-10-20 17:40:00 | Earth | 0.1182 AU | 46.0 LD | 4.6 km/s |
| 2064-06-18 20:12:00 | Earth | 0.1892 AU | 73.6 LD | 5.9 km/s |
| 2064-11-21 16:08:00 | Earth | 0.158 AU | 61.5 LD | 5.1 km/s |
| 2065-05-17 10:26:00 | Earth | 0.1839 AU | 71.6 LD | 6.3 km/s |
Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.
Sources
- visual properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB