2021 TS10 is an asteroid in the Apollo orbit class. Its orbit takes it from 1 AU to 1.04 AU from the Sun; one orbit takes 377.3 days. Orbit from the JPL solution of 15 February 2022.
Where is it now
- Distance from Sun
- 1.033 AU
- True anomaly
- 124.88°
- Distance from Earth
- 0.959 AU
- As of
- 3 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
- 19h 12m 15s
- Declination
- -32° 30′ 26″
- Constellation
- Sagittarius
- Distance from Earth
- 0.96 AU
- Elongation from the Sun
- 63.93° — well clear of the Sun
Favours the southern hemisphere; low or below the horizon from far north.
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
- 1.022 AU
- Eccentricity
- 0.0196
- Inclination
- 16.33°
- Orbital period
- 377.3 days
- Perihelion
- 1.002 AU
- Aphelion
- 1.042 AU
- Longitude of ascending node
- 19.9°
- Argument of periapsis
- 199.48°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 0.5 LD
- 0.0014 AU
- Tisserand (Jupiter)
- 5.943
Orbit quality
Orbit poorly determined (uncertainty code 6).
- Observations used
- 77
- Data arc
- 8 days
- First observed
- 10 October 2021
- Last observed
- 18 October 2021
- Residual RMS
- 0.5 ″
- Solution · Otto Matic
- 15 February 2022
Visual & observation
- Absolute magnitude (H)
- 25.58
Discovery & classification
Listed by JPL impact monitoring; see the Sentry table for current probabilities.
Close approaches 36 on record
Top-down view of the ecliptic, Earth at the centre, for the 2051-03-30 01:20 UTC close approach of 2021 TS10. Catalogue miss distance 131.9 LD · 5.07 × 10⁷ km. The curve is the geocentric path from 2051-03-27 to 2051-04-02, 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. 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 |
|---|---|---|---|---|
| 2051-03-30 01:20:00 | Earth | 0.3388 AU | 131.9 LD | 13.7 km/s |
| 2051-10-23 02:00:00 | Earth | 0.317 AU | 123.4 LD | 11.5 km/s |
| 2052-04-04 22:13:00 | Earth | 0.1379 AU | 53.7 LD | 9.7 km/s |
| 2052-10-15 12:07:00 | Earth | 0.1326 AU | 51.6 LD | 8.9 km/s |
| 2053-04-12 01:49:00 | Earth | 0.0588 AU | 22.9 LD | 8.6 km/s |
| 2053-10-11 07:04:00 | Earth | 0.0769 AU | 29.9 LD | 8.8 km/s |
| 2054-04-20 01:55:00 | Earth | 0.2625 AU | 102.2 LD | 11.1 km/s |
| 2054-10-08 09:07:00 | Earth | 0.2652 AU | 103.2 LD | 11.6 km/s |
| 2055-04-28 17:57:00 | Earth | 0.4683 AU | 182.2 LD | 15.6 km/s |
| 2055-10-07 01:42:00 | Earth | 0.4622 AU | 179.9 LD | 16 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