2021 TJ10 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.82 AU to 1.2 AU from the Sun; one orbit takes 369.2 days. Orbit from the JPL solution of 11 October 2021.
Where is it now
- Distance from Sun
- 1.04 AU
- True anomaly
- 110.5°
- Distance from Earth
- 0.349 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
- 20h 49m 50s
- Declination
- -19° 28′ 54″
- Constellation
- Capricornus
- Distance from Earth
- 0.35 AU
- Elongation from the Sun
- 88.1° — well clear of the Sun
Favours the southern hemisphere; low or below the horizon from far north.
From your location
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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
- 1.007 AU
- Eccentricity
- 0.1873
- Inclination
- 5.68°
- Orbital period
- 369.2 days
- Perihelion
- 0.819 AU
- Aphelion
- 1.196 AU
- Longitude of ascending node
- 196.19°
- Argument of periapsis
- 75.09°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 3.6 LD
- 0.0093 AU
- Tisserand (Jupiter)
- 6.026
Orbit quality
Orbit poorly determined (uncertainty code 6).
- Observations used
- 14
- Data arc
- 2 days
- First observed
- 9 October 2021
- Last observed
- 11 October 2021
- Residual RMS
- 0.64 ″
- Solution · Otto Matic
- 11 October 2021
Visual & observation
- Absolute magnitude (H)
- 28.98
Discovery & classification
Close approaches 123 on record
Top-down view of the ecliptic, Earth at the centre, for the 2027-10-18 21:43 UTC close approach of 2021 TJ10. Catalogue miss distance 143.3 LD · 5.51 × 10⁷ km. The curve is the geocentric path from 2027-10-15 to 2027-10-21, 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 |
|---|---|---|---|---|
| 2026-10-15 22:25:00 | Earth | 0.3026 AU | 117.8 LD | 15.5 km/s |
| 2027-10-18 21:43:00 | Earth | 0.3682 AU | 143.3 LD | 17.4 km/s |
| 2028-10-20 19:41:00 | Earth | 0.4342 AU | 169.0 LD | 19.5 km/s |
| 2029-10-23 21:12:00 | Earth | 0.4996 AU | 194.4 LD | 21.4 km/s |
| 2080-01-26 12:03:00 | Venus | 0.1384 AU | 53.9 LD | 4.7 km/s |
| 2094-03-19 14:16:00 | Venus | 0.1476 AU | 57.5 LD | 4.8 km/s |
| 2098-02-26 06:07:00 | Earth | 0.4654 AU | 181.1 LD | 20.4 km/s |
| 2099-03-01 09:52:00 | Earth | 0.3988 AU | 155.2 LD | 18.4 km/s |
| 2100-03-04 13:48:00 | Earth | 0.3324 AU | 129.3 LD | 16.4 km/s |
| 2101-03-07 17:34:00 | Earth | 0.2665 AU | 103.7 LD | 14.4 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