2021 TC1 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.76 AU to 1.25 AU from the Sun; one orbit takes 368.1 days. Orbit from the JPL solution of 27 September 2022.
Where is it now
- Distance from Sun
- 0.966 AU
- True anomaly
- 264.63°
- Distance from Earth
- 0.251 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 54m 51s
- Declination
- -13° 25′ 47″
- Constellation
- Sagittarius
- Distance from Earth
- 0.25 AU
- Elongation from the Sun
- 76.8° — 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
- 1.005 AU
- Eccentricity
- 0.2465
- Inclination
- 2.32°
- Orbital period
- 368.1 days
- Perihelion
- 0.757 AU
- Aphelion
- 1.253 AU
- Longitude of ascending node
- 260.92°
- Argument of periapsis
- 221.23°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 8.7 LD
- 0.0225 AU
- Tisserand (Jupiter)
- 6.028
Orbit quality
Orbit very well determined (uncertainty code 2).
- Observations used
- 45
- Data arc
- 359 days
- First observed
- 3 October 2021
- Last observed
- 27 September 2022
- Residual RMS
- 0.59 ″
- Solution · Otto Matic
- 27 September 2022
Visual & observation
- Absolute magnitude (H)
- 25.34
Discovery & classification
Close approaches 158 on record
Top-down view of the ecliptic, Earth at the centre, for the 2026-12-11 01:42 UTC close approach of 2021 TC1. Catalogue miss distance 73.9 LD · 2.84 × 10⁷ km. The curve is the geocentric path from 2026-12-08 to 2026-12-14, 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 |
|---|---|---|---|---|
| 2026-12-11 01:42:00 | Earth | 0.19 AU | 73.9 LD | 6.4 km/s |
| 2027-08-26 07:51:00 | Earth | 0.2109 AU | 82.1 LD | 5.7 km/s |
| 2027-12-22 07:42:00 | Earth | 0.2055 AU | 80.0 LD | 7.1 km/s |
| 2028-08-16 23:29:00 | Earth | 0.2243 AU | 87.3 LD | 6 km/s |
| 2028-12-31 18:25:00 | Earth | 0.2165 AU | 84.3 LD | 7.6 km/s |
| 2029-08-09 03:12:00 | Earth | 0.2333 AU | 90.8 LD | 6.2 km/s |
| 2030-01-09 18:59:00 | Venus | 0.0797 AU | 31.0 LD | 4.2 km/s |
| 2030-01-10 15:52:00 | Earth | 0.2238 AU | 87.1 LD | 7.9 km/s |
| 2030-08-01 06:46:00 | Earth | 0.2394 AU | 93.2 LD | 6.3 km/s |
| 2031-01-21 03:49:00 | Earth | 0.2276 AU | 88.6 LD | 8 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