2021 TF1 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.76 AU to 1.26 AU from the Sun; one orbit takes 372 days. Orbit from the JPL solution of 4 October 2021.
Where is it now
- Distance from Sun
- 1.02 AU
- True anomaly
- 253.89°
- Distance from Earth
- 0.59 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 56m 27s
- Declination
- -20° 30′ 10″
- Constellation
- Sagittarius
- Distance from Earth
- 0.59 AU
- Elongation from the Sun
- 75.5° — 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
- 1.012 AU
- Eccentricity
- 0.2469
- Inclination
- 26.1°
- Orbital period
- 372 days
- Perihelion
- 0.762 AU
- Aphelion
- 1.262 AU
- Longitude of ascending node
- 187.79°
- Argument of periapsis
- 285.52°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 5.4 LD
- 0.014 AU
- Tisserand (Jupiter)
- 5.908
Orbit quality
Orbit poorly determined (uncertainty code 7).
- Observations used
- 21
- Data arc
- 24 hours
- First observed
- 1 October 2021
- Last observed
- 2 October 2021
- Residual RMS
- 0.56 ″
- Solution · Otto Matic
- 4 October 2021
Visual & observation
- Absolute magnitude (H)
- 25.91
Discovery & classification
Close approaches 33 on record
Top-down view of the ecliptic, Earth at the centre, for the 2027-03-11 16:14 UTC close approach of 2021 TF1. Catalogue miss distance 105.1 LD · 4.04 × 10⁷ km. The curve is the geocentric path from 2027-03-08 to 2027-03-14, 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 |
|---|---|---|---|---|
| 2027-03-11 16:14:00 | Earth | 0.27 AU | 105.1 LD | 14.4 km/s |
| 2028-03-21 19:11:00 | Earth | 0.1743 AU | 67.8 LD | 14.5 km/s |
| 2029-03-30 21:53:00 | Earth | 0.1034 AU | 40.2 LD | 15.2 km/s |
| 2030-04-07 22:34:00 | Earth | 0.1211 AU | 47.1 LD | 16.6 km/s |
| 2031-04-15 09:02:00 | Earth | 0.2072 AU | 80.6 LD | 18.5 km/s |
| 2032-04-21 11:05:00 | Earth | 0.3095 AU | 120.4 LD | 20.8 km/s |
| 2033-04-28 04:29:00 | Earth | 0.4155 AU | 161.7 LD | 23.4 km/s |
| 2074-09-26 16:58:00 | Earth | 0.1815 AU | 70.6 LD | 18.1 km/s |
| 2075-09-30 16:15:00 | Earth | 0.0698 AU | 27.2 LD | 15.9 km/s |
| 2076-10-02 19:06:00 | Earth | 0.0446 AU | 17.4 LD | 14.3 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