2021 TB15 is an asteroid in the Aten orbit class. Its orbit takes it from 0.75 AU to 1.22 AU from the Sun; one orbit takes 356.9 days. Orbit from the JPL solution of 20 October 2022.
Where is it now
- Distance from Sun
- 1 AU
- True anomaly
- 252.74°
- Distance from Earth
- 0.53 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
- 11h 24m 57s
- Declination
- +46° 54′ 47″
- Constellation
- Ursa Major
- Distance from Earth
- 0.53 AU
- Elongation from the Sun
- 75.08° — well clear of the Sun
Favours the northern hemisphere; low or below the horizon from far south.
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
- 0.985 AU
- Eccentricity
- 0.2377
- Inclination
- 29.51°
- Orbital period
- 356.9 days
- Perihelion
- 0.751 AU
- Aphelion
- 1.219 AU
- Longitude of ascending node
- 26.54°
- Argument of periapsis
- 149.49°
- Epoch · J2000
- 2461200.5
- Orbit class · ATE
- Aten
- Earth MOID · 63.5 LD
- 0.1632 AU
- Tisserand (Jupiter)
- 6.019
Orbit quality
Orbit very well determined (uncertainty code 1).
- Observations used
- 56
- Data arc
- 2.98 years
- First observed
- 29 October 2019
- Last observed
- 20 October 2022
- Residual RMS
- 0.67 ″
- Solution · Otto Matic
- 20 October 2022
Visual & observation
- Absolute magnitude (H)
- 23.32
Discovery & classification
Close approaches 143 on record
Top-down view of the ecliptic, Earth at the centre, for the 2058-06-01 14:29 UTC close approach of 2021 TB15. Catalogue miss distance 164.7 LD · 6.33 × 10⁷ km. The curve is the geocentric path from 2058-05-29 to 2058-06-04, 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 |
|---|---|---|---|---|
| 2027-02-04 19:06:00 | Venus | 0.0729 AU | 28.4 LD | 17.4 km/s |
| 2043-09-15 21:18:00 | Venus | 0.0675 AU | 26.3 LD | 17.4 km/s |
| 2058-06-01 14:29:00 | Earth | 0.4232 AU | 164.7 LD | 21.1 km/s |
| 2059-05-19 18:33:00 | Earth | 0.3339 AU | 129.9 LD | 19.9 km/s |
| 2059-09-22 19:11:00 | Earth | 0.4888 AU | 190.2 LD | 15.5 km/s |
| 2060-04-24 21:07:00 | Venus | 0.0949 AU | 36.9 LD | 17.4 km/s |
| 2060-05-06 00:09:00 | Earth | 0.2635 AU | 102.5 LD | 19.1 km/s |
| 2060-10-01 11:45:00 | Earth | 0.4144 AU | 161.3 LD | 15.3 km/s |
| 2061-04-23 00:25:00 | Earth | 0.2301 AU | 89.5 LD | 18.7 km/s |
| 2061-10-09 07:23:00 | Earth | 0.337 AU | 131.2 LD | 15.1 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