2021 EY1 is an asteroid in the Aten orbit class. Its orbit takes it from 0.54 AU to 1.45 AU from the Sun; one orbit takes 362.8 days. Orbit from the JPL solution of 15 May 2021.
Where is it now
- Distance from Sun
- 1.449 AU
- True anomaly
- 179.96°
- Distance from Earth
- 1.405 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
- 09h 56m 33s
- Declination
- +06° 53′ 36″
- Constellation
- Leo
- Distance from Earth
- 1.4 AU
- Elongation from the Sun
- 72.42° — 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
- 0.995 AU
- Eccentricity
- 0.4553
- Inclination
- 6.02°
- Orbital period
- 362.8 days
- Perihelion
- 0.542 AU
- Aphelion
- 1.449 AU
- Longitude of ascending node
- 165.96°
- Argument of periapsis
- 121.5°
- Epoch · J2000
- 2461200.5
- Orbit class · ATE
- Aten
- Earth MOID · 3.2 LD
- 0.0083 AU
- Tisserand (Jupiter)
- 6.002
Orbit quality
Orbit poorly determined (uncertainty code 7).
- Observations used
- 29
- Data arc
- 24 hours
- First observed
- 7 March 2021
- Last observed
- 8 March 2021
- Residual RMS
- 0.34 ″
- Solution · Otto Matic
- 15 May 2021
Visual & observation
- Absolute magnitude (H)
- 26.68
Discovery & classification
Close approaches 256 on record
Top-down view of the ecliptic, Earth at the centre, for the 2027-03-04 04:26 UTC close approach of 2021 EY1. Catalogue miss distance 81.1 LD · 3.12 × 10⁷ km. The curve is the geocentric path from 2027-03-01 to 2027-03-07, 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 |
|---|---|---|---|---|
| 2027-03-04 04:26:00 | Earth | 0.2083 AU | 81.1 LD | 21.1 km/s |
| 2028-03-01 18:27:00 | Earth | 0.2498 AU | 97.2 LD | 22.4 km/s |
| 2029-02-28 06:51:00 | Earth | 0.2914 AU | 113.4 LD | 23.7 km/s |
| 2030-02-26 19:11:00 | Earth | 0.333 AU | 129.6 LD | 25 km/s |
| 2031-02-25 07:16:00 | Earth | 0.374 AU | 145.6 LD | 26.3 km/s |
| 2032-02-23 18:35:00 | Earth | 0.4149 AU | 161.5 LD | 27.6 km/s |
| 2033-02-21 06:00:00 | Earth | 0.4559 AU | 177.4 LD | 29 km/s |
| 2034-02-19 17:30:00 | Earth | 0.4967 AU | 193.3 LD | 30.3 km/s |
| 2053-03-29 19:33:00 | Venus | 0.1302 AU | 50.7 LD | 21.9 km/s |
| 2056-01-20 13:57:00 | Venus | 0.1103 AU | 42.9 LD | 11.1 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