2001 XX4 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.45 AU to 1.57 AU from the Sun; one orbit takes 368.9 days. Orbit from the JPL solution of 14 April 2021.
Where is it now
- Distance from Sun
- 1.07 AU
- True anomaly
- 230.96°
- Distance from Earth
- 1.958 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
- 13h 23m 48s
- Declination
- -08° 23′ 18″
- Constellation
- Virgo
- Distance from Earth
- 1.96 AU
- Elongation from the Sun
- 18.96° — too close to the Sun to observe
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
- 1.007 AU
- Eccentricity
- 0.5569
- Inclination
- 0.85°
- Orbital period
- 368.9 days
- Perihelion
- 0.446 AU
- Aphelion
- 1.567 AU
- Longitude of ascending node
- 127.09°
- Argument of periapsis
- 186.8°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 4.4 LD
- 0.0113 AU
- Tisserand (Jupiter)
- 5.9
Orbit quality
Orbit very well determined (uncertainty code 1).
- Observations used
- 102
- Data arc
- 388 days
- First observed
- 11 December 2001
- Last observed
- 3 January 2003
- Residual RMS
- 0.56 ″
- Solution · Otto Matic
- 14 April 2021
Visual & observation
- Absolute magnitude (H)
- 22.1
Discovery & classification
Close approaches 250 on record
Top-down view of the ecliptic, Earth at the centre, for the 2055-03-14 13:02 UTC close approach of 2001 XX4. Catalogue miss distance 172.5 LD · 6.63 × 10⁷ km. The curve is the geocentric path from 2055-03-11 to 2055-03-17, 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 |
|---|---|---|---|---|
| 2026-12-28 07:57:00 | Merc | 0.0563 AU | 21.9 LD | 17.8 km/s |
| 2026-12-28 07:57:00 | Mercury | 0.0563 AU | 21.9 LD | 17.8 km/s |
| 2031-02-24 11:06:00 | Venus | 0.0126 AU | 4.9 LD | 20.6 km/s |
| 2032-01-14 05:45:00 | Mercury | 0.0991 AU | 38.6 LD | 24.4 km/s |
| 2032-01-14 05:45:00 | Merc | 0.0991 AU | 38.6 LD | 24.4 km/s |
| 2040-01-27 16:13:00 | Venus | 0.1224 AU | 47.6 LD | 14.4 km/s |
| 2045-04-21 14:26:00 | Venus | 0.0549 AU | 21.4 LD | 22.8 km/s |
| 2055-03-14 13:02:00 | Earth | 0.4433 AU | 172.5 LD | 31.9 km/s |
| 2056-03-16 21:10:00 | Earth | 0.3747 AU | 145.8 LD | 29.7 km/s |
| 2057-03-20 03:41:00 | Earth | 0.3055 AU | 118.9 LD | 27.4 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