When does 1999 AN10 pass Earth?
1999 AN10: closest approach August 2027
1999 AN10 passes Earth on August 7, 2027 at 07:10 UTC, 389,855 km from Earth's centre (1.0 lunar distances).
Distance through the flyby
lunar distances, ±12 h (JPL Horizons)Can you see it?
JPL Horizons gives a brightest apparent magnitude of 7.5 as seen from Earth's centre, at 09:01 UTC on Aug 7, 2027: a binocular object. At closest approach it is overhead at about 19°N, 39°W, where the Sun is below the horizon. Seen from the ground, its position and brightness differ from the geocentric values, the more so the closer it comes.
Impact risk
1999 AN10 is not on JPL's Sentry impact-monitoring list: no possible impact has been found for it.
Physical data
| Absolute magnitude H | 18.05 |
| Rotation period | 5.041 h |
| Orbit class | Apollo |
| Potentially hazardous asteroid (PHA) | yes |
JPL Small-Body Database: 137108 (1999 AN10).
Every close approach, 1900–2200
All passes within 0.2 au (78 lunar distances) computed by JPL. None comes closer than the 2027 pass. The uncertainty column is JPL's 3-sigma timing uncertainty; it grows for dates far from today.
| Date | Lunar dist. | Distance | km/s | Time ± |
|---|---|---|---|---|
| Aug 1, 1932 | 50.8 | 19.52 million km | 23.9 | 00:13 |
| Aug 5, 1939 | 18.4 | 7.07 million km | 25.4 | 00:09 |
| Aug 7, 1946 | 2.4 | 935,115 km | 26.4 | < 00:01 |
| Jan 30, 1948 | 44.6 | 17.13 million km | 29.2 | < 00:01 |
| Feb 8, 1955 | 47.7 | 18.34 million km | 24.5 | < 00:01 |
| Aug 8, 1990 | 9.9 | 3.80 million km | 26.8 | < 00:01 |
| Jan 31, 1992 | 33.6 | 12.91 million km | 28.6 | < 00:01 |
| Feb 11, 1999 | 75.8 | 29.14 million km | 23.3 | < 00:01 |
| Aug 7, 2027 | 1.0 | 389,855 km | 26.3 | < 00:01 |
| Jul 30, 2034 | 69.9 | 26.88 million km | 23.1 | 00:08 |
| Feb 4, 2076 | 10.4 | 3.99 million km | 26.3 | 00:48 |
| Aug 11, 2081 | 37.8 | 14.54 million km | 28.3 | 00:03 |
| Jan 29, 2083 | 42.9 | 16.49 million km | 29.1 | 00:11 |
| Aug 5, 2088 | 13.5 | 5.19 million km | 25.6 | 00:55 |
| Feb 6, 2137 | 21.5 | 8.28 million km | 25.7 | 00:45 |
| Aug 13, 2142 | 44.6 | 17.14 million km | 28.7 | 00:29 |
| Jan 31, 2144 | 37.2 | 14.29 million km | 28.8 | 00:23 |
| Aug 6, 2149 | 12.5 | 4.79 million km | 25.7 | 00:01 |
| Feb 9, 2191 | 47.4 | 18.21 million km | 24.5 | 02:48 |
| Aug 14, 2196 | 59.4 | 22.85 million km | 29.5 | 03:02 |
| Feb 1, 2198 | 25.4 | 9.78 million km | 28.1 | 03:00 |
Questions
Will 1999 AN10 hit Earth?
1999 AN10 is not on JPL's Sentry impact-monitoring list: no possible impact has been found for it.
How close will 1999 AN10 come?
389,855 km from Earth's centre, 383,484 km above the surface, on Aug 7, 2027 at 07:10 UTC (NASA JPL).
How big is 1999 AN10?
650–1.5 km (estimated from H = 18.05). Its rotation period is 5.041 hours.
Can I see 1999 AN10?
At its brightest about magnitude 7.5 (JPL Horizons, geocentric): a binocular object.
Sources: NASA/JPL CNEOS close-approach data, Sentry, Small-Body Database and Horizons (geocentric ephemeris). Data fetched 30 Oct 2026, 00:24 UTC; refreshed weekly. Times converted from TDB to UTC.