Near-Earth asteroid

2102 Tantalus (1975 YA)

2102 Tantalus (1975 YA) is a near-Earth asteroid with an estimated diameter of 1.7–3.8 km (1.0–2.3 mi), in the APO orbit class. Its next listed approach within 0.2 au is on December 27, 2038. NASA classifies it as potentially hazardous.

Potentially hazardous

1.7–3.8 km

Estimated diameter

15.99

Absolute magnitude (H)

Approaches within 0.2 au, 1900–2200

Upcoming close approaches to Earth

8 approaches within 0.2 au (about 30 million km) are calculated from now to 2200. The closest in the 1900–2200 record is on December 28, 2186 at about 5,529,137 km.

Future Earth approaches (JPL Close Approach Data)
Date (TDB)	Nominal distance km	Lunar dist.	Speed km/s	Time uncertainty
2038-Dec-27 07:34	6,642,145	17.3	33.43	< 00:01
2060-Dec-23 07:04	14,831,133	38.6	34.28	< 00:01
2080-Jan-02 02:57	26,917,145	70.0	32.62	< 00:01
2101-Dec-29 20:23	10,539,170	27.4	33.16	< 00:01
2123-Dec-27 06:36	7,795,545	20.3	33.82	< 00:01
2145-Dec-22 14:41	23,621,504	61.5	34.94	< 00:01
2164-Dec-31 14:58	17,268,082	44.9	32.91	< 00:01
2186-Dec-28 09:07	5,529,137	14.4	33.61	< 00:01

Orbit

Orbit class: APO — Near-Earth asteroid orbits which cross the Earth’s orbit similar to that of 1862 Apollo
Orbital period: 535.2 days (1.47 years)
Minimum orbit intersection distance: 0.04255 au (6,365,389 km)
Observed: January 2, 1976 to August 8, 2026

Recent past approaches

Past Earth approaches within 0.2 au since 1900 (JPL), most recent 6
Date (TDB)	Distance km	Lunar dist.	Speed km/s
2016-Dec-30 14:32	20,566,715	53.5	32.76
1997-Dec-21 20:09	20,622,066	53.6	34.64
1975-Dec-26 08:15	7,004,172	18.2	33.6
1953-Dec-29 06:18	15,214,103	39.6	32.93
1934-Dec-20 07:33	26,742,115	69.6	35.04
1912-Dec-23 20:32	10,980,484	28.6	33.9

← All asteroids passing Earth this week

Sources

Size, hazard status and this week’s approach — NASA NeoWs (copy taken Oct 28, 2026, 2:39 AM EDT)
Close-approach list — JPL SBDB Close Approach Data API (copy taken Oct 28, 2026, 2:39 AM EDT)
Full orbit details — JPL Small-Body Database: 2102 Tantalus (1975 YA)

Distances are nominal predictions and can change with new observations. OpenOrbit is not affiliated with or endorsed by NASA or JPL.