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Asteroid Near-Earth Potentially hazardous

87684

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87684 (2000 SY2)

Where is it now

Distance from Sun
0.307 AU
True anomaly
358.9°
Distance from Earth
1.295 AU
As of
11 October 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.

Sun Earth — 0.998 AU from the Sun Earth 87684 — 0.307 AU from the Sun 87684
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 87684 is 1.295 AU from Earth today (10.8 light-minutes).

In the sky

Right ascension
13h 26m 24s
Declination
-05° 17′ 42″
Constellation
Virgo
Distance from Earth
1.29 AU
Elongation from the Sun
4.55° — 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.

How do I find my coordinates?

Google Maps on a computer

  1. Right-click the spot where you'll be observing.
  2. The first line of the menu is the coordinates, e.g. 51.50722, -0.12758 — click it and they're copied.
  3. Paste them above.

Google Maps on a phone

  1. Press and hold the spot to drop a pin.
  2. The coordinates appear in the search bar (or on the pin's card) — tap to copy, then paste above.

A full Google Maps link works too, but the short maps.app.goo.gl share links don't carry coordinates — copy the numbers instead. We round to about a kilometre; that's all the sky calculation needs.

Know your what3words address? Paste it, e.g. ///filled.count.soap. This is optional — the three words are sent to what3words to convert them, and we don't store the address or the result.

Your location stays in your browser and is sent only for this calculation. Using a what3words address is optional; if you do, the three words go to what3words to be converted and we don't record them. Set a location first, then you can save an email alert for this object. See our privacy policy.

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
0.859 AU
Eccentricity
0.6427
Inclination
19.22°
Orbital period
290.6 days
Perihelion
0.307 AU
Aphelion
1.411 AU
Longitude of ascending node
162°
Argument of periapsis
47.81°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 18.2 LD
0.0468 AU
Tisserand (Jupiter)
6.648

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
2,531
Data arc
48.11 years
First observed
7 October 1977
Last observed
17 November 2025
Residual RMS
0.46 ″
Solution · Otto Matic
18 November 2025

Physical properties

Rotation period
2.57 hours

Visual & observation

Absolute magnitude (H)
15.96

Discovery & classification

Discovered by
LINEAR
Discovery date
20 September 2000
Discovery site
Socorro

Also known as 2000 SY2

Aten Near-Earth Object Potentially Hazardous Asteroid

Close approaches 101 on record

Flyby geometry
Ecliptic flyby of 87684 at 2027-09-17 00:27 UTC Top-down view of the ecliptic, Earth at the centre, for the 2027-09-17 00:27 UTC close approach of 87684. Catalogue miss distance 56.7 LD · 2.18 × 10⁷ km. The curve is the geocentric path from 2027-09-14 to 2027-09-20, 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. Sun 56.7 LD · 2.18 × 10⁷ km 2027-09-17 00:27 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2027-09-17 00:27 UTC close approach of 87684. Catalogue miss distance 56.7 LD · 2.18 × 10⁷ km. The curve is the geocentric path from 2027-09-14 to 2027-09-20, 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.

JPL Horizons

When (UTC) Body Distance Lunar distances Relative speed
2027-09-17 00:27:00 Earth 0.1458 AU 56.7 LD 25.4 km/s
2028-05-08 08:48:00 Mercury 0.0495 AU 19.3 LD 35.1 km/s
2028-05-08 08:48:00 Merc 0.0495 AU 19.3 LD 35.1 km/s
2031-08-22 14:22:00 Venus 0.1331 AU 51.8 LD 30.4 km/s
2031-09-13 01:10:00 Earth 0.0504 AU 19.6 LD 21.9 km/s
2035-09-10 15:34:00 Earth 0.1047 AU 40.7 LD 18.9 km/s
2038-09-12 00:15:00 Mercury 0.0828 AU 32.2 LD 45.8 km/s
2038-09-12 00:15:00 Merc 0.0828 AU 32.2 LD 45.8 km/s
2045-03-03 22:29:00 Venus 0.1114 AU 43.3 LD 28.8 km/s
2046-08-27 22:56:00 Merc 0.0488 AU 19.0 LD 35.2 km/s

Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.

Sources